Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Balance, Beginning of Period		$ 849	$ (369)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		396	204
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		76	124
Other Comprehensive Income (Loss), Tax		(83)	84
Balance, End of Period		1,238	(125)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		(8)	57	$ (19)	$ 69
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax	[1]	(4,443)	(4,062)	(4,526)	(3,668)
AOCI, Liability for Future Policy Benefit, after Tax		5,702	3,906	5,412	3,256
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax		6	3	2	3
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		(19)	(29)	$ (20)	$ (29)
Accumulated Translation Adjustment [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(4)	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		15	(13)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[1]	27	(638)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	76	123
Other Comprehensive Income (Loss), Tax	[1]	20	(121)
Accumulated Defined Benefit Plans Adjustment [Member]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		1	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	1
Other Comprehensive Income (Loss), Tax		0	0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent
Other Comprehensive Income (Loss), before Reclassifications, before Tax		5	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		(1)	0
AOCI, Liability for Future Policy Benefit, Parent
Other Comprehensive Income (Loss), before Reclassifications, before Tax		367	842
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	0
Other Comprehensive Income (Loss), Tax		$ 77	$ 192

[1] Includes cash flow hedges of $(485) and $(495) as of March 31, 2025 and December 31, 2024, respectively, and $(299) and $(218) as of March 31, 2024 and December 31, 2023, respectively. See Note 11 – “Derivative Instruments” for additional information on cash flow hedges.