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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Billions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 27, 2019 USD ($) | Jun. 27, 2019 CAD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) MMcf | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sale of aggregate ownership interests, before-tax |  |  |  |  | $ 189 |  |  | $ 189 |  |
Foreign currency translation adjustment | [1] |  |  |  | 1,237 |  |  | 1,237 |  |
Cash restricted for discontinued operations |  |  |  |  | 370 |  |  | 370 |  |
Loss on early retirement of debt, cash retirement costs |  |  |  |  |  |  |  |  | $ 304 |
Assets related to divestiture |  |  |  |  | 230 |  |  | 230 |  | $ 4,269
Liabilities related to divestiture |  |  |  |  | $ 2,083 |  |  | $ 2,083 |  | 2,623
Non-Core Upstream Assets [Member] | Permian Basin [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Assets related to divestiture |  |  |  |  |  |  |  |  |  | 197
Liabilities related to divestiture |  |  |  |  |  |  |  |  |  | $ 69
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt, cash retirement costs |  |  |  |  |  |  | $ 304 |  |  |
Loss on early retirement of debt, noncash charges |  |  |  |  |  |  | $ 8 |  |  |
4.00% due July 15, 2021 [Member] | Senior Notes [Member] | Scenario Forecast [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% |  |  |  |  |  |
Debt, maturity date |  |  |  | Jul. 15, 2021 |  |  |  |  |  |
3.25% due May 15, 2022 [Member] | Senior Notes [Member] | Scenario Forecast [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% |  |  |  |  |  |
Debt, maturity date |  |  |  | May 15, 2022 |  |  |  |  |  |
Canadian​ Divestiture [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | $ 273 |  |  |  |  |  |  |  |
Estimated cash abandonment charges per quarter |  | 6 |  |  |  |  |  |  |  |
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred tax asset |  | 34 |  |  |  |  |  |  |  |
Canadian Business Segment [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Loss 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] | Scenario Forecast [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% |  |  |  |  |  |
Debt, maturity date |  |  |  | Jul. 15, 2021 |  |  |  |  |  |
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member] | Scenario Forecast [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% |  |  |  |  |  |
Debt, maturity date |  |  |  | May 15, 2022 |  |  |  |  |  |
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Firm Transportation Agreement Abandonment Charge [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | 154 |  |  |  |  |  |  |  |
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Office Lease Abandonment and Related Asset Impairment Charges [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | 55 |  |  |  |  |  |  |  |
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Employee Related Costs [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring costs and asset impairment charges |  | 64 |  |  |  |  |  |  |  |
Expense associated with accelerated awards |  | $ 40 |  |  |  |  |  |  |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Effective close date of divestiture |  | Jun. 27, 2019 | Jun. 27, 2019 |  |  |  |  |  |  |
Proceeds from sale of aggregate ownership interests |  | $ 2,600 | $ 3.4 |  |  |  |  |  |  |
Gain on sale of aggregate ownership interests, before-tax |  | 189 |  |  |  |  |  |  |  |
Gain on sale of aggregate ownership interests, after-tax |  | 460 |  |  |  |  |  |  |  |
Cash income taxes |  | 110 |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  | 1,200 |  |  |  |  |  |  |  |
Cash restricted for discontinued operations |  | 370 |  |  |  |  |  |  |  |
Restructuring costs reimbursed |  | $ 50 |  |  |  |  |  |  |  |
EnLink and General Partner [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Effective close date of divestiture |  |  |  |  |  |  |  | Jul. 18, 2018 |  |
Proceeds from sale of aggregate ownership interests |  |  |  |  |  | $ 3,125 |  |  |  |
Gain on sale of aggregate ownership interests, before-tax |  |  |  |  |  | 2,600 |  |  |  |
Gain on sale of aggregate ownership interests, after-tax |  |  |  |  |  | 2,200 |  |  |  |
Cash income taxes |  |  |  |  |  | $ 12 |  |  |  |
Net cash outflows |  |  |  |  |  |  |  | $ 280 |  |
EnLink and General Partner [Member] | Chisholm Gathering and Processing Contract [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Gathering and processing minimum volume commitments period end |  |  |  |  |  |  |  | early 2021 |  |
EnLink and General Partner [Member] | Bridgeport and Cana Gathering and Processing Contracts [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment Termination Date |  |  |  |  |  |  |  | Dec. 31, 2029 |  |
EnLink and General Partner [Member] | Minimum [Member] | Chisholm Gathering and Processing Contract [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum gathering volume commitment | MMcf |  |  |  |  |  |  |  | 77 |  |
Minimum processing volume commitment | MMcf |  |  |  |  |  |  |  | 77 |  |
EnLink and General Partner [Member] | Maximum [Member] | Chisholm Gathering and Processing Contract [Member] |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum gathering volume commitment | MMcf |  |  |  |  |  |  |  | 128 |  |
Minimum processing volume commitment | MMcf |  |  |  |  |  |  |  | 128 |  |
[1] | In conjunction with the sale of all of its Canadian operating assets, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 18 for additional details.

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