Fair Value Measurements Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (Level 3 [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 64	$ 80
North America [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	41	54
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	41	52
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
International [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	23	26
International [Member] | Retail [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	23	26
Income Approach Valuation Technique [Member] | Automotive [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(11)	(8)
Income Approach Valuation Technique [Member] | Minimum [Member] | Automotive [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(10)	(7)
Income Approach Valuation Technique [Member] | Maximum [Member] | Automotive [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Net commodity contracts	(11)	(8)
Income Approach Valuation Technique [Member] | 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	41	52
Income Approach Valuation Technique [Member] | North America [Member] | Retail [Member] | Minimum [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	28	38
Income Approach Valuation Technique [Member] | North America [Member] | Retail [Member] | Maximum [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	41	52
Income Approach Valuation Technique [Member] | 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
Income Approach Valuation Technique [Member] | North America [Member] | Dealer loans [Member] | Minimum [Member] | Financial Services [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] | 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] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	23	26
Income Approach Valuation Technique [Member] | International [Member] | Retail [Member] | Minimum [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	21	25
Income Approach Valuation Technique [Member] | International [Member] | Retail [Member] | Maximum [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	$ 25	$ 27