Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves (International - Net prior year claim and allocated claim adjustment expense reserve development) (Details) - International - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Commercial	$ 0	$ (21)	$ (4)	$ (24)
Specialty	0	23	(1)	25
Other	0	1	0	1
Total pretax (favorable) unfavorable development	$ 0	$ 3	$ (5)	$ 2