Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Amount of Hedged Item	$ (473)	$ (413)	$ (473)	$ (413)	$ (485)	$ (495)	$ (299)	$ (218)
Cash Flow Derivatives Deferred In OCI	(4)	(125)	(10)	(211)
Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	(18)	(14)	(36)	(22)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	$ (2)	$ (3)	$ (4)	$ (6)