Fair Value Measurements Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 80	$ 115
Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	80	115
North America [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	54	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	54	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	52	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	52	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	26	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	26	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	26	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	26	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	(8)
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	(7)
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	(8)
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	52
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	38
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	52
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	1
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	3
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	26
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	25
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	$ 27