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Summary of Significant Accounting and Reporting Policies (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 48 Months Ended |  |  |  |  |  |  |
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Jun. 30, 2019 USD ($) MW | Jan. 01, 2018 USD ($) | Jan. 01, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jan. 31, 2017 USD ($) | Feb. 16, 2018 USD ($) | Dec. 31, 2017 USD ($) MW | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) MW | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) unit project $ / shares MW shares | Dec. 31, 2016 USD ($) MW | Dec. 31, 2015 USD ($) MW | Dec. 31, 2020 USD ($) kWh $ / kW MW | Dec. 31, 2016 USD ($) MW | Dec. 31, 2019 MW | Mar. 31, 2018 MW | Jan. 31, 2018 MW | Oct. 30, 2016 | Jul. 29, 2016 USD ($) | Oct. 31, 2015 USD ($) | Jul. 01, 2014
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate number of customer accounts |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit Sharing Liability, net of Amortization |  |  |  |  |  |  | $ 866,000,000 |  |  |  | $ 757,000,000 |  |  |  | $ 866,000,000 |  | $ 757,000,000 |  |  |  |  | $ 757,000,000 |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible ITCs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000,000 |  | 2,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible ITCs included in other receivables |  |  |  |  |  |  | 138,000,000 |  |  |  | 289,000,000 |  |  |  | 138,000,000 |  | 289,000,000 |  |  |  |  | 289,000,000 |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  | 2,155,000,000 | $ 847,000,000 | $ 793,000,000 | $ 1,583,000,000 | 966,000,000 | $ 753,000,000 | $ 540,000,000 | $ 653,000,000 | 5,378,000,000 |  | 2,912,000,000 |  | $ 2,752,000,000 |  |  |  |  |  |  |  |  |  |
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation |  |  |  |  |  |  | 3,031,000,000 |  |  |  | 2,736,000,000 |  |  |  | 3,031,000,000 |  | 2,736,000,000 |  | 2,469,000,000 |  |  | 2,736,000,000 |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  | 269,000,000 |  |  |  | 237,000,000 |  |  |  | 269,000,000 |  | 237,000,000 |  |  |  |  | 237,000,000 |  |  |  |  |  |  |
restricted cash related to margin cash collateral that is netted against derivative instruments |  |  |  |  |  |  | 83,000,000 |  |  |  |  |  |  |  | 83,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules |  |  |  |  |  |  | 4,213,000,000 |  |  |  | 289,000,000 |  |  |  | 4,213,000,000 |  | 289,000,000 |  |  |  |  | 289,000,000 |  |  |  |  |  |  |
Unrecognized tax benefits that impact annual effective income tax rate |  |  |  |  |  |  | 71,000,000 |  |  |  |  |  |  |  | 71,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | 18,992,000,000 |  |  |  | 15,458,000,000 |  |  |  | 18,992,000,000 |  | 15,458,000,000 |  |  |  |  | 15,458,000,000 |  |  |  |  |  |  |
FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues and Rates [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled Receivables, Current |  |  |  |  |  |  | $ 423,000,000 |  |  |  | 261,000,000 |  |  |  | 423,000,000 |  | 261,000,000 |  |  |  |  | 261,000,000 |  |  |  |  |  |  |
Franchise fees and gross receipts taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 767,000,000 |  | 700,000,000 |  | 722,000,000 |  |  |  |  |  |  |  |  |  |
Surcharges related to storm-recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 393,000,000 |  | 119,000,000 |  | 115,000,000 |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in base rate revenues |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |
Regulatory return on common equity (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |
Original Reserve Amount That May Be Amortized Under the 2012 Rate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Regulatory return on common equity range (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.50% |  |  |  |  |  |  |
Percentage of Certain Gains Received by Customers From Base Rate Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of electric generating assets to gross investment in electric utility plant in service (in hundredths) |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of electric transmission assets to gross investment in electric utility plant in service (in hundredths) |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of electric distribution assets to gross investment in electric utility plant in service (in hundredths) |  |  |  |  |  |  | 34.00% |  |  |  |  |  |  |  | 34.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of general facilities assets to gross investment in electric utility plant in service (in hundredths) |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible ITCs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000,000 |  | 147,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum interval between depreciation studies performed and filed with the FPSC (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of reserve (reversal) amortization recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |  | $ 13,000,000 |  | $ (15,000,000) |  |  |  |  |  |  |  |  |  |
FPL's composite depreciation rate for electric plant in service (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  | 3.40% |  | 3.30% |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  | $ 344,000,000 | $ 566,000,000 | $ 526,000,000 | $ 445,000,000 | 371,000,000 | $ 515,000,000 | $ 448,000,000 | $ 393,000,000 | $ 1,880,000,000 | [1] | $ 1,727,000,000 | [1] | $ 1,648,000,000 | [1] |  |  |  |  |  |  |  |  |
Construction Activity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold of plant in service balance at which AFUDC may be recorded (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFUDC capitalization rate for FPL (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.16% |  | 6.34% |  | 6.34% |  |  |  |  |  |  |  |  |  |
AFUDC capitalized for FPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,000,000 |  | $ 97,000,000 |  | $ 88,000,000 |  |  |  |  |  |  |  |  |  |
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum interval between nuclear decommissioning studies submitted to the FPSC for approval (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
