Future Policy Benefits Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Present value of future net premiums
Balance, January 1					$ 3,993	$ 4,735
Effect of changes in discount rate	$ 78	$ 246	$ 78	$ 246	(74)	(880)
Balance, January 1, at original locked in discount rate					3,919	3,855
Effect of changes in cash flow assumptions
Expect of actual variances from expected experience					(85)	(37)
Adjusted balance, January 1	3,712	3,698	3,712	3,698	3,834	3,818
Interest accrual			103	105
Net premiums: earned during period			(225)	(225)
Balance, end of period at original locked in discount rate	3,712	3,698	3,712	3,698
Effect of changes in discount rate	78	246	78	246	(74)	(880)
Balance, June 30	3,790	3,944	3,790	3,944
Present value of future benefits & expenses
Balance, January 1					17,472	22,745
Effect of changes in discount rate	307	1,329	307	1,329	(125)	(5,942)
Balance, January 1, at original locked in discount rate			17,347	16,803
Effect of changes in cash flow assumptions
Effect of actual variances from expected experience					(51)	(43)
Adjusted balance, January 1					17,296	16,760
Interest accrual			482	482
Benefit & expense payments			(629)	(470)
Balance, end of period at original locked in discount rate	17,149	16,772	17,149	16,772
Effect of changes in discount rate	307	1,329	307	1,329	(125)	$ (5,942)
Balance, June 30	17,456	18,101	17,456	18,101
Net LFPB	13,666	14,157	13,666	14,157	$ 13,480		$ 19,132
Re-measurement gain of insurance claims and policyholders’ benefits	$ (33)	$ 1	$ (34)	$ 6