Subsequent Events (Details) (Mong Duong [Member], USD $) In Billions, unless otherwise specified	0 Months Ended
Jul. 08, 2011	Jul. 07, 2011 mw
Subsequent Event [Line Items]
Subsidiary Or Equity Method Investee Additional Percentage Ownership Purchased		10.00%
Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions	51.00%
Generation Capacity Mega Watts		1,200
Debt Instrument Unused Borrowing Capacity Amount	$ 1.5
Posco [Member]
Subsequent Event [Line Items]
Subsidiary Or Equity Method Investee Percentage Ownership Sold	30.00%
CIC [Member]
Subsequent Event [Line Items]
Subsidiary Or Equity Method Investee Percentage Ownership Sold	19.00%

Total generation capacity of the subsidiary, in megawatts.

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- Definition

Additional percentage of subsidiary's or equity method investee's stock purchased by the parent company.

+ Details

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- Definition

Percentage of subsidiary's or equity method investee's stock sold by the parent company.

+ Details

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Subparagraph b
-Article 5

+ Details

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- 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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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section H

+ Details

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