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Discontinued Operations and Assets Held for Sale (Carrying Amounts of Assets and Liabilities Classified as Associated with Discontinued Operations on Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Cash restricted for discontinued operations $ 190 $ 380 $ 280
Accounts receivable 33 39  
Other current assets 6 7  
Oil and gas property and equipment, based on successful efforts accounting, net 590 751  
Other property and equipment, net 11 11  
Goodwill 88 88  
Other long-term assets 81 81  
Total assets associated with discontinued operations 809 977  
Accounts payable 20 19  
Revenues and royalties payable 45 47  
Other current liabilities 253 252  
Asset retirement obligations 145 141  
Other long-term liabilities 157 185  
Total liabilities associated with discontinued operations 620 644  
Barnett Shale [Member]      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Cash restricted for discontinued operations 20 25  
Accounts receivable 33 38  
Other current assets 6 5  
Oil and gas property and equipment, based on successful efforts accounting, net 590 751  
Other property and equipment, net 11 11  
Goodwill 88 88  
Total assets associated with discontinued operations 728 893  
Accounts payable 17 15  
Revenues and royalties payable 42 44  
Other current liabilities 215 19  
Asset retirement obligations 145 141  
Other long-term liabilities 14 16  
Total liabilities associated with discontinued operations 433 235  
Canada [Member]      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Cash restricted for discontinued operations 170 355  
Accounts receivable   1  
Other current assets   2  
Other long-term assets 81 81  
Total assets associated with discontinued operations 81 84  
Accounts payable 3 4  
Revenues and royalties payable 3 3  
Other current liabilities 38 233  
Other long-term liabilities 143 169  
Total liabilities associated with discontinued operations $ 187 $ 409