Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Derivative Asset [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 223	$ 194
Derivative Asset, Fair Value, Gross Liability		(53)	(19)
Derivative Asset		170	175
Derivative Asset, Fair Value of Collateral	[1]	(170)	(175)
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Liability [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		236	58
Derivative Liability, Fair Value, Gross Asset		(53)	(19)
Derivative Liability		183	39
Derivative Liability, Fair Value of Collateral	[1]	(183)	(39)
Derivative, Collateral, Right to Reclaim Cash		$ 0	$ 0

[1] Includes initial margin posted to a central clearing partner for financial instruments and excludes the excess of collateral received/pledged from/to the counterparty.