DAC, VOBA, DSI, and DFEL - DAC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Amortization	$ (1,000)	$ (992)	$ (969)
Traditional Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	1,332	1,286
Business acquired (sold) through reinsurance	0	0
Deferrals	107	188
Amortization	(145)	(142)
Balance as of end-of-year	1,294	1,332	1,286
UL and Other
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	5,709	5,518
Business acquired (sold) through reinsurance	(73)	(11)
Deferrals	420	482
Amortization	(302)	(291)
Balance as of end-of-year	5,754	5,709	5,518
Group Protection
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	154	141
Business acquired (sold) through reinsurance	(38)
Deferrals	134	113
Amortization	(114)	(100)
Balance as of end-of-year	136	154	141
Retirement Plan Services
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	244	241
Business acquired (sold) through reinsurance	0
Deferrals	21	21
Amortization	(19)	(18)
Balance as of end-of-year	246	244	241
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	3,868	3,880
Business acquired (sold) through reinsurance	0
Deferrals	454	361
Amortization	(363)	(373)
Balance as of end-of-year	3,959	3,868	3,880
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	421	439
Business acquired (sold) through reinsurance	0	0
Deferrals	44	50
Amortization	(72)	(68)
Balance as of end-of-year	$ 393	$ 421	$ 439