Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Assets and Other Liabilities [Abstract]
Accrued interest and other non-finance receivables	$ 815	$ 666
Property, Plant and Equipment, Net	300	283
Collateral held for resale, at net realizable value, and other inventory	382	392
Deferred charges - income taxes	385	178
Prepaid Reinsurance Premiums and Other Reinsurance Recoverables	905	876
Operating lease assets	41	40
Investment in non-consolidated affiliates	191	182
Other	332	350
Other assets	3,444	3,055
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	462	448
Unearned Premiums and Fees	1,029	995
Interest Payable	1,132	1,098
Taxes Payable	155	131
Employee-related Liabilities	71	86
Operating Lease, Liability	43	42
Other Liabilities	2,714	2,627
Related Party Transactions Income Taxes and Related Interest Payable	3	9
Other Liabilities, Miscellaneous	284	275
Restricted Cash	93	88
Related Party Transactions Income Taxes and Related Interest Receivable	42	0
Property Subject to Operating Lease [Member]
Other Assets and Other Liabilities [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 3,850	$ 3,735