Claim and Claim Adjustment Expense Reserves (Life & Group Policyholder Reserves) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Liability for Claims and Claims Adjustment Expense [Abstract]
Liability for unpaid claims and claims adjustment expense, long term care policies, period decrease	$ 25	$ 40
Liability for unpaid claims and claims adjustment expense, incurred but not reported (IBNR) claims, amount	107
Liability for unpaid claims and claims adjustment expense, claim severity adjustment, period decrease	82
Liability for unpaid claims and claims adjustment expense structured settlement obligations period increase (decrease)	5	(2)
Liability for future policy benefits gross premium valuation pretax margin	$ 125	$ 72