Derivative Instruments and Hedging Activities - Derivative Notional Amounts and Weighted-Average Rate (Details) - USD ($)	Feb. 28, 2022	May 31, 2021
Pay-fixed swaps
Derivative [Line Items]
Notional Amount	$ 6,023,392,000	$ 6,579,516,000
Weighted- Average Rate Paid	2.61%	2.65%
Weighted- Average Rate Received	0.34%	0.20%
Receive-fixed swaps
Derivative [Line Items]
Notional Amount	$ 2,049,000,000	$ 2,399,000,000
Weighted- Average Rate Paid	1.00%	0.92%
Weighted- Average Rate Received	2.86%	2.80%
Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 8,072,392,000	$ 8,978,516,000
Weighted- Average Rate Paid	2.20%	2.19%
Weighted- Average Rate Received	0.98%	0.89%