For FPL, number of nuclear units | unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPL's portion of the ultimate costs of nuclear decommissioning |  |  |  |  |  |  | 7,500,000,000 |  |  |  |  |  |  |  | $ 7,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPL's Ultimate costs of nuclear decommissioning, in current year dollars |  |  |  |  |  |  | 3,100,000,000 |  |  |  |  |  |  |  | 3,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPL's fund earnings on decommissioning funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,000,000 |  | 102,000,000 |  | 96,000,000 |  |  |  |  |  |  |  |  |  |
Maximum interval between plant dismantlement studies submitted to the FPSC for approval (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant Dismantlement Approved Expense Prior Dismantlement Study |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant Dismantlement Approved Expense Effective January 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ultimate Costs Of Plant Dismantlement |  |  |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ultimate Costs Of Plant Dismantlement In Current Year Dollars |  |  |  |  |  |  | 497,000,000 |  |  |  |  |  |  |  | 497,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation |  |  |  |  |  |  | 2,047,000,000 |  |  |  | 1,919,000,000 |  |  |  | 2,047,000,000 |  | 1,919,000,000 |  | 1,822,000,000 |  |  | $ 1,919,000,000 |  |  |  |  |  |  |
Major Maintenance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Costs and Other Assets, Nuclear Maintenance Costs |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liability for nuclear maintenance costs |  |  |  |  |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  | 65,000,000 |  |  |  |  | 65,000,000 |  |  |  |  |  |  |
Nuclear maintenance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,000,000 |  | 89,000,000 |  | 90,000,000 |  |  |  |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  | 141,000,000 |  |  |  | 120,000,000 |  |  |  | 141,000,000 |  | 120,000,000 |  |  |  |  | 120,000,000 |  |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules |  |  |  |  |  |  | 4,180,000,000 |  |  |  | 266,000,000 |  |  |  | 4,180,000,000 |  | 266,000,000 |  |  |  |  | 266,000,000 |  |  |  |  |  |  |
Accumulated Deferred Investment Tax Credit |  |  |  |  |  |  | 119,000,000 |  |  |  | 123,000,000 |  |  |  | 119,000,000 |  | 123,000,000 |  |  |  |  | 123,000,000 |  |  |  |  |  |  |
Deferred income tax benefit associated with convertible ITCs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,000,000 |  | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | 7,376,000,000 |  |  |  | 6,875,000,000 |  |  |  | 7,376,000,000 |  | 6,875,000,000 |  |  |  |  | 6,875,000,000 |  |  |  |  |  |  |
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, proceeds from recovery of storm restoration costs |  |  |  | $ 201,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible storm restoration costs |  |  |  | 294,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm and property insurance reserve prior to Hurricane Hermine and Hurricane Matthew |  |  |  | 93,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount approved to replenish reserve amount |  |  |  | $ 117,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, provision for storm insurance reserve |  |  |  |  |  |  | 74,000,000 |  |  |  |  |  |  |  | 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm Restoration Costs |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
NEP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects | project |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW |  |  |  |  |  |  | 3,728 |  |  |  |  |  |  |  | 3,728 |  |  |  |  |  |  |  |  |  |  |  |  |  |
NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value of assets serving as collateral |  |  |  |  |  |  | $ 15,600,000,000 |  |  |  |  |  |  |  | $ 15,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Activity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project development costs of NextEra Energy Resources |  |  |  |  |  |  | $ 433,000,000 |  |  |  | 193,000,000 |  |  |  | 433,000,000 |  | 193,000,000 |  |  |  |  | 193,000,000 |  |  |  |  |  |  |
Interest capitalized on construction projects of NextEra Energy Resources |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 89,000,000 |  | 107,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Deemed capital structure of NextEra Energy Resources (in hundredths) |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation |  |  |  |  |  |  | $ 984,000,000 |  |  |  | 817,000,000 |  |  |  | $ 984,000,000 |  | 817,000,000 |  | 647,000,000 |  |  | 817,000,000 |  |  |  |  |  |  |
Ultimate Costs Of Nuclear Decommissioning For Wholly Owned Indirect Subsidiary |  |  |  |  |  |  | 10,800,000,000 |  |  |  |  |  |  |  | 10,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ultimate Costs Of Nuclear Decommissioning In Current Year Dollars For Wholly Owned Indirect Subsidiary |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ultimate costs to dismantle wind and solar facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective period for Seabrook's decommissioning funding plan (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Major Maintenance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized major maintenance costs |  |  |  |  |  |  | $ 79,000,000 |  |  |  | $ 69,000,000 |  |  |  | $ 79,000,000 |  | 69,000,000 |  |  |  |  | $ 69,000,000 |  |  |  |  |  |  |
Major maintenance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  | $ 74,000,000 |  | $ 79,000,000 |  |  |  |  |  |  |  |  |  |
NEER [Member] | Variable Interest Entities Wind Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind Electric Generating Facility Capability | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |
NEER [Member] | Photovoltaic Solar Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar generating facility capability | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 374 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in base rate revenues | $ 200,000,000 | $ 211,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW | 1,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  | 300 | 300 |  |  |  |  |
