Stock Based Compensation (Tables)

12 Months Ended

May. 31, 2015

Stock Based Compensation (Tables) [Abstract]

Stock-based compensation expense

	2015		2014		2013
Stock-based compensation expense	$	133	$	117	$	109

Schedule of Stock Based Compensation Key Assumptions for Valuation

		2015			2014			2013
Weighted-average Black-Scholes value		$	53.33		$	35.79		$	29.20
Intrinsic value of options exercised		$	253		$	347		$	107
Black-Scholes Assumptions:
	Expected lives		6.3 years			6.2 years			6.1 years
	Expected volatility		34	%		35	%		35	%
	Risk-free interest rate		2.02	%		1.47	%		0.94	%
	Dividend yield		0.448	%		0.561	%		0.609	%

Schedule of Stock Option Activity

		Stock Options
		Shares		Weighted-Average Exercise Price	Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value (in millions)(1)
Outstanding at June 1, 2014		15,634,856	$	91.71
	Granted	2,445,146		150.32
	Exercised	(3,516,512)		91.18
	Forfeited	(341,666)		107.62
Outstanding at May 31, 2015		14,221,824	$	101.54	6.1	$	1,031
Exercisable		7,994,368	$	89.19	4.5	$	678
Expected to vest		5,853,809	$	117.39	8.2	$	331
Available for future grants		13,157,142
(1)	Only presented for options with market value at May 31, 2015 in excess of the exercise price of the option.

Schedule of Vested and Unvested Restricted Stock

		Restricted Stock
		Shares	Weighted-Average Grant Date Fair Value
Unvested at June 1, 2014		480,157	$	91.46
	Granted	154,115		148.89
	Vested	(192,920)		88.33
	Forfeited	(2,310)		116.12
Unvested at May 31, 2015		439,042	$	112.87

Schedule of Stock Option Vesting

	Stock Options
	Vested during the year	Fair value (in millions)
2015	2,611,524	$	83
2014	2,408,179		65
2013	2,824,757		81