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Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2020

The following table sets forth the assumptions used to determine compensation cost for the market condition component of the PSP plan:


			Twelve Months Ended December 31, 2020
Expected volatility			22.81% - 24.60%
Risk-free interest rate			1.61% - 2.44%

The following summarizes PSP activity for the three years ended December 31, 2020:


	Share/Units	Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	5,799,884	$36.17
Granted	1,751,235	62.97
Shares issued	(1,588,642)	53.67
Forfeited	(196,000)	56.57
Outstanding at December 31, 2018	5,766,477	38.79
Granted	2,353,613	43.49
Shares issued	(2,367,135)	36.79
Forfeited	(238,227)	50.64
Outstanding at December 31, 2019	5,514,728	41.14
Granted	2,171,385	49.15
Shares issued	(1,221,950)	51.70
Forfeited	(844,138)	51.70
Outstanding at December 31, 2020	5,620,025	$40.36

The following summarizes the activity of the RSA program for the three years ended December 31, 2020:


	Shares	Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	166,300	$48.63
Granted	66,100	51.43
Shares issued	(100,289)	48.44
Forfeited	—	—
Outstanding at December 31, 2018	132,111	50.17
Granted	87,910	43.70
Shares issued	(52,021)	48.90
Forfeited	(7,300)	45.10
Outstanding at December 31, 2019	160,700	47.27
Granted	82,228	40.12
Shares issued	(83,053)	44.25
Forfeited	(33,800)	46.43
Outstanding at December 31, 2020	126,075	$44.83

Stock-based compensation expense and related income tax benefits were as follows:


In millions	2020		2019		2018
Total stock-based compensation expense (included in selling and administrative expense)	$	72	$	130	$	135
Income tax benefits related to stock-based compensation	17		30		16