Regulatory return on common equity (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.55% |  |  |  |  |  |  |  |
Earned regulatory ROE threshold below which retail base rate relief may be sought (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |
Earned regulatory ROE threshold above which retail base rate reduction may be sought (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.60% |  |  |  |  |  |  |  |
Installed solar cost cap, per kilowatt | $ / kW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,750 |  |  |  |  |  |  |  |
Maximum Amount Of Depreciation Reserve That May Be Amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Reserve amount remaining under 2012 rate agreement that may be amortized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
Maximum Storm Surcharge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Threshold Of Storm Restoration Costs In Any Given Calendar Year At Which Surcharge May Be Increased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000,000 |  |  |  |  |  |  |  |
Threshold Of Storm Restoration Costs In Any Given Calendar Year At Which Surcharge May Be Increased, Amount Above Which May Be Recovered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Increment Of Usage In Kwh On Which Storm Surcharge Is Based | kWh |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |
Wind plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross depreciable assets by plant type |  |  |  |  |  |  | 61.00% |  |  |  | 62.00% |  |  |  | 61.00% |  | 62.00% |  |  |  |  | 62.00% |  |  |  |  |  |  |
Nuclear Plant [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross depreciable assets by plant type |  |  |  |  |  |  | 9.00% |  |  |  | 10.00% |  |  |  | 9.00% |  | 10.00% |  |  |  |  | 10.00% |  |  |  |  |  |  |
Solar plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross depreciable assets by plant type |  |  |  |  |  |  | 15.00% |  |  |  | 14.00% |  |  |  | 15.00% |  | 14.00% |  |  |  |  | 14.00% |  |  |  |  |  |  |
Oil and Gas Properties [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross depreciable assets by plant type |  |  |  |  |  |  | 9.00% |  |  |  | 8.00% |  |  |  | 9.00% |  | 8.00% |  |  |  |  | 8.00% |  |  |  |  |  |  |
Minimum [Member] | Forecast [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory return on common equity (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |
Minimum [Member] | Wind plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Nuclear Plant [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Solar plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Forecast [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory return on common equity (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.60% |  |  |  |  |  |  |  |
Maximum [Member] | Wind plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Nuclear Plant [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Solar plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
NEP OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage |  |  |  |  |  |  | 65.10% |  |  |  |  |  |  |  | 65.10% |  |  |  |  |  |  |  |  |  |  |  |  |  | 79.90%
Energy Future Holdings Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated Merger [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EFH EFIH Termination Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |
HEI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated Merger [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
merger termination fee |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  | $ 90,000,000 |  |  |  |  | $ 90,000,000 |  |  |  |  |  |  |
Out of pocket expenses reimbursed to HEI |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  | 5,000,000 |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Common Units [Member] | NEP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units sold during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,527,435 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Units [Member] | NEP OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Purchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |
Stock Purchase Program, Amount Purchased |  |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Units [Member] | NEP [Member] | NEP OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units sold during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,527,435 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Units [Member] | Subsidiary of NextEra Energy [Member] | NEP OpCo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units sold during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal Fired Generation Facility [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal Fired Generating Facility Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |
Termination of Purchased Power Agreement and Purchase Price of Generation Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 521,000,000 |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 847,000,000 |  |  |  |  |  |  |  |  |  |
Regulatory Asset, Amortization Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |  |
Regulatory Assets, Net of Amortization |  |  |  |  |  |  | $ 636,000,000 |  |  |  | $ 726,000,000 |  |  |  | $ 636,000,000 |  | $ 726,000,000 |  |  |  |  | $ 726,000,000 |  |  |  |  |  |  |
Reduction To Reserve Amount Related to Settlement That May Be Amortized Under the 2012 Rate Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revised Reserve Amount That May Be Amortized Under the 2012 Rate Agreement Less Reduction Related to Settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, Before Tax |  |  |  |  |  | $ 4,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Deconsolidation, After Tax |  |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  |  |  |
