Fair Value Measurements - Derivative Assets and Liabilities at Fair Value (Detail) - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
Derivatives, Fair Value [Line Items]
Accrued Liabilities	$ 162,000,000	$ 162,000,000
Collateral received from counterparties to hedging instruments	105,000,000	968,000,000
Fair value transfers between fair value hierarchy levels	0	0
Fair Value, Measurements, Recurring
Derivatives, Fair Value [Line Items]
Reduction in derivative liabilities if netted	136,000,000	161,000,000
Reduction In derivative asset if netted	136,000,000	161,000,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Derivatives, Fair Value [Line Items]
Assets at Fair Value	617,000,000	1,639,000,000
Other Current Assets	496,000,000	1,114,000,000
Other Long-term Assets	121,000,000	525,000,000
Liabilities at Fair Value	199,000,000	175,000,000
Accrued Liabilities	162,000,000	162,000,000
Other Long-term Liabilities	37,000,000	13,000,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Assets at Fair Value	603,000,000	1,554,000,000
Other Current Assets	487,000,000	1,034,000,000
Other Long-term Assets	116,000,000	520,000,000
Liabilities at Fair Value	145,000,000	164,000,000
Accrued Liabilities	115,000,000	160,000,000
Other Long-term Liabilities	30,000,000	4,000,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Embedded derivatives
Derivatives, Fair Value [Line Items]
Assets at Fair Value	7,000,000	7,000,000
Other Current Assets	2,000,000	2,000,000
Other Long-term Assets	5,000,000	5,000,000
Liabilities at Fair Value	9,000,000	11,000,000
Accrued Liabilities	2,000,000	2,000,000
Other Long-term Liabilities	7,000,000	9,000,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps
Derivatives, Fair Value [Line Items]
Assets at Fair Value	7,000,000	78,000,000
Other Current Assets	7,000,000	78,000,000
Other Long-term Assets	0	0
Liabilities at Fair Value	45,000,000	0
Accrued Liabilities	45,000,000	0
Other Long-term Liabilities	0	0
Cash and Cash Equivalents
Derivatives, Fair Value [Line Items]
Collateral received from counterparties to hedging instruments	105,000,000
Cash and Cash Equivalents | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Collateral received from counterparties to hedging instruments	105,000,000	900,000,000
Derivative liability, fair value of collateral	0	0
Cash and Cash Equivalents | Interest rate swaps
Derivatives, Fair Value [Line Items]
Collateral received from counterparties to hedging instruments	$ 0	68,000,000
Securities Pledged as Collateral | Interest rate swaps
Derivatives, Fair Value [Line Items]
Collateral received from counterparties to hedging instruments		$ 74,000,000