Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Other Assets and Liabilities [Line Items]
Related Party Transactions Income Taxes and Related Interest Payable	$ 103	$ 99
Other Assets [Abstract]
Accrued interest and other non-finance receivables	1,059	1,117
Collateral held for resale, at net realizable value, and other inventory	755	780
Prepaid reinsurance premiums and other reinsurance recoverables	624	611
Deferred charges - income taxes	239	247
Property and equipment, net of accumulated depreciation	181	177
Deferred charges	126	127
Restricted cash	148	124
Investment in non-consolidated affiliates	126	107
Other	43	39
Total other assets	3,301	3,329
Accumulated depreciation	363	354
Other Liabilities and Deferred Income [Abstract]
Unearned insurance premiums and fees	736	723
Interest payable	608	722
Taxes Payable	297	301
Deferred revenue	150	148
Payroll and employee benefits	45	68
Other	318	310
Total other liabilities and deferred income	2,154	2,272
Deferred Revenue, Admission Fees	124	124
Cost Method Investments	$ 9	$ 7