Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Derivative Assets [Abstract]
Derivative Fair Value Of Free Standing Derivative Asset		$ 155	$ 187
Gross Amounts Offset in the Balance Sheet		(39)	(64)
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral, Total		116	123
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset	[1]	116	123
Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction, Total		0	0
Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability		527	550
Gross Amounts Offset in the Balance Sheet		(39)	(64)
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total		488	486
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset	[1]	488	486
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction, Total		$ 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.