Fair Value Measurements - Nonrecurring (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
International Segment [Member] | Retail [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	$ 27		$ 27		$ 39
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(6)	(3)	(11)	(11)
International Segment [Member] | Retail [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
International Segment [Member] | Retail [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
International Segment [Member] | Retail [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	27		27		39
North America Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	57		57		76
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(6)	(8)	(14)	(19)
North America Segment [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	57		57		76
North America Segment [Member] | Retail [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	55		55		70
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(6)	(8)	(14)	(19)
North America Segment [Member] | Retail [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Retail [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Retail [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	55		55		70
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	2		2		6
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0	0	0	0
North America Segment [Member] | Dealer Loans [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Dealer Loans [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	0		0		0
North America Segment [Member] | Dealer Loans [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable Fair Value Disclosure	$ 2		$ 2		$ 6