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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
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	$ 49	$ 42	49	42	$ 41	$ 39
Net insurance losses and loss adjustment expenses, current year			220	207
Net insurance losses and loss adjustment expenses, prior years			(3)	(1)
Total net insurance losses and loss adjustment expenses incurred	70	69	217	206
Net insurance losses and loss adjustment expenses paid or payable, current year			(183)	(174)
Net insurance losses and loss adjustment expenses paid or payable, prior years			(26)	(29)
Total net insurance losses and loss adjustment expenses paid or payable			(209)	(203)
Reinsurance recoverable	73	83	73	83
Gross reserves for insurance losses and loss adjustment expenses, ending balance	$ 122	$ 125	$ 122	$ 125