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Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Debt Instrument [Line Items]    
Maturity of long-term debt next fiscal year $ 6  
Maturity of long-term debt in year two 6  
Maturity of long-term debt in year three 3  
Maturity of long-term debt in year four 0  
Maturity of long-term debt in year five 500  
Fair Value, Inputs, Level 2    
Debt Instrument [Line Items]    
Fair value of long term debt $ 3,294 $ 3,401