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