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Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019
Expected volatility	22.81%-24.60%
Risk-free interest rate	1.47%-2.44%

The following summarizes PSP activity for the three years ended December 31, 2019:



	Share/Units		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	5,950,130			$35.89
Granted	2,163,912		51.78
Shares issued	(1,876,134	)	51.00
Forfeited	(438,024	)	45.96
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

The following summarizes the activity of the RSA program for the three years ended December 31, 2019:



	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	169,331			$45.34
Granted	63,319		57.24
Shares issued	(59,650	)	47.90
Forfeited	(6,700	)	53.53
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

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



In millions	2019		2018		2017
Total stock-based compensation expense (included in selling and administrative expense)	$	130	$	135	$	147
Income tax benefits related to stock-based compensation	30		16		45