Derivative Instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (6,000,000)
Derivative, Collateral, Obligation to Return Cash	56,000,000	$ 6,000,000
Margin Cash Collateral Not Netted Against Derivative Liabilities	673,000,000	315,000,000
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent		26,000,000	$ 11,000,000
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent		6,000,000	$ 8,000,000
FPL [Member]
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	0	0
Margin Cash Collateral Not Netted Against Derivative Liabilities	$ 0	0
Interest rate contracts | 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		$ 23,000,000