Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Other Assets and Other Liabilities [Abstract]
Accrued interest and other non-finance receivables	$ 875		$ 898
Collateral held for resale, at net realizable value, and other inventory	994		843
Prepaid Reinsurance Premiums and Other Reinsurance Recoverables	695		687
Deferred charges - income taxes	153		171
Property and equipment, net of accumulated depreciation	212		212
Operating lease assets	107		108
Investment in non-consolidated affiliates	(122)		(132)
Other	377		347
Total other assets	3,535	$ 3,390	3,398
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	404		393
Unearned Premiums and Fees	811		806
Interest Payable	739		888
Taxes Payable	173		433
Deferred Revenue	95		110
Operating Lease, Liability	109		110
Other Liabilities	2,174		2,633
Related Party Transactions Income Taxes and Related Interest Payable	38		294
Other Liabilities, Miscellaneous	247		286
Accounting Standards Update 2016-13 [Member]
Other Assets and Other Liabilities [Abstract]
Investment in non-consolidated affiliates		8
Total other assets		$ (8)
Property Subject to Operating Lease [Member]
Other Assets and Other Liabilities [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 6,275		$ 5,772