Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ 10
Derivatives(1)	(56)	$ (57)	$ (111)
Deferred income tax asset (liability)(2)	600	571	712
Total	(1,645)	(1,534)	(2,070)
Pension and other postretirement benefits liability, net of tax	1	3	3
AOCI	(1,644)	(1,531)	(2,067)
Fixed maturities, net of impairment	(1,995)	(1,827)	(2,544)
AOCI, Liability for Future Policy Benefit, before Tax	(306)	(335)	(349)
Other Comprehensive Income (Loss), Tax	29	(141)	965
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax	22	13	32
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax	(6)	(3)	(9)
Other Comprehensive Income (Loss), before Tax	(142)	677	(4,594)
Other Comprehensive Income (Loss), Net of Tax	(113)	536	(3,629)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	35		981
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total	(134)	565	(3,688)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax		150
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment and Tax	169	(715)	4,669
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	0	(12)	7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	4	13
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ 0	$ (4)	$ (13)