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Loss Per Share (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Convertible Senior Notes
     
Loss per share      
Securities not included in computation of diluted loss per share (in millions of shares) 35 39 52
Stock options, restricted stock units and warrants
     
Loss per share      
Securities not included in computation of diluted loss per share (in millions of shares) 7 4 3