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Stock Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
May 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award Options Intrinsic Value Abstract  
Outstanding at May 31, 2011 $ 327 [1]
Stock options exercisable 181 [1]
Stock options expected to vest $ 135 [1]
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward  
Outstanding at June 1, 2010 20,238,056
Stock options granted 2,474,603
Stock options exercised (2,043,050)
Stock options forfeited (506,446)
Outstanding at May 31, 2011 20,163,163
Stock options exercisable 12,968,690
Stock options expected to vest 6,618,915
Stock options available for future grants 11,928,567
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term (in years) Abstract  
Outstanding at May 31, 2011 5.7
Stock options exercisable 4.3
Stock options expected to vest 8.2
Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price Abstract  
Outstanding at June 1, 2010 $ 78.32
Stock options granted $ 81.86
Stock options exercised $ 53.13
Stock options forfeited $ 104.38
Outstanding at May 31, 2011 $ 81.20
Stock options exercisable $ 84.74
Stock options expected to vest $ 74.83
[1] Only presented for options with market value at May 31, 2011 in excess of the exercise price of the option.