Changes in Policyholders' Account Balances (Details) - Investment contract reserves: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Deferred Fixed Annuity
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	$ 711	$ 756	$ 734	$ 763
Premiums received	15	5	25	11
Policy charges	0	0	0	0
Surrenders and withdrawals	(32)	(8)	(68)	(20)
Benefit payments	(3)	(4)	(6)	(10)
Interest credited	5	6	11	11
Balance, end of period	$ 696	$ 755	$ 696	$ 755
Weighted average crediting rate	3.41%	3.06%	3.41%	3.06%
Net amount at risk	$ 0	$ 0	$ 0	$ 0
Cash surrender value	691	750	691	750
Universal life
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	458	456	457	454
Premiums received	9	10	20	21
Policy charges	(10)	(9)	(20)	(19)
Surrenders and withdrawals	(4)	(2)	(7)	(5)
Benefit payments	(2)	(2)	(4)	(3)
Interest credited	5	4	10	9
Balance, end of period	$ 456	$ 457	$ 456	$ 457
Weighted average crediting rate	4.29%	4.25%	4.29%	4.25%
Net amount at risk	$ 4,030	$ 4,141	$ 4,030	$ 4,141
Cash surrender value	$ 423	$ 422	$ 423	$ 422