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Divestitures and Other Transactions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 29, 2021
Mar. 31, 2021
Jun. 30, 2021
Disposed of by Sale, Not Discontinued Operations | Permian Basin | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net proceeds from sale $ 475    
Disposed of by Sale, Not Discontinued Operations | DJ Basin      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net proceeds from sale   $ 280  
Discontinued Operations, Held-for-sale | Permian Basin      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property, plant and equipment, net     $ 525
Asset retirement obligation     $ 50