Policyholder Account Balances, Future Policy Benefits and Claims - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefits, decrease for assumption updates	$ 10
Decrease to reinsurance recoverable for assumption updates	$ 4
Reinsurance recoverables		$ 4,200	$ 4,200
Genworth LTC risk
Liability for Future Policy Benefit, Activity [Line Items]
Reinsurance recoverables		$ 2,700	$ 2,700