Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Derivative Asset [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 187	$ 154
Derivative Asset, Fair Value, Gross Liability		(64)	(57)
Derivative Asset		123	97
Derivative Asset, Fair Value of Collateral	[1]	(123)	(97)
Derivative, Collateral, Obligation to Return Cash		0	0
Derivative Liability [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability		550	254
Derivative Liability, Fair Value, Gross Asset		(64)	(57)
Derivative Liability		486	197
Derivative Liability, Fair Value of Collateral	[1]	(486)	(197)
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.