Reserves for Insurance Losses and Loss Adjustment Expenses (Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]
Reserves for insurance losses and allocated loss adjustment expenses, net of reinsurance	$ 44	$ 39	$ 37
Total reinsurance recoverable on unpaid claims	72	81	90	$ 88
Unallocated loss adjustment expenses	3	2	2
Reserves for insurance losses and loss adjustment expenses	$ 119	$ 122	$ 129	$ 122