Wind plants [Member] | Subsidiary of NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW |  |  |  |  |  |  | 244 |  |  |  |  |  |  |  | 244 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Generation Facilities [Member] [Member] | Subsidiary of NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW |  |  |  |  |  |  |  |  |  |  | 840 |  |  |  |  |  | 840 |  |  |  |  | 840 |  |  |  |  |  |  |
Assets and Liabilities Associated with Assets Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 113,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Merchant Natural Gas Generation Facilities [Member] | Subsidiary of NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC rate orders [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewable Energy Assets, Power Generation Capacity | MW |  |  |  |  |  |  |  |  |  |  | 2,884 |  |  |  |  |  | 2,884 |  |  |  |  | 2,884 |  |  |  |  |  |  |
Assets and Liabilities Associated with Assets Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 456,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 254,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,000,000 |  |  |  |  |  |  |  |  |  |  |  |
FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets and Liabilities Associated with Assets Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Interest in Consolidated Subsidiaries |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long term debt |  |  |  |  | $ 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ownership interest in subsidiary after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 685,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxes other than income taxes and other - net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Deferred Gain on Sale of Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,000,000 |  | 37,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Indiantown, Florida [Member] | Coal Fired Generation Facility [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal Fired Generating Facility Capacity | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 330 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination of Purchased Power Agreement and Purchase Price of Generation Facility |  |  |  |  |  |  | $ 451,000,000 |  |  |  |  |  |  |  | $ 451,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  | 451,000,000 |  |  |  |  |  |  |  | $ 451,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset, Amortization Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets, Net of Amortization |  |  |  |  |  |  | 401,000,000 |  |  |  |  |  |  |  | $ 401,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination of Purchased Power Agreement and Purchase Price of Generation Facility, Liabilities Assumed |  |  |  |  |  |  | 218,000,000 |  |  |  |  |  |  |  | 218,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated Merger [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Oncor Electric Delivery Company LLC [Member] | EFH Merger Co., LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated Merger [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |
Energy Future Holdings Corp. [Member] | EFH Merger Co., LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated Merger [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests to be Acquired in Merger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Service Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NET INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service Life [Member] | Wind plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service Life [Member] | Maximum [Member] | Wind plants [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Plant, Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2017-05 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital |  | 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2017-05 [Member] | Subsequent Event [Member] | NEER [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | (50,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital |  | $ (830,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current other assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  | 247,000,000 |  |  |  |  |  |  |  | $ 247,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current other assets [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  | 128,000,000 |  |  |  |  |  |  |  | 128,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  | $ 228,000,000 |  |  |  |  |  | 228,000,000 |  |  |  |  | $ 228,000,000 |  |  |  |  |  |  |
Other Noncurrent Assets [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  | $ 120,000,000 |  |  |  |  |  | $ 120,000,000 |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |
Other Current Liabilities [Member] | FPL[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, accrued storm restoration costs |  |  |  |  |  |  | $ 428,000,000 |  |  |  |  |  |  |  | $ 428,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | FPL's comprehensive income is the same as reported net income

X
- Definition For FPL, this element represents the accrued liability for nuclear maintenance costs, which are included in regulatory liabilities - other in the consolidated balance sheets. + References No definition available. + Details
Name: | nee_AccruedLiabilityForNuclearMaintenanceCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortization of Profit Sharing Liability + References No definition available. + Details
Name: | nee_AmortizationofProfitSharingLiability
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of reserve amortization (reversal) recognized + References No definition available. + Details
Name: | nee_Amountofreserveamortizationrecognized
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Approximate number of customer accounts serviced by FPL. + References No definition available. + Details
Name: | nee_ApproximateNumberOfCustomerAccounts
Namespace Prefix: | nee_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Assets and Liabilities Associated with Assets Held for Sale [Abstract] + References No definition available. + Details
Name: | nee_AssetsandLiabilitiesAssociatedwithAssetsHeldforSaleAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Base Rate Revenue, Installed Solar Cap Cost, Per Unit of Power + References No definition available. + Details
