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Business Combinations (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
Mexico acquisition [Member]
May 31, 2011
India acquisition [Member]
May 31, 2013
Poland acquisition [Member]
May 31, 2013
Brazil acquisition [Member]
May 31, 2013
France acquisition [Member]
Business Acquisition Cost Of Acquired Entity [Abstract]            
Current assets $ 145          
Property and equipment 91          
Goodwill 351          
Intangible assets 60          
Other non-current assets 70          
Current liabilities (174)          
Long-term liabilities (36)          
Acquisition price $ 507 $ 128 $ 96 $ 54 $ 398 $ 55
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years          
Acquired Finite-lived Intangible Assets Amortization Period, Majority of Expense Recognized 5 years