DAC, VOBA, DSI, and DFEL - DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Amortization	$ (247)	$ (250)
Traditional Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	1,294	1,332
Business acquired (sold) through reinsurance	0	0
Deferrals	22	32
Amortization	(36)	(36)
Balance as of end-of-period	1,280	1,328
UL and Other
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	5,754	5,709
Business acquired (sold) through reinsurance	0	(73)
Deferrals	87	100
Amortization	(77)	(75)
Balance as of end-of-period	5,764	5,661
Group Protection
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	136	154
Business acquired (sold) through reinsurance	13	0
Deferrals	33	30
Amortization	(14)	(26)
Balance as of end-of-period	168	158
Retirement Plan Services
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	246	244
Business acquired (sold) through reinsurance	0	0
Deferrals	5	5
Amortization	(5)	(5)
Balance as of end-of-period	246	244
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	3,959	3,868
Business acquired (sold) through reinsurance	0	0
Deferrals	135	89
Amortization	(99)	(92)
Balance as of end-of-period	3,995	3,865
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	393	421
Business acquired (sold) through reinsurance	0	0
Deferrals	11	9
Amortization	(16)	(16)
Balance as of end-of-period	$ 388	$ 414