Liability for Future Policy Benefit (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Term Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 1,664	$ 1,723	$ 1,643	$ 1,801
Beginning balance at original discount rate					$ 1,712	$ 1,708	$ 1,704	$ 1,503
Effect of changes in cash flow assumptions					0	(5)	(13)	132
Effect of actual variances from expected experience					(3)	(15)	(3)	5
Adjusted beginning of period balance	1,709	1,688	1,688	1,640
Issuances	33	50	111	154
Interest accrual	18	17	53	49
Net premiums collected	(45)	(44)	(137)	(132)
Ending balance at original discount rate	1,715	1,711	1,715	1,711
Effect of changes in discount rate assumptions	(133)	(94)	(133)	(94)
Balance, end of period	1,582	1,617	1,582	1,617
Present value of expected future policy benefits:
Balance, beginning of period	2,662	2,702	2,584	2,993
Beginning balance at original discount rate					2,737	2,692	2,663	2,425
Effect of changes in cash flow assumptions					0	5	(12)	150
Effect of actual variances from expected experience					(6)	(19)	(2)	15
Adjusted beginning of period balance	2,731	2,649	2,678	2,590
Issuances	33	49	111	153
Interest accrual	30	29	90	84
Benefits paid	(39)	(48)	(124)	(148)
Ending balance at original discount rate	2,755	2,679	2,755	2,679
Effect of changes in discount rate assumptions	(234)	(159)	(234)	(159)
Balance, end of period	2,521	2,520	2,521	2,520
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	939	903	939	903
Impact of flooring at cohort level	17	22	17	22
Net life policy reserves	956	925	956	925
Less reinsurance recoverable at original discount rate	(99)	(98)	(99)	(98)
Less effect of discount rate assumption changes on reinsurance recoverable	(7)	(9)	(7)	(9)
Net life policy reserves, after reinsurance recoverable	$ 850	$ 818	$ 850	$ 818
Weighted-average duration of the net life policy reserves in years	11 years	11 years	11 years	11 years
Whole Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 212	$ 210	$ 208	$ 241
Beginning balance at original discount rate					219	217	209	201
Effect of changes in cash flow assumptions					(1)	(7)	(2)	(3)
Effect of actual variances from expected experience					2	3	0	0
Adjusted beginning of period balance	220	207	213	198
Issuances	7	11	24	30
Interest accrual	3	2	7	6
Net premiums collected	(7)	(6)	(21)	(20)
Ending balance at original discount rate	223	214	223	214
Effect of changes in discount rate assumptions	(17)	(13)	(17)	(13)
Balance, end of period	206	201	206	201
Present value of expected future policy benefits:
Balance, beginning of period	633	646	614	826
Beginning balance at original discount rate					615	607	590	577
Effect of changes in cash flow assumptions					0	(10)	(2)	(5)
Effect of actual variances from expected experience					$ 2	$ 3	$ 0	$ 0
Adjusted beginning of period balance	617	588	600	572
Issuances	7	11	24	29
Interest accrual	8	7	23	22
Benefits paid	(9)	(7)	(24)	(24)
Ending balance at original discount rate	623	599	623	599
Effect of changes in discount rate assumptions	(37)	(5)	(37)	(5)
Balance, end of period	586	594	586	594
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	380	393	380	393
Impact of flooring at cohort level	1	2	1	2
Net life policy reserves	381	395	381	395
Less reinsurance recoverable at original discount rate	(25)	(25)	(25)	(25)
Less effect of discount rate assumption changes on reinsurance recoverable	(3)	(4)	(3)	(4)
Net life policy reserves, after reinsurance recoverable	$ 353	$ 366	$ 353	$ 366
Weighted-average duration of the net life policy reserves in years	16 years	16 years	16 years	16 years