Changes in Policyholders' Account Balances (Details) - Investment contract reserves: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Deferred Fixed Annuity
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	$ 696	$ 755	$ 734	$ 763
Premiums received	13	12	38	23
Policy charges	0	0	0	0
Surrenders and withdrawals	(32)	(17)	(100)	(37)
Benefit payments	(3)	(3)	(9)	(13)
Interest credited	6	5	17	16
Balance, end of period	$ 680	$ 752	$ 680	$ 752
Weighted average crediting rate	3.45%	3.10%	3.45%	3.10%
Net amount at risk	$ 0	$ 0	$ 0	$ 0
Cash surrender value	675	748	675	748
Universal life
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	456	457	457	454
Premiums received	8	8	28	29
Policy charges	(9)	(10)	(29)	(29)
Surrenders and withdrawals	(2)	(4)	(9)	(9)
Benefit payments	(1)	(1)	(5)	(4)
Interest credited	4	5	14	14
Balance, end of period	$ 456	$ 455	$ 456	$ 455
Weighted average crediting rate	4.29%	4.24%	4.29%	4.24%
Net amount at risk	$ 3,989	$ 4,108	$ 3,989	$ 4,108
Cash surrender value	$ 424	$ 421	$ 424	$ 421