Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 30, 2018	May 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash	$ 481	$ 415
Assets at Fair Value	4,052	5,256
Cash and Equivalents	3,423	4,249
Short-term Investments	618	996
Other Long-term Assets	11	11
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	359	1,178
Cash and Equivalents	0	500
Short-term Investments	359	678
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	3,201	3,652
Cash and Equivalents	2,942	3,334
Short-term Investments	259	318
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	1,421	925
Cash and Equivalents	1,318	907
Short-term Investments	103	18
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	52	102
Cash and Equivalents	50	100
Short-term Investments	2	2
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	205	451
Cash and Equivalents	51	153
Short-term Investments	154	298
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	1,523	2,174
Cash and Equivalents	1,523	2,174
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	11	11
Cash and Equivalents	0	0
Short-term Investments	0	0
Other Long-term Assets	$ 11	$ 11