Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Derivative Assets [Abstract]
Gross Amounts Offset in the Balance Sheet		$ (70)	$ (64)
Derivative Liabilities [Abstract]
Gross Amounts Offset in the Balance Sheet		(70)	(64)
Net Amounts Presented in the Balance Sheet		187	160
Derivative Asset, Fair Value, Gross Asset		191	187
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral		121	123
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset	[1]	(121)	(123)
Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction		0	0
Derivative Liability, Fair Value, Gross Liability		548	550
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral		478	486
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset	[1]	(478)	(486)
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction		$ 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.