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]
Fixed maturities, net of impairment	$ (2,553)	$ (2,370)	$ (3,294)
DAC/VOBA adjustment on available-for-sale securities(2)		64	125
AOCI, Liability for Future Policy Benefit, before Tax	(787)	(890)	(858)
Deferred income tax asset (liability)(2)	810	794	969
Total	(2,464)	(2,402)	(3,058)
Pension and other postretirement benefits liability, net of tax	2	2	3
Accumulated other comprehensive income (loss)	(2,462)	$ (2,400)	$ (3,055)
Accumulated Other Comprehensive Income (Loss), Derivative, before Tax	66
Other Contract
Components Of Accumulated Other Comprehensive Income Loss [Line Items]
Portion of AOCI expected to be reclassified into earnings within the next 12 months	$ 10