Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Present Value of Expected LFPB
Net balance as of end-of-period	$ 40,002	$ 40,174
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 changes in cash flow assumptions		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 LFPB
Balance as of beginning-of-year	2,084	2,003
Beginning balance at original discount rate	2,271	2,266
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		3	1
Adjusted balance as of beginning-of-year		2,274	2,267
Issuances	102	109
Interest accrual	87	86
Benefit payments	(204)	(191)
Ending balance at original discount rate	2,259	2,271
Effect of cumulative changes in discount rate assumptions	(251)	(187)
Balance as of end-of-period	2,008	2,084
Net balance as of end-of-period	2,008	2,084
Less: reinsurance recoverables	1,488	1,627
Net balance as of end-of-period, net of reinsurance	$ 520	$ 457
Weighted-average duration of future policyholder benefit liability	9 years	9 years
Deferred profit liability	$ 62	$ 56	38
Payout Annuities | Cumulative effect from adoption of new accounting standards
Present Value of Expected Net Premiums
Balance as of beginning-of-year	0	0
Balance as of end-of-period		0
Present Value of Expected LFPB
Balance as of beginning-of-year	(187)	(263)
Balance as of end-of-period		(187)
Traditional Life
Present Value of Expected Net Premiums
Balance as of beginning-of-year	6,084	5,896
Beginning balance at original discount rate	6,236	6,480
Effect of changes in cash flow assumptions		(3)	(5)
Effect of actual variances from expected experience		(45)	(275)
Adjusted balance as of beginning-of-year	6,188	6,200
Issuances	361	580
Interest accrual	245	236
Net premiums collected	(766)	(784)
Flooring impact of LFPB	0	4
Ending balance at original discount rate	6,028	6,236
Effect of cumulative changes in discount rate assumptions	(277)	(152)
Balance as of end-of-period	5,751	6,084
Present Value of Expected LFPB
Balance as of beginning-of-year	9,637	9,086
Beginning balance at original discount rate	9,839	9,879
Effect of changes in cash flow assumptions		(105)	(21)
Effect of actual variances from expected experience		(68)	(305)
Adjusted balance as of beginning-of-year		9,666	$ 9,553
Issuances	361	580
Interest accrual	380	364
Benefit payments	(706)	(658)
Ending balance at original discount rate	9,701	9,839
Effect of cumulative changes in discount rate assumptions	(446)	(202)
Balance as of end-of-period	9,255	9,637
Net balance as of end-of-period	3,504	3,553
Less: reinsurance recoverables	217	255
Net balance as of end-of-period, net of reinsurance	$ 3,287	$ 3,298
Weighted-average duration of future policyholder benefit liability	9 years	10 years
Traditional Life | Cumulative effect from adoption of new accounting standards
Present Value of Expected Net Premiums
Balance as of beginning-of-year	$ (152)	$ (584)
Balance as of end-of-period		(152)
Present Value of Expected LFPB
Balance as of beginning-of-year	$ (202)	(793)
Balance as of end-of-period		$ (202)