Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Derivative Assets [Abstract]
Gross Amounts Offset in the Balance Sheet		$ (71)	$ (57)
Derivative Liabilities [Abstract]
Gross Amounts Offset in the Balance Sheet		(71)	(57)
Net Amounts Presented in the Balance Sheet		51	206
Derivative Asset, Fair Value, Gross Asset		270	154
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral		199	97
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset	[1]	(199)	(97)
Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction		0	0
Derivative Liability, Fair Value, Gross Liability		287	254
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral		216	197
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset	[1]	(216)	(197)
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.