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Dispositions - International Segment (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income before income taxes   $ (310,000,000) $ 175,000,000 $ (1,124,000,000) $ 395,000,000
International E&P | U.K. Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and gas property and equipment $ 95,000,000        
Gain on disposition of business     14,000,000    
Income before income taxes     0   $ 28,000,000
International E&P | Atrush Block in Kurdistan | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and gas property and equipment     $ 63,000,000    
Percentage of oil and gas property disposed     15.00%