Fair Value Measurements - Non Recurring (Details) (Financial Services [Member], Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	$ 103		$ 115
Total Gains / (Losses)	(16)	(17)
North America [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	68		76
Total Gains / (Losses)	(11)	(14)
North America [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	66		70
Total Gains / (Losses)	(11)	(14)
North America [Member] | Dealer loans [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	2		6
Total Gains / (Losses)	0	0
International [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	35		39
Total Gains / (Losses)	(5)	(3)
International [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	35		39
Total Gains / (Losses)	(5)	(3)
Level 1 [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 1 [Member] | North America [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 1 [Member] | North America [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 1 [Member] | North America [Member] | Dealer loans [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 1 [Member] | International [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 1 [Member] | International [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member] | North America [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member] | North America [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member] | North America [Member] | Dealer loans [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member] | International [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 2 [Member] | International [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure
Level 3 [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	103		115
Level 3 [Member] | North America [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	68		76
Level 3 [Member] | North America [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	66		70
Level 3 [Member] | North America [Member] | Dealer loans [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	2		6
Level 3 [Member] | International [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	35		39
Level 3 [Member] | International [Member] | Retail [Member]
Items measured at fair value [Line Items]
Financing Receivable Fair Value Disclosure	$ 35		$ 39