Customer Financing (Change In The Allowance For Losses On Financing Receivables) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Customer Financing [Abstract]
Beginning balance - January 1	$ (353)	$ (302)	$ (269)
Customer financing valuation benefit/(provision)	269	(51)	(45)
Reduction in customer financing assets	14		12
Ending balance - December 31	(70)	(353)	(302)
Individually evaluated for impairment			2
Collectively evaluated for impairment	$ 70	$ 353	$ 300

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A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524

-Subparagraph (c)(1)

+ Details

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

+ Details

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

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- Definition

The increase (decrease) in the allowance for credit losses related to financing receivables.

+ References

+ Details

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- Definition

Charge to expense for financing receivables that are expected to be uncollectible.

+ References

+ Details

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