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Earnings Per Share (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Convertible Senior Notes
Loss per share
Securities not included in computation of diluted loss per share (in millions of shares)	17	18	35
Stock options, restricted stock units and warrants
Loss per share
Securities not included in computation of diluted loss per share (in millions of shares)		6	7

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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