Name: | nee_BaseRateRevenueInstalledSolarCapCostPerUnitofPower
Namespace Prefix: | nee_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | nee_BasisOfPresentationAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business Acquisition, Percentage of Voting Interests to be Acquired in Merger + References No definition available. + Details
Name: | nee_BusinessAcquisitionPercentageofVotingIntereststobeAcquiredinMerger
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For NextEra Energy Resources, this element represents the capitalized major maintenance costs, net of accumulated amortization, which are included in other assets in the consolidated balance sheets. These major maintenance costs are for nuclear generating units and combustion turbines. + References No definition available. + Details
Name: | nee_CapitalizedMajorMaintenanceCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capacity of coal-fired qualifying facility + References No definition available. + Details
Name: | nee_CoalFiredGeneratingFacilityCapacity
Namespace Prefix: | nee_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | nee_ConstructionActivityAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of convertible ITCs recorded during the year. Convertible ITCs are amortized as a reduction to depreciation and amortization expense over the estimated life of the related property, plant and equipment. + References No definition available. + Details
Name: | nee_ConvertibleInvestmentTaxCredits
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Convertible investment tax credits (ITCs) included in other receivables on the consolidated balance sheets. Convertible ITCs are amortized as a reduction to depreciation and amortization expense over the estimated life of the related property, plant and equipment. + References No definition available. + Details
Name: | nee_ConvertibleInvestmentTaxCreditsIncludedInOtherReceivables
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | nee_DecommissioningOfNuclearPlantsDismantlementOfPlantsAndOtherAccruedAssetRemovalCostsAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deemed capital structure of subsidiary for purposes of allocating interest expense. + References No definition available. + Details
Name: | nee_DeemedCapitalStructure
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Deferred Costs and Other Assets, Nuclear Maintenance Costs + References No definition available. + Details
Name: | nee_DeferredCostsandOtherAssetsNuclearMaintenanceCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Deferred income tax benefit related to the difference between the financial statement and tax bases of renewable property. + References No definition available. + Details
Name: | nee_DeferredIncomeTaxBenefitAssociatedWithConvertibleInvestmentTaxCredits
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition EFH EFIH Termination Fee + References No definition available. + Details
Name: | nee_EFHEFIHTerminationFee
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For FPL, this element represents the threshold of the earned regulatory ROE above which retail base rate reduction may be sought. + References No definition available. + Details
Name: | nee_EarnedRegulatoryRoeThresholdAboveWhichRetailbaseRateReductionMayBeSought
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the threshold of the earned regulatory ROE below which retail base rate relief may be sought. + References No definition available. + Details
Name: | nee_EarnedRegulatoryRoeThresholdBelowWhichRetailbaseRateReliefMayBeSought
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For NextEra Energy Resources, the effective period for Seabrook Station's decommissioning funding plan filed with the New Hampshire Nuclear Decommissioning Financing Committee (NDFC). + References No definition available. + Details
Name: | nee_EffectivePeriodForDecommissioningFundingPlanForSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the percentage of electric distribution assets to gross investment in electric utility plant in service. + References No definition available. + Details
Name: | nee_ElectricDistributionAssetsToGrossInvestmentInElectricUtilityPlantInService
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For FPL, this element represents the percentage of electric generating assets to gross investment in electric utility plant in service. + References No definition available. + Details
Name: | nee_ElectricGeneratingAssetsToGrossInvestmentInElectricUtilityPlantInService
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | nee_ElectricPlantDepreciationAndAmortizationAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the percentage of electric transmission assets to gross investment in electric utility plant in service. + References No definition available. + Details
Name: | nee_ElectricTransmissionAssetsToGrossInvestmentInElectricUtilityPlantInService
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Eligible Storm Recovery Costs + References No definition available. + Details
Name: | nee_EligibleStormRecoveryCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity Method Investment, Realized Gain (Loss) on Deconsolidation, After Tax + References No definition available. + Details
Name: | nee_EquityMethodInvestmentRealizedGainLossonDeconsolidationAfterTax
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity Method Investment, Realized Gain (Loss) on Deconsolidation, Before Tax + References No definition available. + Details
Name: | nee_EquityMethodInvestmentRealizedGainLossonDeconsolidationBeforeTax
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | nee_FpscRateOrderRateCaseAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, total of franchise fees and gross receipts taxes reported gross in operating revenues and taxes other than income taxes and other on the Consolidated Statements of Income. + References No definition available. + Details
Name: | nee_FranchiseFeesAndGrossReceiptsTaxes
