DAC, VOBA, DSI, and DFEL - DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Amortization	$ (250)	$ (246)
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
Deferrals	32	55
Amortization	(36)	(35)
Balance as of end-of-period	1,328	1,306
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)
Deferrals	100	119
Amortization	(75)	(72)
Balance as of end-of-period	5,661	5,565
Group Protection
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	154	141
Business acquired (sold) through reinsurance	0
Deferrals	30	25
Amortization	(26)	(24)
Balance as of end-of-period	158	142
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	5	6
Amortization	(5)	(5)
Balance as of end-of-period	244	242
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	89	85
Amortization	(92)	(93)
Balance as of end-of-period	3,865	3,872
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
Deferrals	9	14
Amortization	(16)	(17)
Balance as of end-of-period	$ 414	$ 436