Fair Value Measurements - Derivative Assets and Liabilities at Fair Value (Detail) - USD ($)	Aug. 31, 2018	May 31, 2018
Derivatives, Fair Value [Line Items]
Accrued Liabilities	$ 102,000,000	$ 184,000,000
Collateral received on derivative assets	31,000,000	23,000,000
Fair Value, Measurements, Recurring | Foreign exchange forwards and options
Derivatives, Fair Value [Line Items]
Reduction in derivative assets if netted	99,000,000	182,000,000
Reduction in derivative liabilities if netted	99,000,000	182,000,000
Fair Value Measurements Using Level 2 | Fair Value, Measurements, Recurring
Derivatives, Fair Value [Line Items]
Assets at Fair Value	485,000,000	400,000,000
Other Current Assets	350,000,000	240,000,000
Other Long-term Assets	135,000,000	160,000,000
Liabilities at Fair Value	111,000,000	190,000,000
Accrued Liabilities	102,000,000	184,000,000
Other Long-term Liabilities	9,000,000	6,000,000
Fair Value Measurements Using Level 2 | Fair Value, Measurements, Recurring | Foreign exchange forwards and options
Derivatives, Fair Value [Line Items]
Assets at Fair Value	476,000,000	389,000,000
Other Current Assets	347,000,000	237,000,000
Other Long-term Assets	129,000,000	152,000,000
Liabilities at Fair Value	99,000,000	182,000,000
Accrued Liabilities	99,000,000	182,000,000
Other Long-term Liabilities	0	0
Fair Value Measurements Using Level 2 | Fair Value, Measurements, Recurring | Embedded derivatives
Derivatives, Fair Value [Line Items]
Assets at Fair Value	9,000,000	11,000,000
Other Current Assets	3,000,000	3,000,000
Other Long-term Assets	6,000,000	8,000,000
Liabilities at Fair Value	12,000,000	8,000,000
Accrued Liabilities	3,000,000	2,000,000
Other Long-term Liabilities	9,000,000	6,000,000
Cash and Cash Equivalents | Foreign exchange forwards and options
Derivatives, Fair Value [Line Items]
Collateral posted on derivative liabilities	0	0
Collateral received on derivative assets	$ 31,000,000	$ 23,000,000