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Short-Term Borrowings and Credit Lines (Detail) - USD ($)
Mar. 15, 2021
Apr. 02, 2021
Feb. 28, 2021
May 31, 2020
Apr. 06, 2020
Commercial paper          
Short-term Debt [Line Items]          
Line of credit facility, amount outstanding     $ 0 $ 248,000,000  
Weighted average interest rate       1.65%  
Borrowing capacity     $ 4,000,000,000    
Commercial paper | Subsequent Event          
Short-term Debt [Line Items]          
Line of credit facility, amount outstanding   $ 0      
Borrowing capacity $ 3,000,000,000        
Line of Credit          
Short-term Debt [Line Items]          
Borrowing capacity         $ 2,000,000,000
Line of Credit | Subsequent Event          
Short-term Debt [Line Items]          
Line of credit facility, amount outstanding   $ 0      
Borrowing capacity $ 1,000,000,000        
Extension term 364 days        
Extension term, period prior to termination 30 days        
Basis spread on variable rate, above LIBOR 0.50%        
Revolving credit facility, fee 0.03%        
Line of Credit | Subsequent Event | Option To Increase Upon Lender Approval          
Short-term Debt [Line Items]          
Borrowing capacity $ 1,500,000,000