Fair Value Measurements Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 84	$ 115
Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	84	115
North America [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	57	76
North America [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	57	76
North America [Member] | Retail [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55	70
North America [Member] | Retail [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55	70
North America [Member] | Dealer loans [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2	6
North America [Member] | Dealer loans [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2	6
International [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
International [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
International [Member] | Retail [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
International [Member] | Retail [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27	39
Income Approach Valuation Technique [Member] | Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(31)
Income Approach Valuation Technique [Member] | Minimum [Member] | Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(32)
Income Approach Valuation Technique [Member] | Maximum [Member] | Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(30)
Income Approach Valuation Technique [Member] | North America [Member] | Retail [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55
Income Approach Valuation Technique [Member] | North America [Member] | Retail [Member] | Minimum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	44
Income Approach Valuation Technique [Member] | North America [Member] | Retail [Member] | Maximum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	55
Income Approach Valuation Technique [Member] | North America [Member] | Dealer loans [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2
Income Approach Valuation Technique [Member] | North America [Member] | Dealer loans [Member] | Minimum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	2
Income Approach Valuation Technique [Member] | North America [Member] | Dealer loans [Member] | Maximum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	4
Income Approach Valuation Technique [Member] | International [Member] | Retail [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	27
Income Approach Valuation Technique [Member] | International [Member] | Retail [Member] | Minimum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	22
Income Approach Valuation Technique [Member] | International [Member] | Retail [Member] | Maximum [Member] | Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 33