Policyholder Account Balances - Summary of Liabilities for Policyholder Account (Detail) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Policyholder Account Balance [Line Items]
Policyholder account balances		$ 15,922	$ 16,564
Death and other insurance benefits		2,638	2,566	$ 2,656
Indexed universal life embedded derivatives
Policyholder Account Balance [Line Items]
Policyholder account balances	[1]	15	15
Fixed indexed annuity embedded derivatives
Policyholder Account Balance [Line Items]
Policyholder account balances	[1]	180	202
Life Insurance
Policyholder Account Balance [Line Items]
Policyholder account balances		7,595	7,694	7,835	$ 8,105
Fixed Annuity
Policyholder Account Balance [Line Items]
Policyholder account balances		4,922	5,477	6,595	7,892
Variable Annuity
Policyholder Account Balance [Line Items]
Policyholder account balances		567	610	$ 652	$ 689
Other
Policyholder Account Balance [Line Items]
Other		5	0
Total investment contracts
Policyholder Account Balance [Line Items]
Policyholder account balances		13,084	13,781
Additional insurance liabilities
Policyholder Account Balance [Line Items]
Death and other insurance benefits	[2]	$ 2,638	$ 2,566

[1] See note 6 for additional information.

[2] Amount represents additional liabilities related to death or other insurance benefits that are recorded within policyholder account balances and are considered long-duration insurance contracts. See note 12 for additional information.