Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Other Assets and Other Liabilities [Abstract]
Accrued interest and other non-finance receivables	$ 737	$ 837
Collateral held for resale, at net realizable value, and other inventory	362	675
Prepaid Reinsurance Premiums and Other Reinsurance Recoverables	733	708
Deferred charges - income taxes	228	166
Property and equipment, net of accumulated depreciation	219	219
Operating lease assets	85	98
Investment in non-consolidated affiliates	143	132
Other	180	223
Other assets	2,830	3,705
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	382	365
Unearned Premiums and Fees	848	822
Interest Payable	654	857
Taxes Payable	261	121
Deferred Revenue	75	87
Operating Lease, Liability	89	100
Other Liabilities	2,170	2,280
Related Party Transactions Income Taxes and Related Interest Payable	136	16
Other Liabilities, Miscellaneous	243	293
Restricted Cash	143	647
Property Subject to Operating Lease [Member]
Other Assets and Other Liabilities [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 5,232	$ 5,840