Policyholder Account Balances, Future Policy Benefits and Claims - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Reinsurance recoverables	$ 4,000		$ 4,200
Long term care insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefits, increase (decrease) for assumption updates	(9)	$ (10)
Increase (Decrease) to reinsurance recoverable for assumption updates	(4)	(4)
Disability Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefits, increase (decrease) for assumption updates	(6)
Increase (Decrease) to reinsurance recoverable for assumption updates	(1)
Term and whole life insurance
Liability for Future Policy Benefit, Activity [Line Items]
Liability for future policy benefits, increase (decrease) for assumption updates	2	(9)
Increase (Decrease) to reinsurance recoverable for assumption updates	2	$ (16)
Genworth LTC risk
Liability for Future Policy Benefit, Activity [Line Items]
Reinsurance recoverables	$ 2,500		$ 2,700