Input Hierarchy of Items Measured at Fair Value on a Nonrecurring Basis (Details) (Financial Services [Member], Fair Value, Measurements, Nonrecurring [Member], Level 3 [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	$ 64	$ 80
North America [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	41	54
North America [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	41	52
North America [Member] | Dealer loans [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure		2
International [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	23	26
International [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	$ 23	$ 26