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Acquisitions (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) state utlity mi | Jul. 16, 2019 USD ($) mi | Jan. 01, 2019 USD ($) customer county mi MW | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) customer mi MW | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) county
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of counties In which entity operates | county |  |  |  |  |  |  | 8
Goodwill |  |  |  |  | $ 4,204 |  | $ 4,254
Carrying amount of assets, consolidated variable interest entity |  |  |  | $ 103,702 | 117,691 |  | 127,684
Subsequent Event [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Carrying amount of assets, consolidated variable interest entity |  |  |  |  |  | $ 6,700 |
Gulf Power [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  | $ 4,440 |  |  |  |
Debt assumed |  |  | 1,300 |  |  |  |
Assets assumed |  |  | 5,200 |  |  |  |
Property, plant, and equipment |  |  | 4,000 |  |  |  |
Regulatory assets |  |  | 494 |  |  |  |
Assumed liabilities |  |  | 3,400 |  |  |  |
Regulatory liabilities |  |  | 635 |  |  |  |
Deferred income taxes |  |  | $ 562 |  |  |  |
Goodwill |  |  |  |  |  |  | 2,700
Trans Bay Cable, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  | $ 670 |  |  |  |  |
Debt assumed |  | 422 |  |  |  |  |
Assets assumed |  | 703 |  |  |  |  |
Assumed liabilities |  | $ 643 |  |  |  |  |
Goodwill |  |  |  |  |  |  | 610
Goodwill, expected tax deductible amount |  |  |  |  |  |  | $ 572
Florida City Gas [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 530 |  |
Stanton Energy Center [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Membership interests acquired |  |  |  |  | 65.00% |  |
Natural Gas Generation Facilities [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 200 |  |
FPL [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  | 1,800 |
Property, plant, and equipment |  |  |  |  |  | 4,900 |
Regulatory assets |  |  |  |  |  | 1,200 |
Assumed liabilities |  |  |  |  |  | 3,900 |
Regulatory liabilities |  |  |  |  |  | 566 |
Deferred income taxes |  |  |  |  |  | 729 |
Goodwill |  |  |  |  |  | $ 2,700 |
Gulf Power [Member] | Gulf Power [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of customers served | customer |  |  | 470,000 |  |  |  |
Number of counties In which entity operates | county |  |  | 8 |  |  |  |
Length of power lines (mi) | mi |  |  | 9,500 |  |  |  |
Natural Gas And Or Oil Electric Generating Facility Capacity | MW |  |  | 2,300 |  |  |  |
NextEra Energy Capital Holdings, Inc. (Consolidated) [Member] | Loans Payable [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from Short-term Debt |  |  |  | $ 4,500 |  |  |
Trans Bay Cable, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Length of power lines (mi) | mi |  | 53 |  |  |  |  |
Florida City Gas [Member] | Florida City Gas [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of customers served | customer |  |  |  |  | 110,000 |  |
Length Of Natural Gas Pipeline | mi |  |  |  |  | 3,700 |  |
Oleader Power Project [Member] | Oleader Power Project [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Membership interests acquired |  |  |  |  | 100.00% |  |
Natural-Gas Fired, Simple-Cycle Combustion Turbine Electric Generation Facility | MW |  |  |  |  | 791 |  |
Entity That Owns Stanton Energy Center Unit A [Member] | Stanton Energy Center [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Membership interests acquired |  |  |  |  | 100.00% |  |
Stanton Energy Center [Member] | Stanton Energy Center [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Combined-cycle Electric Generation Facility | MW |  |  |  |  | 660 |  |
NEET [Member] | GridLiance [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Length of power lines (mi) | mi | 700 |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 660 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | $ 160 |  |  |  |  |  |
Number Of FERC-Regulated Transmission Utilities | utlity | 3 |  |  |  |  |  |
Number of States in which Entity Operates | state | 6 |  |  |  |  |  |
NEET [Member] | GridLiance [Member] | Midwest And Nevada [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of States in which Entity Operates | state | 5 |  |  |  |  |  |

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