Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Other Assets and Other Liabilities [Abstract]
Accrued interest and other non-finance receivables	$ 735	$ 677
Property, Plant and Equipment, Net	306	270
Collateral held for resale, at net realizable value, and other inventory	511	426
Deferred charges - income taxes	189	190
Prepaid Reinsurance Premiums and Other Reinsurance Recoverables	861	818
Operating lease assets	40	53
Investment in non-consolidated affiliates	191	167
Other	341	202
Other assets	3,282	2,940
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	446	453
Unearned Premiums and Fees	976	930
Interest Payable	1,152	963
Taxes Payable	133	186
Employee-related Liabilities	93	96
Operating Lease, Liability	42	55
Other Liabilities	2,670	2,459
Related Party Transactions Income Taxes and Related Interest Payable	6	62
Other Liabilities, Miscellaneous	274	229
Restricted Cash	108	137
Property Subject to Operating Lease [Member]
Other Assets and Other Liabilities [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 3,786	$ 3,850