Liability for Future Policy Benefit (Details) - Life Policy Reserves - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Term Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 1,643	$ 1,801	$ 1,935
Beginning balance at original discount rate	1,708	1,503	1,503
Effect of changes in cash flow assumptions	(7)	123	(177)
Effect of actual variances from expected experience	(20)	(1)	28
Adjusted beginning of period balance	1,681	1,625	1,354
Issuances	143	194	248
Interest accrual	72	65	62
Net premiums collected	(184)	(176)	(161)
Ending balance at original discount rate	1,712	1,708	1,503
Effect of changes in discount rate assumptions	(12)	(65)	298
Balance, end of period	1,700	1,643	1,801
Present value of expected future policy benefits:
Balance, beginning of period	2,584	2,993	3,222
Beginning balance at original discount rate	2,692	2,425	2,418
Effect of changes in cash flow assumptions	2	140	(181)
Effect of actual variances from expected experience	(24)	8	31
Adjusted beginning of period balance	2,670	2,573	2,268
Issuances	143	194	248
Interest accrual	121	112	109
Benefits paid	(169)	(187)	(200)
Ending balance at original discount rate	2,765	2,692	2,425
Effect of changes in discount rate assumptions	(14)	(108)	568
Balance, end of period	2,751	2,584	2,993
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	1,051	941	1,192
Impact of flooring at cohort level	15	20	14
Net life policy reserves	1,066	961	1,206
Less reinsurance recoverable at original discount rate	(97)	(99)	(107)
Less effect of discount rate assumption changes on reinsurance recoverable	(10)	(9)	(19)
Net life policy reserves, after reinsurance recoverable	$ 959	$ 853	$ 1,080
Weighted-average duration of the net life policy reserves	11 years	11 years	12 years
Whole Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 208	$ 241	$ 234
Beginning balance at original discount rate	217	201	182
Effect of changes in cash flow assumptions	(7)	(5)	(3)
Effect of actual variances from expected experience	3	0	2
Adjusted beginning of period balance	213	196	181
Issuances	31	40	39
Interest accrual	9	8	8
Net premiums collected	(28)	(27)	(27)
Ending balance at original discount rate	225	217	201
Effect of changes in discount rate assumptions	(2)	(9)	40
Balance, end of period	223	208	241
Present value of expected future policy benefits:
Balance, beginning of period	614	826	843
Beginning balance at original discount rate	607	577	545
Effect of changes in cash flow assumptions	(10)	(7)	(4)
Effect of actual variances from expected experience	3	(1)	2
Adjusted beginning of period balance	600	569	543
Issuances	30	40	39
Interest accrual	31	29	29
Benefits paid	(33)	(31)	(34)
Ending balance at original discount rate	628	607	577
Effect of changes in discount rate assumptions	29	7	249
Balance, end of period	657	614	826
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	434	406	585
Impact of flooring at cohort level	0	2	0
Net life policy reserves	434	408	585
Less reinsurance recoverable at original discount rate	(23)	(25)	(27)
Less effect of discount rate assumption changes on reinsurance recoverable	(5)	(5)	(15)
Net life policy reserves, after reinsurance recoverable	$ 406	$ 378	$ 543
Weighted-average duration of the net life policy reserves	16 years	16 years	18 years