Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Stock-Based Compensation

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

	Three Months Ended				Six Months Ended
	June 30,				June 30,
In millions	2018		2017		2018		2017
Stock-based compensation:
Stock options	$	11	$	14	$	25	$	34
Restricted stock units and performance share units		43		39		85		74
Total stock-based compensation	$	54	$	53	$	110	$	108