Stock Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense for the following periods were:

In millions	Three months ended September 30				Nine months ended September 30
	2020		2019		2020		2019
Restricted stock units	$	23	$	25	$	55	$	67
Stock options	6		2		16		6
Employee stock purchase plan	2		1		5		3
Stock-based compensation expense	31		28		76		76
Tax benefit	(4)		(5)		(9)		(12)
Stock-based compensation expense (net of tax)	$	27	$	23	$	67	$	64

Schedule Of Share-Based Payment Award, Restricted Stock Units with Market-Condition, Valuation Assumptions

The table below details the assumptions used in determining the fair value of the market-based restricted stock units.

	For the nine months ended September 30, 2020
Dividend yield	—	%
Risk-free interest rate	0.16	%
Expected volatility	53.64	%

Schedule of Valuation Assumptions Used To Estimate Fair Value of Stock Options

The table below details the assumptions used in determining the fair value of the option grants.

	Nine months ended September 30
	2020		2019
Dividend yield	—	%	—	%
Risk-free interest rate	1.34	%	2.50	%
Expected volatility	34.63	%	34.79	%
Expected holding period (years)	3.7		3.9