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Common Stock and Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) - Restricted Stock And Restricted Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested, fair value $ 44 $ 113 $ 60
Unrecognized compensation costs from restricted stock, net of estimated forfeitures $ 195    
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period (in years) 2 years 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested Awards, beginning balance (in shares) 2.8    
Vested (in shares) (0.6)    
Forfeited (in shares) (0.3)    
Granted (in shares) 2.5    
Nonvested Awards, ending balance (in shares) 4.4 2.8  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested Awards, Weighted Average Grant Date Fair Value, beginning balance (in dollars per share) $ 59.14    
Vested, Weighted Average Grant Date Fair Value (in dollars per share) 59.01    
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share) 66.24    
Granted, Weighted Average Grant Date Fair Value (in dollars per share) 80.95 $ 62.51 $ 57.59
Nonvested Awards, Weighted Average Grant Date Fair Value, ending balance (in dollars per share) $ 70.93 $ 59.14