Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 30, 2021	May 31, 2021
Assets, Fair Value Disclosure [Abstract]
Cash	$ 840	$ 840
ASSETS AT FAIR VALUE	15,103	13,476
CASH AND EQUIVALENTS	10,751	9,889
SHORT-TERM INVESTMENTS	4,352	3,587
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	3,878	2,892
CASH AND EQUIVALENTS	224	0
SHORT-TERM INVESTMENTS	3,654	2,892
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	10,385	9,744
CASH AND EQUIVALENTS	9,687	9,049
SHORT-TERM INVESTMENTS	698	695
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	738	748
CASH AND EQUIVALENTS	44	57
SHORT-TERM INVESTMENTS	694	691
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	8,732	7,701
CASH AND EQUIVALENTS	8,732	7,701
SHORT-TERM INVESTMENTS	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	915	1,293
CASH AND EQUIVALENTS	911	1,291
SHORT-TERM INVESTMENTS	$ 4	2
Fair Value, Inputs, Level 2 | U.S. Agency securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE		2
CASH AND EQUIVALENTS		0
SHORT-TERM INVESTMENTS		$ 2