Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 30, 2020	May 31, 2020
Assets, Fair Value Disclosure [Abstract]
Cash	$ 886	$ 596
ASSETS AT FAIR VALUE	11,812	8,787
CASH AND EQUIVALENTS	8,635	8,348
SHORT-TERM INVESTMENTS	3,177	439
Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	3,136	1,204
CASH AND EQUIVALENTS	0	800
SHORT-TERM INVESTMENTS	3,136	404
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	7,790	6,987
CASH AND EQUIVALENTS	7,749	6,952
SHORT-TERM INVESTMENTS	41	35
Fair Value, Inputs, Level 2 | Commercial paper and bonds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	39	32
CASH AND EQUIVALENTS	0	0
SHORT-TERM INVESTMENTS	39	32
Fair Value, Inputs, Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	6,767	5,973
CASH AND EQUIVALENTS	6,767	5,973
SHORT-TERM INVESTMENTS	0	0
Fair Value, Inputs, Level 2 | Time deposits
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	983	981
CASH AND EQUIVALENTS	982	979
SHORT-TERM INVESTMENTS	1	2
Fair Value, Inputs, Level 2 | U.S. Agency securities
Assets, Fair Value Disclosure [Abstract]
ASSETS AT FAIR VALUE	1	1
CASH AND EQUIVALENTS	0	0
SHORT-TERM INVESTMENTS	$ 1	$ 1