Common Stock and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	May 31, 2019 USD ($) $ / shares shares	May 31, 2018 USD ($) $ / shares shares	May 31, 2017 USD ($) $ / shares shares
Class A Convertible Common Stock
Common Stock and Share Based Compensation [Line Items]
Common stock, no par value | $ / shares	$ 0
Common stock, number of shares authorized (in shares) | shares	400,000,000
Common stock conversion	Each share of Class A Common Stock is convertible into one share of Class B Common Stock.
Common stock, Class A conversion ratio to Class B (in shares)	1
Class B Common Stock
Common Stock and Share Based Compensation [Line Items]
Common stock, no par value | $ / shares	$ 0
Common stock, number of shares authorized (in shares) | shares	2,400,000,000
Stock Incentive Plan
Common Stock and Share Based Compensation [Line Items]
Stock options vesting period (in years)	4 years
Stock options expiration from the date of grant (in years)	10 years
Stock Incentive Plan | Class B Common Stock
Common Stock and Share Based Compensation [Line Items]
Shares available for grant (in shares) | shares	718,000,000
Minimum term of market traded options for estimates of expected volatility (in years)	1 year
Weighted average remaining contractual life for options outstanding (in years)	5 years 10 months 24 days
Weighted average remaining contractual life for options exercisable (in years)	4 years 3 months 18 days
Aggregate intrinsic value for options outstanding | $	$ 2,507
Aggregate intrinsic value for options exercisable | $	2,138
Total intrinsic value of options exercised | $	938	$ 889	$ 594
Stock options | Stock Incentive Plan
Common Stock and Share Based Compensation [Line Items]
Unrecognized compensation costs from stock options, net of estimated forfeitures | $	$ 352
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 1 month 6 days
Stock options | Stock Incentive Plan | Class B Common Stock
Common Stock and Share Based Compensation [Line Items]
Weighted average fair value per share of the options granted (in dollars per share) | $ / shares	$ 22.78	$ 9.82	$ 9.38
Employee Stock | Class B Common Stock
Common Stock and Share Based Compensation [Line Items]
Employee stock purchase plans, payroll deductions	10.00%
Employee stock purchase plan offering period		6 months
Shares purchased, price as percentage of lower of the fair market value	85.00%
Purchase of shares by employee (in shares) | shares	2,500,000	3,100,000	3,100,000