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Variable Interest Entities (VIEs) (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Sep. 30, 2018 USD ($) variable_interest_entity entities MW | Sep. 30, 2017 USD ($) | Dec. 31, 2007 USD ($) | Dec. 31, 2017 USD ($) variable_interest_entity
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  | 27 |  |  |
Proceeds from sale of special purpose entity | $ 71 |  |  |  |
Variable interest entity, gain (loss) on sale of investment, before tax | 50 |  |  |  |
Variable interest entity, gain (loss) on sale of investment, after tax | $ 37 |  |  |  |
Investment in equity method investees |  | $ 6,493 |  |  | $ 2,321
NEP OpCo [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  |  |  |  | 1
Carrying amount of assets, consolidated variable interest entity |  |  |  |  | $ 8,400
Carrying amount of liabilities, consolidated variable interest entity |  |  |  |  | 6,200
Other variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investments in special purpose entities |  | 2,883 |  |  | 2,634
FPL [Member] | Bankruptcy remote special purpose subsidiary [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Senior Secured Debt Aggregate Principal Amount Issued |  |  |  | $ 652 |
Carrying amount of assets, consolidated variable interest entity |  | 73 |  |  | 148
Carrying amount of liabilities, consolidated variable interest entity |  | 75 |  |  | 147
FPL [Member] | Other variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investments in special purpose entities |  | $ 2,390 |  |  | 2,195
NextEra Energy Resources [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | entities |  | 26 |  |  |
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of assets, consolidated variable interest entity |  | $ 64 |  |  | 89
Carrying amount of liabilities, consolidated variable interest entity |  | $ 18 |  |  | 29
Natural gas and or oil electric generating facility capacity (in megawatts) | MW |  | 110 |  |  |
NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  | 2 |  |  |
Number of entities with ownership interest contributed | entities |  | 3 |  |  |
Solar generating facility capability (in MW) | MW |  | 277 |  |  |
Wind electric generating facility capability (in megawatts) | MW |  | 374 |  |  |
NextEra Energy Resources [Member] | Special Purpose Entity that has Insufficient Equity at Risk [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of assets, consolidated variable interest entity |  |  |  |  | 490
Carrying amount of liabilities, consolidated variable interest entity |  |  |  |  | $ 502
NextEra Energy Resources [Member] | Wind variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  | 23 |  |  | 31
Carrying amount of assets, consolidated variable interest entity |  | $ 9,500 |  |  | $ 13,100
Carrying amount of liabilities, consolidated variable interest entity |  | $ 1,100 |  |  | 6,900
Wind electric generating facility capability (in megawatts) | MW |  | 6,035 |  |  |
NextEra Energy Resources [Member] | Gas and or Oil Variable Interest Entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  | 1 |  |  |
NextEra Energy Partners [Member] | Wind variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities | variable_interest_entity |  | 7 |  |  |
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of assets, consolidated variable interest entity |  | $ 549 |  |  | 548
Carrying amount of liabilities, consolidated variable interest entity |  | $ 554 |  |  | 594
Ownership percentage |  | 50.00% |  |  |
Subsidiaries of NEE [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Additional commitments to invest |  | $ 60 | $ 75 |  |
Additional VIEs committed to invest in | variable_interest_entity |  | 3 |  |  |
Other Investments [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in equity method investees |  | $ 4,782 |  |  | $ 248
Senior Secured Debt [Member] | FPL [Member] | Bankruptcy remote special purpose subsidiary [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from issuance of storm-recovery bonds |  |  |  | $ 644 |
NEP OpCo [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 65.10%

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