Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Feb. 28, 2022	May 31, 2021
Assets, Fair Value Disclosure [Abstract]
Cash	$ 730	$ 840
ASSETS AT FAIR VALUE	13,467	13,476
CASH AND EQUIVALENTS	8,704	9,889
SHORT-TERM INVESTMENTS	4,763	3,587
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	4,231	2,892
CASH AND EQUIVALENTS	117	0
SHORT-TERM INVESTMENTS	4,114	2,892
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	8,506	9,744
CASH AND EQUIVALENTS	7,857	9,049
SHORT-TERM INVESTMENTS	649	695
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	686	748
CASH AND EQUIVALENTS	42	57
SHORT-TERM INVESTMENTS	644	691
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	6,662	7,701
CASH AND EQUIVALENTS	6,662	7,701
SHORT-TERM INVESTMENTS	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	1,158	1,293
CASH AND EQUIVALENTS	1,153	1,291
SHORT-TERM INVESTMENTS	$ 5	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