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Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Detail)

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Commitments And Contingencies (Detail) (Bloom Lake [Member], USD $)
9 Months Ended
Sep. 30, 2012
Bloom Lake [Member]
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Related Party Transaction [Line Items] Ìý
Capital investment required $ 1,300,000,000
Capital investment committed 1,000,000,000
Capital expenditures related to commitment 516,000,000
Capital investment, future payments $ 535,000,000