Risk Management and Derivatives - Additional Information (Detail)	9 Months Ended
	Feb. 28, 2022 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit risk related contingent features collateral threshold	$ 50,000,000
Derivative instruments in net asset position	375,000,000
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	305,000,000
Cash and Cash Equivalents
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, fair value of collateral	62,000,000
Not designated as derivative instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	3,200,000,000
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	$ 589,000,000
Derivatives designated as cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Additional period for forecasted transaction expected to occur	2 months
Total notional amount of outstanding derivatives	$ 17,200,000,000