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For FPL, earnings on nuclear decommissioning reserve funds, net of taxes, which are reinvested in the funds and recognized as income/loss with an offset recorded to reflect a corresponding increase/decrease in the related regulatory liability accounts (with no effect on net income). + References No definition available. + Details
Name: | nee_FundEarningsOnDecommissioningFundsOfWhollyOwnedSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain on sale of ownership interest in subsidiary + References No definition available. + Details
Name: | nee_Gainonsaleofownershipinterestinsubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain on sale of ownership interest in subsidiary after tax + References No definition available. + Details
Name: | nee_Gainonsaleofownershipinterestinsubsidiaryaftertax
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For FPL, this element represents the percentage of general facilities assets to gross investment in electric utility plant in service. + References No definition available. + Details
Name: | nee_GeneralFacilitiesAssetsToGrossInvestmentInElectricUtilityPlantInService
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For FPL, this amount represents the increase in retail base rate revenues on an annualized basis beginning when the rate agreement became effective. + References No definition available. + Details
Name: | nee_IncreaseInBaseRateRevenues
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For FPL, this element represents the increment (in kwh) of usage on which the future storm restoration costs maximum surcharge is based. + References No definition available. + Details
Name: | nee_IncrementOfUsageInKwhOnWhichSurchargeIsBased
Namespace Prefix: | nee_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition For NextEra Energy Resources, this element represents the amount of major maintenance costs, which are included in OM (operations and maintenance) expenses in the consolidated statements of income. These major maintenance costs are primarily for nuclear generating units and combustion turbines. + References No definition available. + Details
Name: | nee_MajorMaintenanceCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | nee_MajorMaintenanceCostsAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum Amount Of Depreciation Reserve That May Be Amortized + References No definition available. + Details
Name: | nee_MaximumAmountOfDepreciationReserveThatMayBeAmortized
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For substantially all of FPL's property, the maximum interval (in years) between depreciation studies that are performed and filed with the Florida Public Service Commission (FPSC). + References No definition available. + Details
Name: | nee_MaximumIntervalBetweenDepreciationStudies
Namespace Prefix: | nee_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, the maximum interval (in years) between nuclear decommissioning studies that are submitted to the Florida Public Service Commission (FPSC) for approval. + References No definition available. + Details
Name: | nee_MaximumIntervalBetweenNuclearDecommissioningStudies
Namespace Prefix: | nee_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, the maximum interval (in years) between plant dismantlement studies that are submitted to the Florida Public Service Commission (FPSC) for approval. + References No definition available. + Details
Name: | nee_MaximumIntervalBetweenPlantDismantlementStudies
Namespace Prefix: | nee_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the future storm restoration costs maximum surcharge for every 1,000 kwh of usage on residential bills during the first 12 months. + References No definition available. + Details
Name: | nee_MaximumSurcharge
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition merger termination fee + References No definition available. + Details
Name: | nee_Mergerterminationfee
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For NextEra Energy Resources, this element represents the net book value of assets which serve as collateral that secure various financings for electric generating facilities. + References No definition available. + Details
Name: | nee_NetBookValueOfAssetsServingAsCollateral
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For FPL, this element represents the amount of nuclear maintenance costs recognized during the period, which are primarily included in OM (operations and maintenance) expenses in the consolidated statements of income. + References No definition available. + Details
Name: | nee_NuclearMaintenanceCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For FPL, the number of nuclear units for which the ultimate costs of decommissioning, including costs associated with spent fuel storage above what is expected to be refunded by the U.S. Department of Energy under a spent fuel settlement agreement, are indicated in the nuclear decommissioning study submitted to the FPSC. + References No definition available. + Details
Name: | nee_NumberOfNuclearUnitsOfWhollyOwnedSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Projects + References No definition available. + Details
Name: | nee_NumberofProjects
Namespace Prefix: | nee_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Original Reserve Amount That May Be Amortized Under the 2012 Rate Agreement + References No definition available. + Details
Name: | nee_OriginalReserveAmountThatMayBeAmortizedUnderthe2012RateAgreement
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Out of pocket expenses incurred in connection with the merger to be reimbursed to HEI + References No definition available. + Details
Name: | nee_OutofpocketexpensesreimbursedtoHEI
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of Certain Gains Received by Customers From Base Rate Revenue + References No definition available. + Details
Name: | nee_PercentageofCertainGainsReceivedbyCustomersFromBaseRateRevenue
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of depreciable electric plant in service and other property by plant type + References No definition available. + Details
