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Goodwill and Other Intangible Assets (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Goodwill and Other Intangible Assets [Abstract]      
Intangible assets amortization expense $ 23us-gaap_AmortizationOfIntangibleAssets $ 27us-gaap_AmortizationOfIntangibleAssets $ 18us-gaap_AmortizationOfIntangibleAssets
Finite Lived Intangible Assets [Line Items]      
Net Book Value $ 57us-gaap_FiniteLivedIntangibleAssetsNet $ 72us-gaap_FiniteLivedIntangibleAssetsNet