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Stock-Based Compensation - Schedule of Stock Option Activity (Details)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2019
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward  
Stock Options, Outstanding at June 1, 2018 12,984,917
Stock Options, Granted 2,383,158
Stock Options, Exercised (1,112,160)
Stock Options, Forfeited (633,400)
Stock Options, Outstanding at May 31, 2019 13,622,515
Stock Options, Exercisable 8,344,344
Stock Options, Expected to vest 4,950,924
Stock Options, Available for future grants 13,894,509
Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price [Abstract]  
Weighted-Average Exercise Price, Outstanding at June 1, 2018 | $ / shares $ 147.98
Weighted-Average Exercise Price, Granted | $ / shares 244.16
Weighted-Average Exercise Price, Exercised | $ / shares 91.01
Weighted-Average Exercise Price, Forfeited | $ / shares 212.85
Weighted-Average Exercise Price, Outstanding at May 31, 2019 | $ / shares 166.89
Weighted-Average Exercise Price, Exercisable | $ / shares 134.70
Weighted-Average Exercise Price, Expected to vest | $ / shares $ 217.78
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term (in years) [Abstract]  
Weighted-Average Remaining Contractual Term, Outstanding at May 31, 2019 6 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable 4 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Expected to vest 8 years 3 months 18 days
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures Abstract  
Aggregate Intrinsic Value, Outstanding at May 31, 2018 | $ $ 260 [1]
Aggregate Intrinsic Value, Exercisable | $ $ 260 [1]
[1] Only presented for options with market value at May 31, 2019 in excess of the exercise price of the option.