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Supplemental Cash Flow Information (Details) (USD $)
In Millions
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 43 $ 54
Income taxes 65 73
Income tax refunds received   (1)
Cash tax payments, net $ 65 $ 72