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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good or Service) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 755 $ 1,666 $ 2,122 $ 3,350
Oil, Gas and NGL Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 424 936 1,231 1,855
Oil, Gas and NGL Sales [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 296 750 958 1,409
Oil, Gas and NGL Sales [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 72 73 142 211
Oil, Gas and NGL Sales [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 56 113 131 235
Marketing Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 329 730 887 1,495
Marketing Revenues [Member] | Oil [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 140 394 469 750
Marketing Revenues [Member] | Gas [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 79 172 171 390
Marketing Revenues [Member] | NGL [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 110 164 247 355
Midstream Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers 2   4  
Marketing and Midstream Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenues from contracts with customers $ 331 $ 730 $ 891 $ 1,495