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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
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Cash restricted for discontinued operations $ 195 $ 380 $ 370
Accounts receivable 49 39  
Other current assets 7 7  
Oil and gas property and equipment, based on successful efforts accounting, net 593 751  
Other property and equipment, net 11 11  
Goodwill 88 88  
Other long-term assets 82 81  
Total assets associated with discontinued operations 830 977  
Accounts payable 21 19  
Revenues and royalties payable 36 47  
Other current liabilities 241 252  
Asset retirement obligations 143 141  
Other long-term liabilities 162 185  
Total liabilities associated with discontinued operations 603 644  
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 47 38  
Other current assets 5 5  
Oil and gas property and equipment, based on successful efforts accounting, net 593 751  
Other property and equipment, net 11 11  
Goodwill 88 88  
Total assets associated with discontinued operations 744 893  
Accounts payable 18 15  
Revenues and royalties payable 33 44  
Other current liabilities 188 19  
Asset retirement obligations 143 141  
Other long-term liabilities 15 16  
Total liabilities associated with discontinued operations 397 235  
Canada [Member]      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Cash restricted for discontinued operations 175 355  
Accounts receivable 2 1  
Other current assets 2 2  
Other long-term assets 82 81  
Total assets associated with discontinued operations 86 84  
Accounts payable 3 4  
Revenues and royalties payable 3 3  
Other current liabilities 53 233  
Other long-term liabilities 147 169  
Total liabilities associated with discontinued operations $ 206 $ 409