Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Present Value of Expected Future Policy Benefits
Net balance as of end-of-period	$ 42,201		$ 42,360
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	2,036	2,008
Beginning balance of original discount rate	2,218	2,259
Effect of actual variances from expected experience			(3)	(6)
Effect of cumulative changes in discount rate assumptions	(214)	(208)
Adjusted balance as of beginning-of-year			2,215	2,253
Issuances	51	47
Interest accrual	44	44
Benefit payments	(105)	(97)
Ending balance at original discount rate	2,205	2,247
Balance as of end-of-period	1,991	2,039
Net balance as of end-of-period	1,991	2,039	2,036
Less: Reinsurance recoverables	1,387	1,481
Net balance as of end-of-period, net of reinsurance	$ 604	$ 558
Weighted-average duration of future policyholder benefit liability (years)	8 years	9 years
Deferred profit liability	$ 101	$ 70	92	62
Payout Annuities | Cumulative effect from adoption of new accounting standards
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	5,286	5,751
Beginning balance at original discount rate	5,378	6,028
Effect of actual variances from expected experience			(14)	(32)
Adjusted balance as of beginning-of-year			5,364	5,996
Issuances	140	141
Interest accrual	110	121
Net premiums collected	(349)	(376)
Flooring impact of LFPB	(19)	(4)
Ending balance at original discount rate	5,246	5,878
Effect of cumulative changes in discount rate assumptions	(175)	(156)
Balance as of end-of-period	5,071	5,722
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	8,807	9,255
Beginning balance of original discount rate	8,961	9,701
Effect of actual variances from expected experience			(40)	(39)
Effect of cumulative changes in discount rate assumptions	(296)	(250)
Adjusted balance as of beginning-of-year			8,921	9,662
Issuances	140	141
Interest accrual	177	190
Benefit payments	(384)	(404)
Ending balance at original discount rate	8,854	9,589
Balance as of end-of-period	8,558	9,339
Net balance as of end-of-period	3,487	3,617	3,521
Less: Reinsurance recoverables	173	212
Net balance as of end-of-period, net of reinsurance	$ 3,314	$ 3,405
Weighted-average duration of future policyholder benefit liability (years)	8 years	9 years
Impact on future policy benefits, mortality	$ 30	$ 16
Impact on future policy benefits, policyholder behavior	10	23
Impact on net premiums, policyholder behavior		19
Impact on net premiums, mortality		13
Traditional Life | Cumulative effect from adoption of new accounting standards
Present Value of Expected Net Premiums
Balance as of beginning-of-year	(92)	(277)
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	(154)	(446)
Group Protection
Present Value of Expected Net Premiums
Effect of cumulative changes in discount rate assumptions			(363)	(550)
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	5,836	5,628
Beginning balance of original discount rate	6,199	6,178
Effect of actual variances from expected experience			(111)	(178)
Effect of cumulative changes in discount rate assumptions	(420)	(425)
Adjusted balance as of beginning-of-year			6,088	$ 6,000
Issuances	753	808
Interest accrual	108	100
Benefit payments	(748)	(724)
Ending balance at original discount rate	6,201	6,184
Balance as of end-of-period	5,781	5,759
Net balance as of end-of-period	5,781		$ 5,836
Less: Reinsurance recoverables	3,526	3,439
Net balance as of end-of-period, net of reinsurance	$ 2,255	$ 2,320
Weighted-average duration of future policyholder benefit liability (years)	5 years	5 years