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Stock-Based Compensation - Schedule of Stock Option Activity (Details)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2020
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward  
Stock Options, Outstanding at June 1, 2019 13,622,515
Stock Options, Granted 3,839,144
Stock Options, Exercised (763,104)
Stock Options, Forfeited (573,810)
Stock Options, Outstanding at May 31, 2020 16,124,745
Stock Options, Exercisable 9,654,040
Stock Options, Expected to vest 5,975,696
Stock Options, Available for future grants 27,415,296
Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Exercise Price [Abstract]  
Weighted-Average Exercise Price, Outstanding at June 1, 2019 | $ / shares $ 166.89
Weighted-Average Exercise Price, Granted | $ / shares 159.77
Weighted-Average Exercise Price, Exercised | $ / shares 83.70
Weighted-Average Exercise Price, Forfeited | $ / shares 192.34
Weighted-Average Exercise Price, Outstanding at May 31, 2020 | $ / shares 167.79
Weighted-Average Exercise Price, Exercisable | $ / shares 154.19
Weighted-Average Exercise Price, Expected to vest | $ / shares $ 188.09
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, 2020 6 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable 4 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Expected to vest 8 years 4 months 24 days
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures Abstract  
Aggregate Intrinsic Value, Outstanding at May 31, 2020 | $ $ 118 [1]
Aggregate Intrinsic Value, Exercisable | $ $ 118 [1]
[1] Only presented for options with market value at May 31, 2020 in excess of the exercise price of the option.