Reserves for Insurance Losses and Loss Adjustment Expenses (Rollforward of Reserves for Insurance Losses and Loss Adjustment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for insurance losses and loss adjustment expenses, beginning balance			$ 122	$ 129
Reinsurance recoverable			81	90
Net reserves for insurance losses and loss adjustment expenses, beginning balance			41	39
Net insurance losses and loss adjustment expenses, current year			151	136
Net insurance losses and loss adjustment expenses, prior years			(4)	1
Total net insurance losses and loss adjustment expenses incurred	$ 89	$ 74	147	137
Net insurance losses and loss adjustment expenses paid or payable, current year			(114)	(108)
Net insurance losses and loss adjustment expenses paid or payable, prior years			(24)	(27)
Total net insurance losses and loss adjustment expenses paid or payable			(138)	(135)
Net reserves for insurance losses and loss adjustment expenses, ending balance	50	41	50	41
Reinsurance recoverable	81	85	81	85
Gross reserves for insurance losses and loss adjustment expenses, ending balance	$ 131	$ 126	$ 131	$ 126