Customer Financing (Financing Receivable Balances Evaluated For Impairment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Customer Financing [Abstract]
Individually evaluated for impairment	$ 616	$ 854
Collectively evaluated for impairment	1,826	1,997
Total financing receivables	$ 2,442	$ 2,851

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Includes outstanding notes receivable and the net amount due as of the balance sheet date on direct financing and sales-type leases. Represents an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date.

+ References

No definition available.

+ Details

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524

+ Details

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

+ Details

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