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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Derivatives Fair Value [Line Items]    
Gross Fair Value $ 117 $ 128
Amounts Netted
Net Fair Value 117 128
Short-term Derivative Asset [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value 47 138
Amounts Netted (13) (19)
Net Fair Value $ 34 119
Balance Sheet Classification Other current assets  
Long-term Derivative Asset [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ 10 12
Amounts Netted (6)
Net Fair Value $ 4 12
Balance Sheet Classification Other long-term assets  
Short-term Derivative Liability [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ (152) (22)
Amounts Netted 13 19
Net Fair Value $ (139) (3)
Balance Sheet Classification Other current liabilities  
Long-term Derivative Liability [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ (22)
Amounts Netted 6
Net Fair Value $ (16)
Balance Sheet Classification Other long-term liabilities