Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 30, 2016	May 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 681	$ 774
Assets at Fair Value	5,953	5,467
Cash and Equivalents	4,339	3,138
Short-term Investments	1,604	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	1,256	1,265
Cash and Equivalents	350	100
Short-term Investments	906	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	4,006	3,418
Cash and Equivalents	3,308	2,264
Short-term Investments	698	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	820	831
Cash and Equivalents	781	827
Short-term Investments	39	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	628	679
Cash and Equivalents	335	0
Short-term Investments	293	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	647	733
Cash and Equivalents	281	262
Short-term Investments	366	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	1,911	1,175
Cash and Equivalents	1,911	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