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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2016
May 31, 2017
May 31, 2016
May 31, 2015
Income Taxes [Line Items]        
Earnings From Foreign Operations   $ 919 $ 905 $ 773
Statutory Federal Income Tax Rate   35.00% 35.00% 35.00%
Internal restructuring $ 76   $ 76  
Permanently Reinvested Earnings of Foreign Subsidiaries   $ 2,100 1,600  
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy 522 1,200 522  
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 45 63 45  
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest $ 11 $ 11 $ 11  
U.S. [Member]        
Income Taxes [Line Items]        
Percent Income Earned in Domestic Companies   90.00%    
Foreign Country [Member]        
Income Taxes [Line Items]        
Operating Loss Carryforwards   $ 3,600    
State And Local Jurisdiction [Member]        
Income Taxes [Line Items]        
Operating Loss Carryforwards   663    
Adoption of U.S. Foreign Currency Tax Regulations [Member]        
Income Taxes [Line Items]        
Impact on tax rate, amount   62    
Accounting Standards Update on Share-based Payments [Member]        
Income Taxes [Line Items]        
Impact on tax rate, amount   $ 55