Fair Value Measurements - Nonrecurring (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2013 North America Segment [Member]	Mar. 31, 2012 North America Segment [Member]	Mar. 31, 2013 North America Segment [Member] Level 3 [Member]	Dec. 31, 2012 North America Segment [Member] Level 3 [Member]	Mar. 31, 2013 North America Segment [Member] Retail [Member]	Mar. 31, 2012 North America Segment [Member] Retail [Member]	Mar. 31, 2013 North America Segment [Member] Retail [Member] Level 3 [Member]	Dec. 31, 2012 North America Segment [Member] Retail [Member] Level 3 [Member]	Mar. 31, 2013 North America Segment [Member] Dealer Loans [Member]	Mar. 31, 2012 North America Segment [Member] Dealer Loans [Member]	Mar. 31, 2013 North America Segment [Member] Dealer Loans [Member] Level 3 [Member]	Dec. 31, 2012 North America Segment [Member] Dealer Loans [Member] Level 3 [Member]	Mar. 31, 2013 International Segment [Member] Retail [Member]	Mar. 31, 2012 International Segment [Member] Retail [Member]	Mar. 31, 2013 International Segment [Member] Retail [Member] Level 3 [Member]	Dec. 31, 2012 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			$ 45	$ 54			$ 44	$ 52			$ 1	$ 2			$ 24	$ 26
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (22)	$ (11)			$ (21)	$ (11)			$ (1)	$ 0			$ (3)	$ (5)