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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 36 $ 23
Income taxes 543 276
Income tax refunds received (191) (6)
Cash tax payments, net $ 352 $ 270