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Income Taxes - Schedule of Reconciliation of Total Income Tax Expense and Amount Computed by Statutory Federal Income Tax Rate to Income Before Taxes (Parenthetical) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2018
May 31, 2018
May 31, 2017
May 31, 2016
Income Taxes [Line Items]          
Foreign deferred tax benefits     $ (579) $ (108) $ (2)
U.S. deferred tax expenses     271 989 $ 155
Provisional benefit related to remeasurement of net U.S. deferred tax liability $ (1,150) $ (1,150) (1,150)    
Benefits from share-based payments     60 55  
U.S. Plans [Member]          
Income Taxes [Line Items]          
Additional provisional amount recognized one time benefit $ 204 $ 204      
Corporate Structuring Transactions [Member]          
Income Taxes [Line Items]          
Foreign deferred tax benefits     434 94  
U.S. deferred tax expenses     $ 179 $ 26