Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves (Life & Group Policyholder Reserves) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense [Abstract]
Liability for unpaid claims and claims adjustment expense, long term care policies, period increase (decrease)	$ (25)	$ (40)
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	$ 125