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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Foreign currency translation gain (loss) [Member]
Aug. 31, 2012
Foreign currency translation gain (loss) [Member]
Aug. 31, 2013
Retirement plans adjustments [Member]
Aug. 31, 2012
Retirement plans adjustments [Member]
May 31, 2012
Retirement plans adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]              
Beginning balance $ (36)   $ 90 $ 54 $ (126) [1] $ (124) $ (124) [1]
Translation adjustment (78) 40 (78) [1] 40      
Reclassification from AOCI         1    
Ending balance $ (113) $ (30) $ 12 $ 94 $ (125) $ (124) $ (124) [1]
[1] Amounts in parentheses indicate debits to AOCI.