Name: | nee_Percentageofgrossdepreciableassetsbyplanttype
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Plant Dismantlement Approved Expense After Dismantlement Study + References No definition available. + Details
Name: | nee_PlantDismantlementApprovedExpenseAfterDismantlementStudy
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For FPL, the amount of annual expense related to plant dismantlement approved by the FPSC as part of the prior dismantlement study. + References No definition available. + Details
Name: | nee_PlantDismantlementApprovedExpensePriorDismantlementStudy
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Certain equity and asset transactions between NEP, NEER and NEP OpCo involve the exchange of cash, energy projects and ownership interests in NEP OpCo. These exchanges are accounted for under the profit sharing method and resulted in a profit sharing liability, net of amortization. + References No definition available. + Details
Name: | nee_ProfitSharingLiabilitynetofAmortization
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For NextEra Energy Resources, the amount of project development costs capitalized as of the balance sheet date. These costs include land rights and other third-party costs directly associated with the development of a new project. Upon commencement of construction, these costs either are transferred to construction work in progress or remain in other assets, depending upon the nature of the cost. Capitalized development costs are charged to OM expenses when recoverability is no longer probable. + References No definition available. + Details
Name: | nee_ProjectDevelopmentCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proposed Merger [Abstract] + References No definition available. + Details
Name: | nee_ProposedMergerAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Accrued Storm Restoration Costs + References No definition available. + Details
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Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Proceeds from Recovery of Storm Restoration Costs + References No definition available. + Details
Name: | nee_PublicUtilitiesProceedsfromRecoveryofStormRestorationCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Provision for Storm Insurance Reserve + References No definition available. + Details
Name: | nee_PublicUtilitiesProvisionforStormInsuranceReserve
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Storm Restoration Costs + References No definition available. + Details
Name: | nee_PublicUtilitiesStormRestorationCosts
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reduction To Reserve Amount Related to Settlement That May Be Amortized Under the 2012 Rate Agreement + References No definition available. + Details
Name: | nee_ReductionToReserveAmountRelatedtoSettlementThatMayBeAmortizedUnderthe2012RateAgreement
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory Assets, Net of Amortization + References No definition available. + Details
Name: | nee_RegulatoryAssetsNetofAmortization
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For FPL, this element represents the regulatory return on common equity. + References No definition available. + Details
Name: | nee_RegulatoryReturnOnCommonEquity
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the regulatory return on common equity range of plus or minus basis points. + References No definition available. + Details
Name: | nee_RegulatoryReturnOnCommonEquityBasisPoints
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Renewable Energy Assets, Power Generation Capacity + References No definition available. + Details
Name: | nee_RenewableEnergyAssetsPowerGenerationCapacity
Namespace Prefix: | nee_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reserve Amount Remaining Under 2012 Rate Agreement That May Be Amortized + References No definition available. + Details
Name: | nee_ReserveAmountRemainingUnder2012RateAgreementThatMayBeAmortized
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Where offsetting positions exist, restricted cash related to margin cash collateral that is netted against derivative instruments + References No definition available. + Details
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Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The revenue equivalent of the difference in accumulated deferred income taxes computed under accounting rules, as compared to regulatory accounting rules. Included in other regulatory assets on the consolidated balance sheets, this amount is being amortized in accordance with the regulatory treatment over the estimated lives of the assets or liabilities for which the deferred tax amount was initially recognized. + References No definition available. + Details
Name: | nee_RevenueEquivalentOfDifferenceInAccumulatedDeferredIncomeTaxesComputerUnderAccountingRulesVersusRegulatoryRules
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Revised Reserve Amount That May Be Amortized Under the 2012 Rate Agreement Less Reduction Related to Settlement + References No definition available. + Details
Name: | nee_RevisedReserveAmountThatMayBeAmortizedUnderthe2012RateAgreementLessReductionRelatedtoSettlement
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | nee_SecuritizedStormRecoveryCostsStormFundAndStormReserveAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total capability of solar electric generating facilities + References No definition available. + Details
Name: | nee_SolarGeneratingFacilityCapability
Namespace Prefix: | nee_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stock Purchase Program, Amount Purchased + References No definition available. + Details
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Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Stock Purchase Program, Authorized Amount + References No definition available. + Details
Name: | nee_StockPurchaseProgramAuthorizedAmount
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Storm and Property Insurance Reserve, Capacity Prior to Hurricane Matthew + References No definition available. + Details
