Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Present Value of Expected Future Policy Benefits
Net balance as of end-of-period	$ 42,010		$ 42,077
Payout Annuities
Present Value of Expected Net Premiums
Balance as of beginning-of-year	0	$ 0
Beginning balance at original discount rate	0	0
Effect of actual variances from expected experience			0	$ 0
Adjusted balance as of beginning-of-year			0	0
Issuances	0	0
Interest accrual	0	0
Net premiums collected	0	0
Flooring impact of LFPB	0	0
Ending balance at original discount rate	0	0
Effect of cumulative changes in discount rate assumptions	0	0
Balance as of end-of-period	0	0
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	2,037	2,009
Beginning balance at original discount rate	2,219	2,260
Effect of actual variances from expected experience			(3)	(1)
Adjusted balance as of beginning-of-year			2,216	2,259
Issuances	18	22
Interest accrual	22	22
Benefit payments	(55)	(49)
Ending balance at original discount rate	2,201	2,254
Effect of cumulative changes in discount rate assumptions	(211)	(221)
Balance as of end-of-period	1,990	2,033
Net balance as of end-of-period	1,990	2,033	2,037
Less: Reinsurance recoverables	1,389	1,478
Net balance as of end-of-period, net of reinsurance	$ 601	$ 555
Weighted-average duration of future policyholder benefit liability	8 years	9 years
Deferred profit liability	$ 94	$ 65	92	62
Payout Annuities | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected Net Premiums
Balance as of beginning-of-year	0	0
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	(182)	(251)
Traditional Life
Present Value of Expected Net Premiums
Balance as of beginning-of-year	5,351	5,873
Beginning balance at original discount rate	5,441	6,148
Effect of actual variances from expected experience			(7)	(48)
Adjusted balance as of beginning-of-year			5,434	6,100
Issuances	72	64
Interest accrual	56	62
Net premiums collected	(177)	(192)
Flooring impact of LFPB	(11)	(5)
Ending balance at original discount rate	5,374	6,029
Effect of cumulative changes in discount rate assumptions	(155)	(196)
Balance as of end-of-period	5,219	5,833
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	9,106	9,647
Beginning balance at original discount rate	9,250	10,085
Effect of actual variances from expected experience			(31)	(55)
Adjusted balance as of beginning-of-year			9,219	$ 10,030
Issuances	72	64
Interest accrual	92	99
Benefit payments	(199)	(234)
Ending balance at original discount rate	9,184	9,959
Effect of cumulative changes in discount rate assumptions	(262)	(305)
Balance as of end-of-period	8,922	9,654
Net balance as of end-of-period	3,703	3,821	$ 3,755
Less: Reinsurance recoverables	261	360
Net balance as of end-of-period, net of reinsurance	$ 3,442	$ 3,461
Weighted-average duration of future policyholder benefit liability	8 years	9 years
Impact on net premiums, mortality	$ 7	$ (5)
Impact on future policy benefits, mortality	23	3
Impact on future policy benefits, policyholder behavior	8	(58)
Impact on net premiums, policyholder behavior		43
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected Net Premiums
Balance as of beginning-of-year	(90)	(275)
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	$ (144)	$ (438)