Fair Value Measurements Fair Values And Related Carrying Values of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accounts receivable, net	$ 5,437	$ 5,793
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, net	650	792
Debt, excluding capital lease obligations	(10,988)	(12,136)
Accounts payable	(9,152)	(8,406)
Residual value and credit guarantees	(3)	(8)
Contingent repurchase commitments	(5)	(7)
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accounts receivable, net	5,454	5,690
Notes receivable, net	710	836
Debt, excluding capital lease obligations	(13,258)	(14,099)
Accounts payable	(9,148)	(8,396)
Residual value and credit guarantees	(2)	(9)
Contingent repurchase commitments	(7)	(4)
Level 2 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accounts receivable, net	5,454
Notes receivable, net	710
Debt, excluding capital lease obligations	(13,189)
Accounts payable	(9,148)
Level 3 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, excluding capital lease obligations	(69)
Residual value and credit guarantees	(2)
Contingent repurchase commitments	$ (7)

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Amounts due from customers or clients for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, as well as any other amounts due from others, including related parties, which may be included in accounts receivable as categorized on the statement of financial position.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents commitments outstanding as of the balance sheet date which obligate or represent potential claims against the assets of the Company relating to, for example, the extension of credit. Further, commitments generally represent off balance sheet arrangements that obligate the entity to deliver assets or services or enter into another obligation in the future.

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- Definition

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