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

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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