Fair Value Measurements - Non Recurring (Details) (Financial Services [Member], Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Items measured at fair value [Line Items]
Finance receivables	$ 135		$ 135		$ 149
Total Gains / (Losses)	(12)	(18)	(27)	(43)
Level 1
Items measured at fair value [Line Items]
Finance receivables
Level 1 | North America
Items measured at fair value [Line Items]
Finance receivables
Level 1 | North America | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables
Level 1 | North America | Dealer loans
Items measured at fair value [Line Items]
Finance receivables
Level 1 | International
Items measured at fair value [Line Items]
Finance receivables
Level 1 | International | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables
Level 2
Items measured at fair value [Line Items]
Finance receivables	3		3
Level 2 | North America
Items measured at fair value [Line Items]
Finance receivables	3		3
Level 2 | North America | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables
Level 2 | North America | Dealer loans
Items measured at fair value [Line Items]
Finance receivables	3		3
Level 2 | International
Items measured at fair value [Line Items]
Finance receivables
Level 2 | International | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables
Level 3
Items measured at fair value [Line Items]
Finance receivables	132		132		149
Level 3 | North America
Items measured at fair value [Line Items]
Finance receivables	86		86		104
Level 3 | North America | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables	76		76		82
Level 3 | North America | Dealer loans
Items measured at fair value [Line Items]
Finance receivables	10		10		22
Level 3 | International
Items measured at fair value [Line Items]
Finance receivables	46		46		45
Level 3 | International | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables	46		46		45
North America
Items measured at fair value [Line Items]
Finance receivables	89		89		104
Total Gains / (Losses)	(7)	(9)	(17)	(23)
North America | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables	76		76		82
Total Gains / (Losses)	(6)	(8)	(16)	(19)
North America | Dealer loans
Items measured at fair value [Line Items]
Finance receivables	13		13		22
Total Gains / (Losses)	(1)	(1)	(1)	(4)
International
Items measured at fair value [Line Items]
Finance receivables	46		46		45
Total Gains / (Losses)	(5)	(9)	(10)	(20)
International | Retail [Member]
Items measured at fair value [Line Items]
Finance receivables	46		46		45
Total Gains / (Losses)	$ (5)	$ (9)	$ (10)	$ (20)