Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Text Block [Abstract]

Income (loss) from operations before provision (benefit) for income taxes

		Three Months Ended March 31,
In millions		2018		2017
Income (loss) before income taxes	$	(96)	$	(120)
Provision (benefit) for income taxes	$	2	$	(48)
Effective tax rate		-2.1%		40.0%