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Stock-Based Compensation (Tables)

12 Months Ended

May 31, 2017

Stock Based Compensation Tables [Abstract]

Our total stock-based compensation expense for the years ended May 31 was as follows (in millions):

		2017				2016				2015
Stock-based compensation expense		$	154			$	144			$	133

Schedule of Stock Based Compensation Key Assumptions for Valuation

The following is a table of the weighted-average Black-Scholes value of our stock option grants, the intrinsic value of options exercised (in millions) and the key weighted-average assumptions used in the valuation calculations for options granted during the years ended May 31, and then a discussion of our methodology for developing each of the assumptions used in the valuation model:

	2017			2016			2015
Weighted-average Black-Scholes value	$	43.99		$	52.40		$	53.33
Intrinsic value of options exercised	$	274		$	115		$	253
Black-Scholes Assumptions:
Expected lives	6.5 years			6.4 years			6.3 years
Expected volatility		25	%		28	%		34	%
Risk-free interest rate		1.64	%		1.94	%		2.02	%
Dividend yield		0.719	%		0.519	%		0.448	%

Schedule of Stock Option Activity

The following table summarizes information about stock option activity for the year ended May 31, 2017:

	Stock Options
	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value (in millions)⁽¹⁾
Outstanding at June 1, 2016		14,441,431		$	111.99
Granted		2,783,968			169.73
Exercised		(3,330,197	)		100.65
Forfeited		(296,503	)		152.91
Outstanding at May 31, 2017		13,598,699		$	125.66		6.2	$	928
Exercisable		7,820,992		$	100.92		4.7	$	727
Expected to vest		5,473,800		$	159.15		8.2	$	191
Available for future grants		8,304,621

⁽¹⁾	Only presented for options with market value at May 31, 2017 in excess of the exercise price of the option.

Schedule of Vested and Unvested Restricted Stock

The following table summarizes information about vested and unvested restricted stock for the year ended May 31, 2017:

	Restricted Stock
	Shares			Weighted- Average Grant Date Fair Value
Unvested at June 1, 2016		389,152		$	136.57
Granted		153,984			166.12
Vested		(177,877	)		123.25
Forfeited		(2,955	)		159.46
Unvested at May 31, 2017		362,304		$	155.53

Schedule of Stock Option Vesting

The following table summarizes information about stock option vesting during the years ended May 31:

	Stock Options
	Vested during the year		Fair value (in millions)
2017		2,427,837	$	104
2016		2,572,129		98
2015		2,611,524		83