Future Policy Benefits - Summary of Undiscounted and Discounted Expected Future Gross Premiums and Expected Future Benefit Payments (Detail) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Long-term Care Insurance
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]
Liability for future policy benefit expected future gross premium undiscounted before reinsurance		$ 40,968	$ 42,329	$ 45,334
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance		128,048	130,315	133,974
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance		27,693	28,278	36,642
Liability for future policy benefit, expected future policy benefit discounted before reinsurance		61,938	61,352	85,338	$ 89,645
Life Insurance
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]
Liability for future policy benefit expected future gross premium undiscounted before reinsurance		11,158	11,541	12,266
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance		7,516	7,924	8,652
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance		6,411	6,559	8,853
Liability for future policy benefit, expected future policy benefit discounted before reinsurance	[1]	5,290	5,556	7,157	7,821
Fixed annuities
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]
Liability for future policy benefit expected future gross premium undiscounted before reinsurance		0	0	0
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance		24,453	24,924	26,473
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance		0	0	0
Liability for future policy benefit, expected future policy benefit discounted before reinsurance		$ 11,905	$ 11,923	$ 17,039	$ 18,637

[1] The components of the life insurance rollforward exclude flooring.