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Summary Of Significant Accounting Policies (Schedule Of Additional Investment Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]      
Oil, gas and NGL sales $ 15,140 $ 19,827 $ 13,750
Accounts receivable 1,573 1,767  
Catalyst [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Oil, gas and NGL sales 213 405 264
Production expenses 93 55 42
Accounts receivable $ 11 $ 14 $ 22