Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Present Value of Expected LFPB
Net balance as of end-of-year	$ 39,864	$ 38,826
Payout Annuities
Present Value of Expected Net Premiums
Balance as of beginning-of-period	0	0
Beginning balance of 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 of original discount rate	0	0
Effect of cumulative changes in discount rate assumptions	0	0
Balance as of beginning-of-period	0	0
Present Value of Expected LFPB
Balance as of beginning-of-year	2,004	2,512
Beginning balance of original discount rate	2,267	2,246
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		1	3
Adjusted balance as of beginning-of-year	2,268	2,249
Issuances	109	122
Interest accrual	86	84
Benefit payments	(191)	(188)
Ending balance of original discount rate	2,272	2,267
Effect of cumulative changes in discount rate assumptions	(187)	(263)
Balance as of end-of-year	2,085	2,004
Net balance as of end-of-year	2,085	2,004
Less: reinsurance recoverables (2)	1,617	3
Net balance as of end-of-year, net of reinsurance	$ 468	$ 2,001
Weighted-average duration of future policyholder benefit liability	9 years	9 years
Deferred profit liability	$ 56	$ 38	22
Payout Annuities | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected Net Premiums
Balance as of beginning-of-period	0	0
Balance as of beginning-of-period		0
Present Value of Expected LFPB
Balance as of beginning-of-year	(263)	266
Balance as of end-of-year		(263)
Traditional Life
Present Value of Expected Net Premiums
Balance as of beginning-of-period	6,063	6,858
Beginning balance of original discount rate	6,645	5,975
Effect of changes in cash flow assumptions		(12)	(484)
Effect of actual variances from expected experience		(303)	50
Adjusted balance as of beginning-of-year	6,330	5,541
Issuances	579	1,656
Interest accrual	244	222
Net premiums collected	(804)	(765)
Flooring impact of LFPB	(1)	(9)
Ending balance of original discount rate	6,348	6,645
Effect of cumulative changes in discount rate assumptions	(148)	(582)
Balance as of beginning-of-period	6,200	6,063
Present Value of Expected LFPB
Balance as of beginning-of-year	9,572	11,008
Beginning balance of original discount rate	10,357	9,447
Effect of changes in cash flow assumptions		(29)	(415)
Effect of actual variances from expected experience		(333)	69
Adjusted balance as of beginning-of-year	9,995	9,101
Issuances	580	1,655
Interest accrual	387	356
Benefit payments	(732)	(755)
Ending balance of original discount rate	10,230	10,357
Effect of cumulative changes in discount rate assumptions	(189)	(785)
Balance as of end-of-year	10,041	9,572
Net balance as of end-of-year	3,841	3,509
Less: reinsurance recoverables (2)	445	532
Net balance as of end-of-year, net of reinsurance	$ 3,396	$ 2,977
Weighted-average duration of future policyholder benefit liability	9 years	10 years
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected Net Premiums
Balance as of beginning-of-period	$ (582)	$ 883
Balance as of beginning-of-period		(582)
Present Value of Expected LFPB
Balance as of beginning-of-year	(785)	1,561
Balance as of end-of-year		(785)
Group Protection
Present Value of Expected LFPB
Balance as of beginning-of-year	5,462	5,936
Beginning balance of original discount rate	6,059	5,674
Effect of changes in cash flow assumptions		(27)	15
Effect of actual variances from expected experience		(261)	(117)
Adjusted balance as of beginning-of-year	5,771	5,572
Issuances	1,702	1,777
Interest accrual	159	141
Benefit payments	(1,453)	(1,431)
Ending balance of original discount rate	6,179	6,059
Effect of cumulative changes in discount rate assumptions	(490)	(597)
Balance as of end-of-year	5,689	5,462
Net balance as of end-of-year	5,689	5,462
Less: reinsurance recoverables (2)	123	127
Net balance as of end-of-year, net of reinsurance	$ 5,566	$ 5,335
Weighted-average duration of future policyholder benefit liability	5 years	4 years
Group Protection | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected LFPB
Balance as of beginning-of-year	$ (597)	$ 262
Balance as of end-of-year		(597)
UL and Other
Present Value of Expected LFPB
Balance as of beginning-of-year	14,818	12,556
Balance as of beginning-of-year, excluding shadow balance in AOCI	15,723	11,443
Effect of changes in cash flow assumptions		173	3,108
Effect of actual variances from expected experience		(71)	$ 195
Adjusted balance as of beginning-of-year	15,825	14,746
Issuances	0	7
Interest accrual	775	626
Net assessments collected	1,210	972
Benefit payments	(588)	(628)
Balance as of end-of-year, excluding shadow balance in AOCI	17,222	15,723
Balance as of end-of-year	15,000	14,818
Net balance as of end-of-year	15,000	14,818
Less: reinsurance recoverables (2)	4,708	856
Net balance as of end-of-year, net of reinsurance	$ 10,292	$ 13,962
Weighted-average duration of future policyholder benefit liability	17 years	17 years
UL and Other | Cumulative Effect, Period of Adoption, Adjustment
Present Value of Expected LFPB
Balance as of beginning-of-year	$ (905)	$ 1,113
Balance as of end-of-year	$ (2,222)	$ (905)