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Discontinued Operations (Carrying Amounts of Assets and Liabilities Classified as Associated with Discontinued Operations on Consolidated Balance Sheets) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Accounts receivable $ 39
Other current assets 7
Oil and gas property and equipment, based on successful efforts accounting, net 751
Other property and equipment, net 11
Goodwill 88
Other long-term assets 81
Total assets associated with discontinued operations 977
Accounts payable 19
Revenues and royalties payable 47
Other current liabilities 252
Asset retirement obligations 141
Other long-term liabilities 185
Total liabilities associated with discontinued operations 644
Barnett Shale [Member]  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Accounts receivable 38
Other current assets 5
Oil and gas property and equipment, based on successful efforts accounting, net 751
Other property and equipment, net 11
Goodwill 88
Total assets associated with discontinued operations 893
Accounts payable 15
Revenues and royalties payable 44
Other current liabilities 19
Asset retirement obligations 141
Other long-term liabilities 16
Total liabilities associated with discontinued operations 235
Canada [Member]  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Accounts receivable 1
Other current assets 2
Other long-term assets 81
Total assets associated with discontinued operations 84
Accounts payable 4
Revenues and royalties payable 3
Other current liabilities 233
Other long-term liabilities 169
Total liabilities associated with discontinued operations $ 409