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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Gross Fair Value $ (569) $ (142)
Net Fair Value (569) (142)
Short-term Derivative Asset [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value 6 23
Amounts Netted (4) (18)
Net Fair Value $ 2 5
Balance Sheet Classification Other current assets  
Long-term Derivative Asset [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ 6 1
Net Fair Value $ 6 1
Balance Sheet Classification Other long-term assets  
Short-term Derivative Liability [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ (579) (161)
Amounts Netted 4 18
Net Fair Value $ (575) (143)
Balance Sheet Classification Other current liabilities  
Long-term Derivative Liability [Member]    
Derivatives Fair Value [Line Items]    
Gross Fair Value $ (2) (5)
Net Fair Value $ (2) $ (5)
Balance Sheet Classification Other long-term liabilities