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Summary Of Significant Accounting Policies (Schedule Of Additional Investment Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]      
Oil, gas and NGL sales $ 13,750 $ 4,673 $ 6,674
Production expenses 2,131 1,123 $ 1,197
Accounts receivable 1,543 $ 601  
Catalyst [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Oil, gas and NGL sales 264    
Production expenses 42    
Accounts receivable $ 22