Fair Value Measurements - Nonrecurring (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
North America Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	$ 37	$ 54
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(13)	(14)	(23)
North America Segment [Member] | Retail [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	37	52
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(12)	(13)	(23)
North America Segment [Member] | Dealer Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0	2
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(1)	(1)	0
International Segment [Member] | Retail [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	24	26
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (7)	$ (11)	$ (14)