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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |  |  |
Revenue from contracts with customers | $ 4,500 | $ 3,900 | $ 8,400 | $ 7,400 |
FPL [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue from contracts with customers | 3,100 | $ 2,900 | 5,700 | $ 5,500 |
Unbilled revenues | 533 |  | 533 |  | $ 432
NextEra Energy Resources [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue, remaining performance obligation | $ 840 |  | $ 840 |  |
Revenue Benchmark [Member] | FPL [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 90.00% |  |

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