Fair Value Measurements Fair Value, Information about Fair Value Measurements using Significant Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified	Mar. 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	$ 103	$ 115
Financial Services [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	1,270	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	103	115
Financial Services [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	99	137
Financial Services [Member] | Other Derivatives [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	99	137
Financial Services [Member] | Other Derivatives [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	99	137
Automotive [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	129	218
Automotive [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	3	19
Automotive [Member] | Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	14	2
Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(44)
Derivative Assets	3	1
Minimum [Member] | Financial Services [Member] | Other Derivatives [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	85
Minimum [Member] | Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(45)
Maximum [Member] | Financial Services [Member] | Other Derivatives [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets	112
Maximum [Member] | Automotive [Member] | Commodity Contract [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	(43)
North America [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	68	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	68	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	66	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	66	70
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	54
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	66
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
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
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
International [Member] | Financial Services [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Quantitative Information [Line Items]
Financing Receivable Fair Value Disclosure	35	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	35	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	35	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	35	39
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	28
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	$ 42