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Stock Plans (Tables)
3 Months Ended
Aug. 25, 2013
Stock Plans [Abstract]  
Schedule of compensation expense related to stock-based payments [Table Text Block]
  Quarter Ended
In Millions Aug. 25, 2013 Aug. 26, 2012
Compensation expense related to stock-based payments$ 41.3$ 43.2
Schedule of net cash proceeds from the exercise of stock options less shares used for withholding taxes and the intrisic value of options exercised [Table Text Block]
  Quarter Ended
In Millions Aug. 25, 2013  Aug. 26, 2012
Net cash proceeds$ 11.7 $ 39.0
Intrinsic value of options exercised$ 50.3 $ 58.2
Schedule of estimated fair value of stock options granted and the assumptions used for the Black-Scholes option-pricing model [Table Text Block]
      
  Quarter Ended
  Aug. 25, 2013  Aug. 26, 2012
Estimated fair values of stock options granted  $ 6.03  $ 3.65
Assumptions:     
Risk-free interest rate  2.6%   1.6%
Expected term  9.0years   9.0years
Expected volatility  17.4%   17.3%
Dividend yield  3.1%   3.5%
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 26, 2013 47,672.1$30.22   
Granted 2,789.8 48.33   
Exercised (1,840.1) 24.12   
Forfeited or expired (38.6) 37.68   
Outstanding as of Aug. 25, 2013 48,583.2$31.49 5.20$890.8
Exercisable as of Aug. 25, 2013 33,776.6$27.94 3.89$739.1
Schedule of information on restricted stock 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 26, 2013 8,042.2$35.89 388.2$32.60 2,287.8$38.41
Granted 1,901.3 48.37 75.9 48.39  - 0.00
Vested (1,677.1) 28.55 (127.0) 28.39 (1,421.1) 28.00
Forfeited (57.5) 39.53 0.0 0.00 (4.8) 35.89
Non-vested as of Aug. 25, 2013 8,208.9$40.06 337.1$36.54 861.9$48.37