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Plant, Property and Equipment, Net (Details Textual) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Plant, Property and Equipment, Net [Abstract]    
Recognized depreciation expense$ 59$ 48$ 174$ 135