Fair Value Measurements - Fair Value, Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
North America Segment [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 57	$ 76
North America Segment [Member] | Level 3 [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	57	76
Retail [Member] | North America Segment [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55	70
Retail [Member] | North America Segment [Member] | Level 3 [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55	70
Retail [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55
Retail [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	44
Retail [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55
Retail [Member] | International Segment [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
Retail [Member] | International Segment [Member] | Level 3 [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
Retail [Member] | International Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27
Retail [Member] | International Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	22
Retail [Member] | International Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	33
Dealer Loans [Member] | North America Segment [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2	6
Dealer Loans [Member] | North America Segment [Member] | Level 3 [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2	6
Dealer Loans [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2
Dealer Loans [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2
Dealer Loans [Member] | North America Segment [Member] | Level 3 [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 4