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Income Taxes - Income before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Income Tax Contingency [Line Items]      
Effective tax rate on continuing operations (percent) 18.40% 21.70%  
Total gross unrecognized tax benefits, excluding related interest and penalties $ 460   $ 438
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods 258    
Change in income tax penalties and interest accrued 13    
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) 177   $ 164
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations 43    
Tax Year 2011 | Domestic Tax Authority      
Income Tax Contingency [Line Items]      
Proposed increase in tax related to the foreign tax credit matter $ 31