Stock Plans (Tables)

9 Months Ended

Feb. 28, 2016

Stock Plans [Abstract]

Schedule of compensation expense related to stock-based payments [Table Text Block]

		Quarter Ended				Nine-MonthPeriod Ended
In Millions		Feb. 28, 2016		Feb. 22, 2015		Feb. 28, 2016		Feb. 22, 2015
Compensation expense related to stock-based payments	$	19.1	$	25.4	$	73.4	$	93.1

Schedule of net cash proceeds received from the exercise of stock options [Table Text Block]

		Nine-MonthPeriod Ended
In Millions		Feb. 28, 2016		Feb. 22, 2015
Net cash proceeds	$	103.0	$	103.1
Intrinsic value of options exercised	$	141.7	$	121.6

Schedule of estimated fair value of stock options granted and the assumptions used for the Black-Scholes option-pricing model [Table Text Block]

	Nine-Month Period Ended
	Feb. 28, 2016		Feb. 22, 2015
Estimated fair values of stock options granted	$7.24		$7.22
Assumptions:
Risk-free interest rate	2.4	%	2.6	%
Expected term	8.5 years		8.5 years
Expected volatility	17.6	%	17.5	%
Dividend yield	3.2	%	3.0	%

Schedule of information on stock option activity [Table Text Block]

	Options Outstanding (Thousands)		Weighted-Average Exercise Price Per Share	Weighted-Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (Millions)
Balance as of May 31, 2015	39,077.2	$	34.35
Granted	1,930.2		55.72
Exercised	(4,747.6)		28.34
Forfeited or expired	(125.8)		48.03
Outstanding as of Feb. 28, 2016	36,134.0	$	36.23	4.27	$	822.8
Exercisable as of Feb. 28, 2016	26,102.8	$	31.85	3.01	$	708.7

Schedule of information on restricted stock and performance award unit activity [Table Text Block]

	Equity Classified			Liability Classified
	Share-Settled Units (Thousands)		Weighted-Average Grant-Date Fair Value	Share-Settled Units (Thousands)		Weighted-Average Grant-Date Fair Value
Non-vested as of May 31, 2015	6,235.6	$	46.44	237.0	$	44.84
Granted	1,267.8		55.91	63.8		55.82
Vested	(2,028.6)		47.08	(69.5)		40.55
Forfeited	(219.2)		48.77	(17.1)		51.56
Non-vested as of Feb. 28, 2016	5,255.6	$	48.39	214.2	$	48.40