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Derivative Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (7) |  |
Derivative, Collateral, Obligation to Return Cash | 6 | $ 10 |
Margin Cash Collateral Not Netted Against Derivative Liabilities | 315 | 360 |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 26 | 11 | $ 3
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 6 | $ 8 | $ 2
FPL[Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Collateral, Obligation to Return Cash | 0 |  |
Margin Cash Collateral Not Netted Against Derivative Liabilities | 0 |  |
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Gains (Loss) On Disposal Of Businesses/Assets - Net [Member] |  |  |
Derivative [Line Items] |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $ 23 |  |

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