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General (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Aug. 31, 2011
Business Acquisition Cost of Acquired Entity [Abstract]          
Acquisition Price         $ 128
General Details [Abstract]          
Dividends Payable Amount Per Share $ 0.13   $ 0.13    
Stock Based Compensation Details [Abstract]          
Stock-based compensation 23 22 60 56  
Treasury Shares [Abstract]          
Number Of Shares Repurchased 2.8   2.8    
Treasury Stock Acquired, Average Cost Per Share     $ 70    
Payments for Repurchase of Common Stock     $ 197    
Stock Repurchase Authorization, Remaining Number of Shares 2.9   2.9