Restricted Cash (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	$ 2,055	$ 1,941
Revolving Credit Facility [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	321	345
Securitization Notes Payable [Member] | Retail Finance Receivables [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	1,682	1,531
Other [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	$ 52	$ 65