Liability for Future Policy Benefit (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Term Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 1,699	$ 1,686	$ 1,643	$ 1,801
Beginning balance at original discount rate					$ 1,715	$ 1,708	$ 1,542	$ 1,503
Effect of changes in cash flow assumptions					(5)	(5)	149	145
Effect of actual variances from expected experience					(9)	(12)	(3)	8
Adjusted beginning of period balance	1,701	1,688	1,691	1,656
Issuances	40	45	78	104
Interest accrual	17	17	35	32
Net premiums collected	(46)	(46)	(92)	(88)
Ending balance at original discount rate	1,712	1,704	1,712	1,704
Effect of changes in discount rate assumptions	(48)	19	(48)	19
Balance, end of period	1,664	1,723	1,664	1,723
Present value of expected future policy benefits:
Balance, beginning of period	2,691	2,745	2,584	2,993
Beginning balance at original discount rate					2,712	2,692	2,463	2,425
Effect of changes in cash flow assumptions					5	5	166	162
Effect of actual variances from expected experience					(11)	(13)	(1)	17
Adjusted beginning of period balance	2,706	2,628	2,684	2,604
Issuances	40	45	78	104
Interest accrual	30	28	60	55
Benefits paid	(39)	(38)	(85)	(100)
Ending balance at original discount rate	2,737	2,663	2,737	2,663
Effect of changes in discount rate assumptions	(75)	39	(75)	39
Balance, end of period	2,662	2,702	2,662	2,702
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	998	979	998	979
Impact of flooring at cohort level	17	20	17	20
Net life policy reserves	1,015	999	1,015	999
Less reinsurance recoverable at original discount rate	(100)	(104)	(100)	(104)
Less effect of discount rate assumption changes on reinsurance recoverable	(8)	(13)	(8)	(13)
Net life policy reserves, after reinsurance recoverable	$ 907	$ 882	$ 907	$ 882
Weighted-average duration of the net life policy reserves in years	12 years	12 years	12 years	12 years
Whole Life Insurance
Present value of expected net premiums:
Balance, beginning of period	$ 217	$ 226	$ 208	$ 241
Beginning balance at original discount rate					220	217	207	201
Effect of changes in cash flow assumptions					(6)	(6)	(1)	(1)
Effect of actual variances from expected experience					0	1	0	0
Adjusted beginning of period balance	214	206	212	200
Issuances	10	8	17	19
Interest accrual	2	2	4	4
Net premiums collected	(7)	(7)	(14)	(14)
Ending balance at original discount rate	219	209	219	209
Effect of changes in discount rate assumptions	(7)	1	(7)	1
Balance, end of period	212	210	212	210
Present value of expected future policy benefits:
Balance, beginning of period	644	736	614	826
Beginning balance at original discount rate					614	607	586	577
Effect of changes in cash flow assumptions					(10)	(10)	(3)	(3)
Effect of actual variances from expected experience					$ 0	$ 1	$ 0	$ 0
Adjusted beginning of period balance	604	583	598	574
Issuances	11	7	17	18
Interest accrual	7	8	15	15
Benefits paid	(7)	(8)	(15)	(17)
Ending balance at original discount rate	615	590	615	590
Effect of changes in discount rate assumptions	18	56	18	56
Balance, end of period	633	646	633	646
Net liability for future policy benefits:
Present value of expected future policy benefits less expected net premiums	421	436	421	436
Impact of flooring at cohort level	0	2	0	2
Net life policy reserves	421	438	421	438
Less reinsurance recoverable at original discount rate	(25)	(25)	(25)	(25)
Less effect of discount rate assumption changes on reinsurance recoverable	(5)	(7)	(5)	(7)
Net life policy reserves, after reinsurance recoverable	$ 391	$ 406	$ 391	$ 406
Weighted-average duration of the net life policy reserves in years	16 years	17 years	16 years	17 years