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Summary of Significant Accounting and Reporting Policies (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) solar_generation_facility | Dec. 31, 2018 USD ($) wind_generation_facility | Sep. 30, 2018 USD ($) MW | Sep. 30, 2017 USD ($) | [1] | Sep. 30, 2018 USD ($) MW | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents, current |  |  |  | $ 224 |  | $ 224 |  |  | $ 269
Restricted cash related to margin cash collateral that is netted against derivative instruments |  |  |  | 70 |  | 70 |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  | (64) | $ 9 | (754) | $ 29 | [1] |
FPL [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents, current |  |  |  | 102 |  | 102 |  |  | 141
FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of ownership interest in subsidiary |  |  |  |  |  |  | 1,100 |  |
Retirement of debt |  |  |  |  |  |  | 370 |  |
Gain on sale of ownership interest in subsidiary |  |  |  |  |  |  | 1,100 |  |
Gain on sale of ownership interest in subsidiary after-tax |  |  |  |  |  |  | $ 685 |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents, current |  |  |  | 198 |  | 198 |  |  | 247
Other Current Assets [Member] | FPL [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents, current |  |  |  | $ 76 |  | 76 |  |  | $ 128
Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) attributable to noncontrolling interest, before tax |  |  |  |  |  | 497 |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  | $ 373 |  |  |
Retained Earnings [Member] | Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, after tax | $ 34 |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax | 56 |  |  |  |  |  |  |  |
Retained Earnings [Member] | Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, after tax | (52) |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax | (69) |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] | Accounting Standards Update 2017-05 - Sales of Differential Membership Interests [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Additional paid in capital | (77) |  |  |  |  |  |  |  |
Additional paid in capital, after tax | (59) |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] | Accounting Standards Update 2017-05 - NEER Sale of Assets to NEP [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Additional paid in capital | 842 |  |  |  |  |  |  |  |
Additional paid in capital, after tax | $ 652 |  |  |  |  |  |  |  |
Assets Held for Sale [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Generating capacity (MW) | MW |  |  |  | 1,388 |  | 1,388 |  |  |
Liabilities associated with assets held for sale |  |  |  | $ 80 |  | $ 80 |  |  |
Scenario, Forecast [Member] | Assets Held for Sale [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of generation facilities purchased |  | 1 | 10 |  |  |  |  |  |
Purchase price |  | $ 1,300 | $ 1,300 |  |  |  |  |  |
Existing noncontrolling interests |  | $ 930 | $ 930 |  |  |  |  |  |
[1] | Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.

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