Fair Value Measurements Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	$ 1,500
Financial Services [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	1,336	1,375
Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	89	115
Financial Services [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	1,336	1,375
Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	89	115
Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets		137
Automotive [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	131	218
Automotive [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	131	218
Automotive [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets		19
Automotive [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets	3	2
Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative financial instruments assets		1
North America [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	62	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	62	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	60	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	60	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	(78)
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	(79)
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	(77)
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	60
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	48
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	60
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	21
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	$ 32