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Assets Held for Sale, Sold or Acquired Textuals (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Oct. 31, 2019 | Sep. 30, 2019 | Apr. 30, 2019 | Oct. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | May 17, 2017 | Jul. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 02, 2019 | Jan. 31, 2019 | Dec. 18, 2018
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 779,000,000 | $ 1,074,000,000 | $ 772,000,000 |  |  |
Exploration Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 743,000,000 | 369,000,000 | 934,000,000 |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,358,000,000 | 173,000,000 | 529,000,000 |  |  |
Equity Method Investments |  |  |  |  |  |  | $ 8,234,000,000 |  |  | $ 9,005,000,000 |  |  |  |  |  | 8,234,000,000 | 9,005,000,000 |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 779,000,000 | 1,074,000,000 | 772,000,000 |  |  |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Alaska Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 6,000,000 | 7,000,000 |  |  |
Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (159,000,000) | 1,000,000 | 5,000,000 |  |  |
Canada Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 197,000,000 |  |  |
Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 461,000,000 | 323,000,000 | 29,000,000 |  |  |
Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 470,000,000 | 744,000,000 | 534,000,000 |  |  |
Australia West Assets [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  | 1,200,000,000 |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  |  | 1,200,000,000 |  |  |  |  |
Working Capital and cash in net carrying value |  | (300,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of deferred taxes in carrying value of asset |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 372,000,000 | 364,000,000 | 317,000,000 |  |  |
Australia West Assets [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  | 1,390,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia West Sale Contingent Proceeds upon Final Investment Decision |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia West Assets [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  | $ 700,000,000 |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |
Barossa project [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  | 37.50% |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |
Darwin LNG Facility [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  | 56.90% |  |  |  |  |  |  |  |  | 56.90% |  |  |  |  |
Poseidon Field [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Athena Field [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Niobrara [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 390,000,000 |  |
Amount of PP&E in carrying value of asset |  |  |  |  |  |  | $ 426,000,000 |  |  |  |  |  |  |  |  | $ 426,000,000 |  |  | 426,000,000 |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (372,000,000) | 35,000,000 | (12,000,000) |  |  |
Impairment of assets in exchange |  |  |  |  |  |  | 379,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exploration Expense |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Niobrara [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  | 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Niobrara [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  |  |  |  |  | 34,000,000 |  |  |  |  |  |  |  |  | 34,000,000 |  |  | $ 34,000,000 |  |
Golden Pass [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.40% |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  | $ (60,000,000) |  |  |  |  |  |  |  |  |  |  |  |
U.K. Subsidiaries [Member] | Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working Capital and cash in net carrying value |  |  | (100,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of deferred taxes in carrying value of asset |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative foreign currency translation adjustments |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 | 900,000,000 | 300,000,000 |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 |  |  |  |  |
After-tax gain (loss) on disposition |  |  |  |  |  |  | 2,100,000,000 |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |  |  |
U.K. Subsidiaries [Member] | Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  | $ 2,675,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.K. Subsidiaries [Member] | Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Greater Sunrise Fields [Member] | Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After-tax gain (loss) on disposition |  |  |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Magnolia Field And Platform [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  | 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Magnolia Field And Platform [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation at disposal |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |
Other properties [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  |  |  |  |  |  | $ 112,000,000 |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Other properties [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions | $ 186,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undeveloped Leasehold Assets [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  |  |  | 162,000,000 | $ 56,000,000 | $ 105,000,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  | 140,000,000 |  | 0 |  |  |  |  |  |  |  |  |
Barnett [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  | $ 196,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  | 201,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (59,000,000) | (566,000,000) |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset |  |  |  |  |  |  |  |  |  | 87,000,000 |  |  |  |  |  |  | 87,000,000 | 572,000,000 |  |  |
Barnett [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation at disposal |  |  |  |  | $ 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.K. subsidiary holding Clair field | Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  |  |  | 253,000,000 |  |  |  |  |  |  |  |  |  |  |
Ownership Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.50%
Ownership percentage retained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Fair Value Assets Disposed Of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,743,000,000
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,028,000,000
Amount of PP&E in carrying value of asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,553,000,000
Amount of deferred taxes in carrying value of asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 485,000,000
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 748,000,000 | (400,000) |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  | $ 715,000,000 |  |  |  |  |  |  |  |  |  |  |
U.K. subsidiary holding Clair field | Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,000,000
Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member] | Canada Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000,000.0 |  |  |  |  |  |  |
Shares Exchanged for Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 208 |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,000,000 | 95,000,000 | 2,100,000,000 |  |  |
Business Combination, Contingent Consideration Arrangements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Contingent Consideration Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The contingent payment, calculated and paid on a quarterly basis, is $6 million CAD for every $1 CAD by which the WCS quarterly average crude price exceeds $52 CAD per barrel. |  |  |  |  |
Cenovus Energy common share price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.41 |  |  |  |  |  |  |
Cenovus Energy Investment at Cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,960,000,000 |  |  |  |  |  |  |
Foster Creek Christina Lake (FCCL) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Foster Creek Christina Lake (FCCL) [Member] | Canada Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Equity Investment Sold |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,900,000,000 |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,000,000 |  |  |
Western Canada Gas Properties [Member] | Canada Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000,000 |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600,000,000 |  |  |  |  |  |  |
Total current liabilities of assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,000,000) |  |  |
Western Canada Gas Properties [Member] | Canada Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 585,000,000 |  |  |  |  |  |  |
San Juan Basin [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000,000 |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000,000 |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,200,000,000) |  |  |
Impairment of asset held for sale |  |  |  |  |  |  |  |  |  |  |  | $ 3,300,000,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (22,000,000) | $ 0 | $ 28,000,000 |  |  |  |
Business Combination, Contingent Consideration Arrangements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Held for Sale, Contingent Consideration Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The transaction includes a contingent payment of up to $300 million. The six-year contingent payment, effective beginning January 1, 2018, is due annually for the periods in which the monthly U.S. Henry Hub price is at or above $3.20 per MMBTU. |  |  |  |  |  |
San Juan Basin [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 406,000,000 |  |  |  |  |  |
Panhandle [Member] | Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Held For Sale Transaction Detail [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  | $ 178,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  | 206,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of PP&E in carrying value of asset |  |  |  |  |  | 279,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income related items for assets held for sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results Of Operations Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (14,000,000) |  |  |
Gain (Loss) on Disposition of Oil and Gas Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  | $ (28,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Panhandle [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Retirement Obligation of held for sale or sold |  |  | $ 72,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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