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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2018
Text Block [Abstract]  
Income tax rate reconciliation from statutory to effective tax rate
Three Months Ended September 30,Nine Months Ended September 30,
In millions2018201720182017
Income (loss) before income taxes$(45)$(273)$(287)$(603)
Provision (benefit) for income taxes$-$(6)$2$965
Effective tax rate-%2.2%-0.7%-160.0%