Other Non-Operating Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Component of Other Expense, Nonoperating [Line Items]
Other non-operating expense	$ 82	$ 2	$ 82	$ 7
Yangcheng [Member]
Component of Other Expense, Nonoperating [Line Items]
Effective Ownership %	25.00%		25.00%
Generation Capacity (MW)	2,100		2,100
Fair Value	26		26
Carrying Amount	$ 100		$ 100

This element represents the aggregate carrying amount of the assets measured at fair value on a nonrecurring basis by the entity before the recognition of impairment charges.

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Period Type:	instant

- Definition

Total generation capacity of the subsidiary, in megawatts.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

The effective percentage of the affiliate's voting interest owned by the reporting entity (directly or indirectly)

+ Details

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Period Type:	instant

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Period Type:	duration

- Definition

The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 9

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration