Risk Management and Derivatives - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	May 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred net gains (net of tax) on both outstanding and matured derivatives accumulated in other comprehensive income are expected to be reclassified to net income during the next twelve months as a result of underlying hedged transactions also being recorded in net income	$ 557
Maximum term over which the Company is hedging exposures to the variability of cash flows for its forecasted and recorded transactions (in months)	21 months
Collateral received from counterparties to hedging instruments	$ 263	$ 289
Not designated as derivative instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	4,200
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	$ 370
Derivatives designated as cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Additional period for forecasted transaction expected to occur	2 years
Total notional amount of outstanding derivatives	$ 8,900
Cash and Cash Equivalents
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral received from counterparties to hedging instruments	263
Cash and Cash Equivalents | Foreign exchange forwards and options
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collateral received from counterparties to hedging instruments	$ 263	$ 289