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Acquisitions (Narrative) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Dec. 31, 2010
Acquisitions [Abstract]   
Adjustments to provisional values$ 0$ 0 
NOCC non-current restricted cash$ 25$ 25$ 25