Reserves for Insurance Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for insurance losses and loss adjustment expenses, beginning balance			$ 119	$ 122
Less: Reinsurance recoverable			72	81
Net reserves for insurance losses and loss adjustment expenses	$ 68	$ 49	68	49	$ 47	$ 41
Current year			326	220
Prior years			3	(3)
Total net insurance losses and loss adjustment expenses incurred	107	70	329	217
Current year			(270)	(183)
Prior years			(38)	(26)
Total net insurance losses and loss adjustment expenses paid or payable			(308)	(209)
Plus: Reinsurance recoverable	77	73	77	73
Gross reserves for insurance losses and loss adjustment expenses, ending balance	$ 145	$ 122	$ 145	$ 122