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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivative Asset [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 137 $ 247
Derivative Asset, Fair Value, Gross Liability (20) (19)
Derivative Asset 117 228
Derivative Asset, Fair Value of Collateral [1] 0 0
Derivative, Collateral, Obligation to Return Cash (119) (235)
Derivative Asset, Fair Value, Amount Offset Against Collateral (2) (7)
Derivative Liability [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 73 45
Derivative Liability, Fair Value, Gross Asset (20) (19)
Derivative Liability 53 26
Derivative Liability, Fair Value of Collateral [1] (92) (71)
Derivative, Collateral, Right to Reclaim Cash (52) (24)
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (91) $ (69)
[1]
Includes initial margin posted to a central clearing partner.