Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Other Assets and Liabilities [Line Items]
Related Party Transactions Income Taxes and Related Interest Payable	$ 94	$ 99
Other Assets [Abstract]
Accrued interest and other non-finance receivables	1,075	1,117
Collateral held for resale, at net realizable value, and other inventory	740	780
Prepaid reinsurance premiums and other reinsurance recoverables	651	611
Deferred charges - income taxes	225	247
Property and equipment, net of accumulated depreciation	187	177
Deferred charges	95	127
Restricted cash	147	124
Investment in non-consolidated affiliates	117	107
Other	80	39
Total other assets	3,317	3,329
Accumulated depreciation	361	354
Other Liabilities and Deferred Income [Abstract]
Unearned insurance premiums and fees	769	723
Interest payable	572	722
Taxes Payable	290	301
Deferred revenue	103	148
Payroll and employee benefits	70	68
Other	235	310
Total other liabilities and deferred income	2,039	2,272
Deferred Revenue, Admission Fees	76	124
Cost Method Investments	$ 9	$ 7