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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 3,894 $ 3,530 $ 7,635 $ 7,289
Oil, Gas and NGL Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 2,796 2,493 5,425 5,172
Oil, Gas and NGL Sales [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 2,413 2,106 4,602 4,249
Oil, Gas and NGL Sales [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 57 122 185 335
Oil, Gas and NGL Sales [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 326 265 638 588
Marketing and Midstream Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 1,098 1,037 2,210 2,117
Marketing and Midstream Revenues [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 801 735 1,608 1,465
Marketing and Midstream Revenues [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 100 123 221 275
Marketing and Midstream Revenues [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 197 $ 179 $ 381 $ 377