Name: | nee_StormandPropertyInsuranceReserveCapacityPriortoHurricaneMatthew
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Storm and Property Insurance Reserve, Cost Recovery and Replenish Reserve Amount + References No definition available. + Details
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Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For FPL, revenues from surcharges related to storm-recovery included in operating revenues on Consolidated Statements of Income. + References No definition available. + Details
Name: | nee_SurchargesRelatedToStormRecovery
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Termination of Purchased Power Agreement and Purchase Price of Generation Facility + References No definition available. + Details
Name: | nee_TerminationofPurchasedPowerAgreementandPurchasePriceofGenerationFacility
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Termination of Purchased Power Agreement and Purchase Price of Generation Facility, Liabilities Assumed + References No definition available. + Details
Name: | nee_TerminationofPurchasedPowerAgreementandPurchasePriceofGenerationFacilityLiabilitiesAssumed
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For FPL, FPSC rules limit the recording of allowance for funds used during construction (AFUDC) to projects that cost in excess of this threshold percentage of a utility's plant in service balance, and that require more than one year to complete. FPSC rules allow construction projects below this threshold as a component of rate base. + References No definition available. + Details
Name: | nee_ThresholdOfPlantInServiceBalanceAtWhichAfudcMayBeRecorded
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition For FPL, this element represents the minimum amount of storm restoration costs in any given calendar year at which FPL may request an increase to the maximum future storm restoration costs surcharge. + References No definition available. + Details
Name: | nee_ThresholdOfStormRestorationCostsInAnyGivenCalendarYearAtWhichSurchargeMayBeIncreased
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Threshold Of Storm Restoration Costs In Any Given Calendar Year At Which Surcharge May Be Increased, Amount Above Which May be Recovered + References No definition available. + Details
Name: | nee_ThresholdOfStormRestorationCostsInAnyGivenCalendarYearAtWhichSurchargeMayBeIncreasedAmountAboveWhichMayBeRecovered
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents NextEra Energy Resources' portion of the approximate ultimate costs of nuclear decommissioning, including costs associated with spent fuel storage above what is expected to be refunded by the Department of Energy under a spent fuel settlement agreement. + References No definition available. + Details
Name: | nee_UltimateCostsOfNuclearDecommissioningForWhollyOwnedIndirectSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents FPL's portion of the approximate ultimate costs of nuclear decommissioning, including costs associated with spent fuel storage above what is expected to be refunded by the Department of Energy under a spent fuel settlement agreement. + References No definition available. + Details
Name: | nee_UltimateCostsOfNuclearDecommissioningForWhollyOwnedSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents NextEra Energy Resources' portion of the approximate ultimate costs of nuclear decommissioning, including costs associated with spent fuel storage above what is expected to be refunded by the Department of Energy under a spent fuel settlement agreement, expressed in current year dollars. + References No definition available. + Details
Name: | nee_UltimateCostsOfNuclearDecommissioningInCurrentYearDollarsForWhollyOwnedIndirectSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents FPL's portion of the approximate ultimate costs of nuclear decommissioning, including costs associated with spent fuel storage above what is expected to be refunded by the Department of Energy under a spent fuel settlement agreement, expressed in current year dollars. + References No definition available. + Details
Name: | nee_UltimateCostsOfNuclearDecommissioningInCurrentYearDollarsForWhollyOwnedSubsidiary
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The element represents FPL's portion of the approximate ultimate costs of plant dismantlement. + References No definition available. + Details
Name: | nee_UltimateCostsOfPlantDismantlement
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents FPL's portion of the approximate ultimate costs of plant dismantlement, expressed in current year dollars. + References No definition available. + Details
Name: | nee_UltimateCostsOfPlantDismantlementInCurrentYearDollars
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ultimate cost to dismantle wind and solar facilities, where required + References No definition available. + Details
Name: | nee_Ultimatecosttodismantlewindandsolarfacilitieswhererequired
Namespace Prefix: | nee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Variable Interest Entities [Abstract] + References No definition available. + Details
Name: | nee_VariableInterestEntitiesAbstract
Namespace Prefix: | nee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total capability of wind electric generating facilities. + References No definition available. + Details
Name: | nee_WindElectricGeneratingFacilityCapability
Namespace Prefix: | nee_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32262-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 255 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82838779&loc=d3e2408-110839 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DeferredIncomeTaxesAndTaxCreditsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_NoncontrollingInterestAbstract
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Balance Type: | na
Period Type: | duration

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- Definition Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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