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Stock Plans (Tables)
6 Months Ended
Nov. 23, 2014
Stock Plans [Abstract]  
Schedule of compensation expense related to stock-based payments [Table Text Block]
  Quarter Ended  Six-Month Period Ended
In Millions Nov. 23, 2014 Nov. 24, 2013  Nov. 23, 2014 Nov. 24, 2013
Compensation expense related to stock-based payments$ 22.1$ 27.8 $ 67.7$ 69.1
Schedule of net cash proceeds from the exercise of stock options less shares used for withholding taxes and the intrinsic value of options exercised [Table Text Block]
  Six-Month Period Ended
In Millions Nov. 23, 2014  Nov. 24, 2013
Net cash proceeds$ 35.9 $ 27.5
Intrinsic value of options exercised$ 40.1 $ 71.0
Schedule of estimated fair value of stock options granted and the assumptions used for the Black-Scholes option-pricing model [Table Text Block]
       
  Six-Month Period Ended
  Nov. 23, 2014  Nov. 24, 2013 
Estimated fair values of stock options granted  $ 7.22  $ 6.03 
Assumptions:      
Risk-free interest rate  2.6%  2.6%
Expected term 8.5 years  9.0 years 
Expected volatility  17.5%  17.4%
Dividend yield  3.0%  3.1%
Schedule of information on stock option activity [Table Text Block]
 Options Outstanding (Thousands) Weighted-Average Exercise Price Per ShareWeighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (Millions)
Balance as of May 25, 2014 44,169.0$32.10   
Granted 2,253.1 53.70   
Exercised (1,850.4) 26.16   
Forfeited or expired (21.6) 43.79   
Outstanding as of Nov. 23, 2014 44,550.1$33.44 4.63$824.5
Exercisable as of Nov. 23, 2014 32,407.5$29.83 3.39$713.5
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 Cash-Settled Share-Based Units (Thousands) Weighted-Average Grant-Date Fair Value
Non-vested as of May 25, 2014 7,893.7$40.81 249.5$25.67 822.8$36.52
Granted 1,575.4 53.46 49.5 53.70  - 0.00
Vested (1,899.0) 35.07 (54.9) 37.63 (822.1) 37.40
Forfeited (116.3) 44.24 (3.8) 43.60 (0.7) 37.40
Non-vested as of Nov. 23, 2014 7,453.8$44.32 240.3$44.37 0.00$0.00