Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Aug. 31, 2021	May 31, 2021
Assets, Fair Value Disclosure [Abstract]
Cash	$ 759	$ 840
ASSETS AT FAIR VALUE	13,695	13,476
CASH AND EQUIVALENTS	10,720	9,889
SHORT-TERM INVESTMENTS	2,975	3,587
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	2,888	2,892
CASH AND EQUIVALENTS	601	0
SHORT-TERM INVESTMENTS	2,287	2,892
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	10,048	9,744
CASH AND EQUIVALENTS	9,360	9,049
SHORT-TERM INVESTMENTS	688	695
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	759	748
CASH AND EQUIVALENTS	74	57
SHORT-TERM INVESTMENTS	685	691
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	8,122	7,701
CASH AND EQUIVALENTS	8,122	7,701
SHORT-TERM INVESTMENTS	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	1,167	1,293
CASH AND EQUIVALENTS	1,164	1,291
SHORT-TERM INVESTMENTS	$ 3	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