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Commitments And Contingencies (Detail) (Bloom Lake [Member], USD $)	9 Months Ended
	Sep. 30, 2012
Bloom Lake [Member]
Related Party Transaction [Line Items]
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

- Definition

The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy.

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