Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	Jun. 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	1,055	1,117
Collateral held for resale, at net realizable value, and other inventory	634	780
Prepaid reinsurance premiums and other reinsurance recoverables	639	611
Deferred charges - income taxes	224	247
Property and equipment, net of accumulated depreciation	182	177
Deferred charges	110	127
Restricted cash	146	124
Investment in non-consolidated affiliates	133	107
Other	56	39
Total other assets	3,179	3,329
Accumulated depreciation	364	354
Other Liabilities and Deferred Income [Abstract]
Unearned insurance premiums and fees	754	723
Interest payable	721	722
Taxes Payable	323	301
Deferred revenue	122	148
Payroll and employee benefits	51	68
Other	311	310
Total other liabilities and deferred income	2,282	2,272
Deferred Revenue, Admission Fees	96	124
Cost Method Investments	$ 9	$ 7