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Variable Interest Entities (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) variable_interest_entity entities MW | Dec. 31, 2016 USD ($) variable_interest_entity entities | Dec. 31, 2015 USD ($) | Jul. 01, 2014 | Dec. 31, 2007 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | 37 |  |  |  |
Investment in equity method investees | $ 2,321 | $ 1,767 | $ 1,063 |  |
NEP OpCo [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | variable_interest_entity | 1 |  |  |  |
Carrying amount of assets, consolidated variable interest entity | $ 8,400 | 7,200 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | 6,200 | 5,000 |  |  |
Other variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investments in special purpose entities | 2,634 | 2,505 |  |  |
FPL[Member] | Bankruptcy remote special purpose subsidiary [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Storm-recovery bonds aggregate principal amount issued |  |  |  |  | $ 652
Proceeds from issuance of storm-recovery bonds |  |  |  |  | $ 644
Carrying amount of assets, consolidated variable interest entity | 148 | 216 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | 147 | 214 |  |  |
FPL[Member] | Other variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investments in special purpose entities | $ 2,195 | 2,049 |  |  |
NEER [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | entities | 36 |  |  |  |
Investment in equity method investees | $ 2,129 | 1,488 |  |  |
NEER [Member] | Gas and/or oil variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of assets, consolidated variable interest entity | 89 | 95 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | $ 29 | 42 |  |  |
Natural gas and or oil electric generating facility capacity (in megawatts) | MW | 110 |  |  |  |
NEER [Member] | Photovoltaic Solar Facility [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Solar generating facility capability | MW | 374 |  |  |  |
NEER [Member] | Special Purpose Entity that has Insufficient Equity at Risk [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | variable_interest_entity | 1 |  |  |  |
Carrying amount of assets, consolidated variable interest entity | $ 490 | 502 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | $ 502 | $ 511 |  |  |
NEER [Member] | Wind variable interest entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | entities | 31 | 27 |  |  |
Carrying amount of assets, consolidated variable interest entity | $ 13,100 | $ 10,900 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | $ 6,900 | 6,900 |  |  |
Wind electric generating facility capability (in megawatts) | MW | 8,197 |  |  |  |
NEER [Member] | Gas and or Oil Variable Interest Entities [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | entities | 1 |  |  |  |
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total number of consolidated variable interest entities (in entities) | entities | 2 |  |  |  |
Carrying amount of assets, consolidated variable interest entity | $ 548 | 571 |  |  |
Carrying amount of liabilities, consolidated variable interest entity | $ 594 | 487 |  |  |
Ownership percentage (in hundredths) | 50.00% |  |  |  |
Solar generating facility capability | MW | 277 |  |  |  |
Subsidiaries of NEE [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Equity method investments, additional commitments to invest | $ 75 | $ 30 |  |  |
Equity method investments, additional variable interest entities committed to invest in | variable_interest_entity | 3 | 2 |  |  |
NEP OpCo [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Noncontrolling interest ownership percentage | 65.10% |  |  | 79.90% |
Other Investments [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in equity method investees | $ 248 | $ 234 |  |  |

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