Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Aug. 31, 2016	May 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 779	$ 774
Assets at Fair Value	4,797	5,467
Cash and Equivalents	2,659	3,138
Short-term Investments	2,128	2,319
Other Long-term Assets	10	10
Fair Value Measurements Using Level 1 | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	1,045	1,265
Cash and Equivalents	200	100
Short-term Investments	845	1,165
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	2,963	3,418
Cash and Equivalents	1,680	2,264
Short-term Investments	1,283	1,154
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Time deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	767	831
Cash and Equivalents	756	827
Short-term Investments	11	4
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | U.S. Agency securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	707	679
Cash and Equivalents	0	0
Short-term Investments	707	679
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Commercial paper and bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	671	733
Cash and Equivalents	106	262
Short-term Investments	565	471
Other Long-term Assets	0	0
Fair Value Measurements Using Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	818	1,175
Cash and Equivalents	818	1,175
Short-term Investments	0	0
Other Long-term Assets	0	0
Fair Value Measurements Using Level 3 | Non-marketable preferred stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value	10	10
Cash and Equivalents	0	0
Short-term Investments	0	0
Other Long-term Assets	$ 10	$ 10