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Short-Term Borrowings and Credit Lines - Additional Information (Detail) - USD ($)
Apr. 06, 2020
Aug. 16, 2019
May 31, 2020
May 31, 2019
Aug. 28, 2015
Short-term Debt [Line Items]          
Notes payable     $ 248,000,000 $ 9,000,000  
Revolving Credit Facility          
Short-term Debt [Line Items]          
Borrowing capacity   $ 2,000,000,000     $ 2,000,000,000
Maximum borrowing capacity, additional amount   $ 3,000,000,000      
Line of credit facility extension period after maturity   1 year      
Revolving credit facility, fee   0.04%      
Line of credit facility, amount outstanding     0 $ 0  
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility          
Short-term Debt [Line Items]          
Basis spread on variable rate, above LIBOR   0.46%      
Committed Credit Facility, Maturing April 5, 2021 | Line of Credit          
Short-term Debt [Line Items]          
Borrowing capacity $ 2,000,000,000        
Revolving credit facility, fee 0.20%        
Notes payable     $ 0    
Committed Credit Facility, Maturing April 5, 2021 | London Interbank Offered Rate (LIBOR) | Line of Credit          
Short-term Debt [Line Items]          
Basis spread on variable rate, above LIBOR 1.05%