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Fair Value (Instruments Not Measured at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Non-recourse debt	$ 15,411	$ 15,535
Recourse debt	5,962	6,485
Carrying Amount
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Long-term receivables	359	376
Non-recourse debt	15,411	15,535
Recourse debt	5,962	6,485
Fair Value
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Long-term receivables	243	359
Non-recourse debt	16,138	15,862
Recourse debt	6,628	6,640
Fair Value | Level 1
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Long-term receivables	0
Non-recourse debt	0
Recourse debt	0
Fair Value | Level 2
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Long-term receivables	0
Non-recourse debt	13,839
Recourse debt	6,628
Fair Value | Level 3
Financial Instruments Not Measured At Fair Value In the Condensed Consolidated Balance Sheets [Abstract]
Long-term receivables	243
Non-recourse debt	2,299
Recourse debt	$ 0

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- Definition

Non-recourse debt is secured by the capital stock, physical assets, contracts and cash flows of the related subsidiary. The risk is limited to the respective subsidiary business and is without recourse to the Parent Company and other subsidiaries.

+ References

No definition available.

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- Definition

Recourse debt is direct borrowings by the Parent Company that is structurally subordinate to the affiliates non-recourse debt.

+ References

No definition available.

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- Definition

Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

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