Fair Value Measurements (Fair Values And Related Carrying Values Of Financial Instruments That Are Not Required To Be Remeasured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accounts receivable, net	$ 5,793	$ 5,422
Notes receivable, net	792	480
Debt, excluding capital lease obligations	(12,136)	(12,234)
Accounts payable	(8,406)	(7,715)
Residual value and credit guarantees	(8)	(12)
Contingent repurchase commitments	(7)	(7)
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accounts receivable, net	5,690	5,283
Notes receivable, net	836	501
Debt, excluding capital lease obligations	(14,099)	(13,525)
Accounts payable	(8,396)	(7,704)
Residual value and credit guarantees	(9)	(11)
Contingent repurchase commitments	$ (4)	$ (84)

Fair Value Measurements (Fair Values And Related Carrying Values Of Financial Instruments That Are Not Required To Be Remeasured At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2011

Dec. 31, 2010

Carrying Value [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Accounts receivable, net

$ 5,793

$ 5,422

Notes receivable, net

792

480

Debt, excluding capital lease obligations

(12,136)

(12,234)

Accounts payable

(8,406)

(7,715)

Residual value and credit guarantees

(8)

(12)

Contingent repurchase commitments

(7)

Fair Value [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Accounts receivable, net

5,690

5,283

Notes receivable, net

836

501

Debt, excluding capital lease obligations

(14,099)

(13,525)

Accounts payable

(8,396)

(7,704)

Residual value and credit guarantees

(9)

(11)

Contingent repurchase commitments

$ (4)

$ (84)

- Definition

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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. 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.

+ References+ Details

- 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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