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Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Short-term Debt [Line Items]        
Total credit facility borrowing capacity $ 2,000 $ 2,000    
Available unused credit $ 2,000 1,777    
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Outstanding   $ (215)    
Weighted average interest rate   0.30%    
Letter of Credit [Member]        
Short-term Debt [Line Items]        
Outstanding   $ (8)    
Weighted average interest rate   1.20% 1.20% 1.20%