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Short-Term Borrowings and Credit Lines (Detail) - USD ($)
Aug. 16, 2019
Nov. 30, 2019
May 31, 2019
Aug. 25, 2015
Short-term Debt [Line Items]        
Notes payable   $ 300,000,000 $ 9,000,000  
Commercial paper        
Short-term Debt [Line Items]        
Notes payable   300,000,000 0  
Borrowing capacity   $ 2,000,000,000    
Notes payable - interest rate   1.63%    
Revolving Credit Facility        
Short-term Debt [Line Items]        
Borrowing capacity $ 2,000,000,000     $ 2,000,000,000
Option to increase borrowing 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%