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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2016
Text Block [Abstract]  
Income (loss) from operations before provision (benefit) for income taxes
Three Months Ended March 31,
In millions20162015
Income (loss) before income taxes$(101)$113
Provision (benefit) for income taxes$(23)$44
Effective tax rate22.8%38.9%