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Short-Term Borrowings and Credit Lines - Additional Information (Detail) - USD ($)
Mar. 11, 2022
Mar. 15, 2021
Aug. 16, 2019
May 31, 2022
May 31, 2021
Short-term Debt [Line Items]          
Notes payable       $ 10,000,000 $ 2,000,000
Committed Credit Facility, Maturing March 10, 2023 | Revolving Credit Facility          
Short-term Debt [Line Items]          
Notes payable       0 0
Line of Credit | Committed Credit Facility, Maturing March 10, 2023 | Revolving Credit Facility          
Short-term Debt [Line Items]          
Debt instrument, term 364 days 364 days      
Borrowing capacity $ 1,000,000,000 $ 1,000,000,000      
Extension term 364 days        
Revolving credit facility, fee 0.02%        
Line of Credit | Committed Credit Facility, Maturing March 10, 2023 | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Short-term Debt [Line Items]          
Basis spread on variable rate, above LIBOR 0.60%        
Line of Credit | Committed Credit Facility, Maturing March 10, 2023 | Revolving Credit Facility, Option To Increase Upon Lender Approval          
Short-term Debt [Line Items]          
Borrowing capacity $ 1,500,000,000        
Line of Credit | Committed Credit Facility, Maturing March 11, 2027 | Revolving Credit Facility          
Short-term Debt [Line Items]          
Debt instrument, term 5 years   5 years    
Borrowing capacity $ 2,000,000,000   $ 2,000,000,000    
Extension term 2 years        
Revolving credit facility, fee 0.04%        
Line of credit facility, amount outstanding       $ 0 $ 0
Line of Credit | Committed Credit Facility, Maturing March 11, 2027 | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Short-term Debt [Line Items]          
Basis spread on variable rate, above LIBOR 0.60%        
Line of Credit | Committed Credit Facility, Maturing March 11, 2027 | Revolving Credit Facility, Option To Increase Upon Lender Approval          
Short-term Debt [Line Items]          
Borrowing capacity $ 3,000,000,000