Future Policy Benefit Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions	6 Months Ended
	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)	$ (74)		$ (880)
Balance, January 1, at original locked in discount rate	3,919	3,855
Effect of changes in cash flow assumptions			0		0
Expect of actual variances from expected experience			(85)		(37)
Adjusted balance, January 1			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
Effect of changes in discount rate	78	246	74		880
Balance, June 30	3,790	3,944
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, January 1	17,472	22,745
Effect of changes in discount rate	(307)	(1,329)	(125)		(5,942)
Balance, January 1, at original locked in discount rate	17,347	16,803
Effect of change in cash flow assumptions			0		0
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
Effect of changes in discount rate	307	1,329	125		$ 5,942
Balance, June 30	17,456	18,101
Net LFPB	$ 13,666	$ 14,157	$ 13,480	[1]		$ 19,132

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.