DAC, VOBA, DSI, and DFEL - DAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Amortization	$ (275)	$ (247)
Traditional Life
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	1,180	1,294
Business acquired (sold) through reinsurance	0	0
Deferrals	3	22
Amortization	(33)	(36)
Balance as of end-of-period	1,150	1,280
UL and Other
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	5,864	5,754
Business acquired (sold) through reinsurance	(1)	0
Deferrals	104	87
Amortization	(81)	(77)
Balance as of end-of-period	5,886	5,764
Group Protection
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	178	136
Business acquired (sold) through reinsurance	0	13
Deferrals	29	33
Amortization	(28)	(14)
Balance as of end-of-period	179	168
Retirement Plan Services
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	247	246
Business acquired (sold) through reinsurance	0	0
Deferrals	6	5
Amortization	(5)	(5)
Balance as of end-of-period	248	246
Variable Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	4,107	3,959
Business acquired (sold) through reinsurance	0	0
Deferrals	141	135
Amortization	(111)	(99)
Balance as of end-of-period	4,137	3,995
Fixed Annuities
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance as of beginning-of-year	452	393
Business acquired (sold) through reinsurance	0	0
Deferrals	45	11
Amortization	(17)	(16)
Balance as of end-of-period	$ 480	$ 388