Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Balance, Beginning of Period		$ 849	$ (369)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		927	155
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		166	304
Other Comprehensive Income (Loss), Tax		(190)	(110)
Balance, End of Period		1,752	(20)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		130	87	$ (19)	$ 69
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax	[1]	(4,897)	(4,695)	(4,526)	(3,668)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		(17)	(29)	(20)	(29)
AOCI, Liability for Future Policy Benefit, after Tax		6,533	4,611	5,412	3,256
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax		3	6	$ 2	$ 3
Accumulated Translation Adjustment [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		131	39
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		18	(21)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	(654)	(1,625)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	167	304
Other Comprehensive Income (Loss), Tax	[1]	(116)	(294)
Accumulated Defined Benefit Plans Adjustment [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		4	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(1)	0
Other Comprehensive Income (Loss), Tax		0	0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent
Other Comprehensive Income (Loss), before Reclassifications, before Tax		1	4
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		0	(1)
AOCI, Liability for Future Policy Benefit, Parent
Other Comprehensive Income (Loss), before Reclassifications, before Tax		1,445	1,737
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		$ 324	$ 382

[1] Includes cash flow hedges of $(473) and $(495) as of June 30, 2025 and December 31, 2024, respectively, and $(413) and $(218) as of June 30, 2024 and December 31, 2023, respectively. See Note 11 – “Derivative Instruments” for additional information on cash flow hedges.