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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 3,120 $ 755 $ 5,698 $ 2,122
Oil, Gas and NGL Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 2,154 424 3,911 1,231
Oil, Gas and NGL Sales [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 1,686 296 3,017 958
Oil, Gas and NGL Sales [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 188 72 390 142
Oil, Gas and NGL Sales [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 280 56 504 131
Marketing and Midstream Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 966 331 1,787 891
Marketing and Midstream Revenues [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 610 140 1,109 469
Marketing and Midstream Revenues [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 134 81 281 175
Marketing and Midstream Revenues [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 222 $ 110 $ 397 $ 247