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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative Asset [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 171 $ 137
Derivative Asset, Fair Value, Gross Liability (31) (20)
Derivative Asset 140 117
Derivative Asset, Fair Value of Collateral [1] (30) 0
Derivative, Collateral, Obligation to Return Cash (98) (119)
Derivative Asset, Fair Value, Amount Offset Against Collateral 12 (2)
Derivative Liability [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 80 73
Derivative Liability, Fair Value, Gross Asset (31) (20)
Derivative Liability 49 53
Derivative Liability, Fair Value of Collateral [1] (146) (92)
Derivative, Collateral, Right to Reclaim Cash (47) (52)
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (144) $ (91)
[1] Includes initial margin posted to a central clearing partner.