Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	May 31, 2021	May 31, 2020
Assets, Fair Value Disclosure [Abstract]
Cash	$ 840	$ 596
ASSETS AT FAIR VALUE	13,476	8,787
CASH AND EQUIVALENTS	9,889	8,348
SHORT-TERM INVESTMENTS	3,587	439
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	2,892	1,204
CASH AND EQUIVALENTS	0	800
SHORT-TERM INVESTMENTS	2,892	404
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	9,744	6,987
CASH AND EQUIVALENTS	9,049	6,952
SHORT-TERM INVESTMENTS	695	35
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	748	32
CASH AND EQUIVALENTS	57	0
SHORT-TERM INVESTMENTS	691	32
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	7,701	5,973
CASH AND EQUIVALENTS	7,701	5,973
SHORT-TERM INVESTMENTS	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	1,293	981
CASH AND EQUIVALENTS	1,291	979
SHORT-TERM INVESTMENTS	2	2
Fair Value, Inputs, Level 2 | U.S. Agency securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	2	1
CASH AND EQUIVALENTS	0	0
SHORT-TERM INVESTMENTS	$ 2	$ 1