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Revenue - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Allowance for doubtful accounts $ (1) $ (30)
Total accounts receivable, net 815 746
Oil, natural gas and NGL sales    
Disaggregation of Revenue [Line Items]    
Accounts receivable, gross 670 589
Joint interest    
Disaggregation of Revenue [Line Items]    
Accounts receivable, gross 105 119
Other    
Disaggregation of Revenue [Line Items]    
Accounts receivable, gross $ 41 $ 68