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Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | $ 4,900 | $ 4,900 | $ 12,900 | $ 13,200 |
FPL [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | 3,400 | $ 3,500 | 8,800 | $ 9,200 |
Unbilled revenues | 468 |  | 468 |  | $ 389
NextEra Energy Resources [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue, remaining performance obligation | $ 870 |  | $ 870 |  |
Revenue Benchmark [Member] | FPL [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 90.00% |  |

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