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Stock Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
May 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract]  
Outstanding at May 31, 2013 $ 229 [1]
Stock options exercisable 137 [1]
Stock options expected to vest $ 87 [1]
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward  
Outstanding at June 1, 2012 21,031,538
Stock options granted 2,547,290
Stock options exercised (3,979,359)
Stock options forfeited (464,035)
Outstanding at May 31, 2013 19,135,434
Stock options exercisable 12,447,517
Stock options expected to vest 6,288,642
Stock options available for future grants 6,482,410
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term (in years) [Abstract]  
Outstanding at May 31, 2013 5.5
Stock options exercisable 4.2
Stock options expected to vest 8.1
Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price [Abstract]  
Outstanding at June 1, 2012 $ 84.39
Stock options granted $ 88.08
Stock options exercised $ 70.41
Stock options forfeited $ 91.44
Outstanding at May 31, 2013 $ 87.62
Stock options exercisable $ 90.23
Stock options expected to vest $ 82.77
[1] Only presented for options with market value at May 31, 2013 in excess of the exercise price of the option.