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Revenue Recognition (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from contracts with customers |  | $ 4,100 | $ 10,900
FPL [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from contracts with customers |  | 3,400 | 8,900
NextEra Energy Resources [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue, remaining performance obligation |  | $ 650 | $ 650
Sales Revenue, Net [Member] | FPL [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk, percentage |  |  | 90.00%
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Net reduction to retained earnings | $ 25 |  |

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