Reserves for Insurance Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Total gross reserves for insurance losses and loss adjustment expenses, beginning balance			$ 140	$ 119
Less: Reinsurance recoverable			66	72
Net reserves for insurance losses and loss adjustment expenses	$ 104	$ 80	104	80	$ 74	$ 47
Current year			281	218
Prior years			12	4
Total net insurance losses and loss adjustment expenses incurred	181	134	293	222
Current year			(207)	(154)
Prior years			(56)	(35)
Total net insurance losses and loss adjustment expenses paid or payable			(263)	(189)
Plus: Reinsurance recoverable	99	72	99	72
Total gross reserves for insurance losses and loss adjustment expenses, ending balance	$ 203	$ 152	$ 203	$ 152