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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 |

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