Other Assets and Other Liabilities and Deferred Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016
Schedule of Other Assets and Liabilities [Line Items]
Related Party Transactions Income Taxes and Related Interest Payable	$ 99		$ 96
Other Assets [Abstract]
Accrued interest and other non-finance receivables	1,117		889
Collateral held for resale, at net realizable value, and other inventory	780		621
Prepaid reinsurance premiums and other reinsurance recoverables	611		546
Deferred charges - income taxes	247		205
Property and equipment, net of accumulated depreciation	177		156
Deferred charges	127		122
Restricted cash	124		108
Investment in non-consolidated affiliates	107		153
Other	39		22
Total other assets	3,329		2,822
Accumulated depreciation	354		347
Other Liabilities and Deferred Income [Abstract]
Unearned insurance premiums and fees	723		650
Interest payable	722		661
Taxes Payable	301		294
Deferred revenue	148		143
Payroll and employee benefits	68		51
Other	310		198
Total other liabilities and deferred income	2,272		1,997
Deferred Revenue, Admission Fees	124	$ 120	$ 120
Admission Fee Revenue	$ 27