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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Billions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 CAD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Property | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2024 USD ($) | Apr. 30, 2020 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  | $ 3 |  |  |  |  |  |  | $ 182 | $ 37 |  |  |  |
Goodwill |  |  | $ 88 | 88 |  |  |  | $ 88 |  |  | 88 |  | $ 88 |  |  |
Cash restricted for discontinued operations |  |  | 190 | 190 |  |  |  | 380 | $ 280 |  | 190 | 280 | 380 |  |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  |  | 35 |  | 2 | 222 |  |  |  |
Foreign currency translation adjustment | [1] |  |  |  |  |  |  |  |  |  |  | $ 1,237 |  |  |  |
Canadian Divestiture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cash abandonment charges per quarter |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  | 3 |  |  | $ 179 | 748 |  |  |  |  |  |  |  |
Goodwill |  |  | 88 | 88 |  |  |  |  |  |  | 88 |  |  |  |  |
Contingent payments valuation |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash restricted for discontinued operations |  |  | 20 | 20 |  |  |  |  |  |  | 20 |  |  |  |  |
Estimated cash abandonment charges per quarter |  |  |  |  |  |  |  |  |  |  | $ 2 |  |  |  |  |
Number of oil and gas leases covering properties | Property |  |  |  |  |  |  |  |  |  |  | 4,500 |  |  |  |  |
Expense for litigation claim settlement costs |  |  |  | 28 |  |  |  |  |  |  |  |  |  |  |  |
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge on early retirement of debt, cash retirement costs |  |  |  |  |  |  |  |  | 52 |  |  |  |  |  |  |
Loss on early retirement of debt, noncash charges |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Canadian Business Segment [Member] | 4.00% due July 15, 2021 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt retired |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Debt interest rate, stated percentage |  |  |  |  |  |  |  |  | 4.00% |  |  | 4.00% |  |  |  |
Debt, maturity date |  |  |  |  |  |  |  |  | Jul. 15, 2021 |  |  |  |  |  |  |
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt retired |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Debt interest rate, stated percentage |  |  |  |  |  |  |  |  | 3.25% |  |  | 3.25% |  |  |  |
Debt, maturity date |  |  |  |  |  |  |  |  | May 15, 2022 |  |  |  |  |  |  |
BKV [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  | The contingent payment period commences on January 1, 2021 and has a term of four years. |  |  |  |  |
Asset impairments |  |  |  | 3 |  |  | $ 179 | $ 748 |  |  |  |  |  |  |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash restricted for discontinued operations |  |  | $ 170 | $ 170 |  |  |  |  |  |  | $ 170 |  |  |  |  |
Proceeds from the sale of business |  |  |  |  | $ 2,600 | $ 3.4 |  |  |  |  |  |  | 2,600 | $ 3.4 |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  |  |  |  |  |  | 223 |  |  |
Gain recognized on sale of business, after-tax |  |  |  |  |  |  |  |  |  |  |  |  | 425 |  |  |
Income taxes paid |  |  |  |  |  |  |  |  |  | $ 175 |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |
Subsequent Event [Member] | BKV [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of business |  | $ 490 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  | $ 260 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario Forecast [Member] | BKV [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The contingent payment period commences on January 1, 2021 and has a term of four years. |
Scenario Forecast [Member] | Maximum [Member] | BKV [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260 |
[1] | In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 17 for additional details.

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