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Discontinued Operations (Narrative) (Details) $ in Millions, $ in Billions |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Dec. 17, 2019 | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) MMcf | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | 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 |  |  |  |  |  |  |  |  |  |  | $ 182 | $ 785 |  |  |
Goodwill |  |  |  | $ 88 |  |  |  |  |  |  |  | 88 |  |  |
Restricted cash |  |  |  | 380 |  |  |  |  | $ 32 |  | 190 | 380 | $ 32 |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  |  |  |  | $ (1) | 222 | 2,593 |  |
Foreign currency translation adjustment | [1] |  |  |  |  |  |  |  |  |  |  | 1,237 |  |  |
Charge on early retirement of debt, cash retirement costs |  |  |  |  |  |  |  |  |  |  |  |  | 304 |  |
Settlement of long-term obligations duration |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |
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 |  |  |  |
Senior Notes [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 |  |  |  |  |  |  |  |  |  |  |  |  | 304 |  |
Loss on early retirement of debt, noncash charges |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |
EnLink and General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of business |  |  |  |  |  |  |  | $ 3,125 |  |  |  |  | 3,125 |  |
Gain recognized on sale of business, pre-tax |  |  |  |  |  |  |  | 2,600 |  |  |  |  | 2,600 |  |
Gain recognized on sale of business, after-tax |  |  |  |  |  |  |  | $ 2,200 |  |  |  |  | $ 2,200 |  |
Effective close date of divestiture |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 18, 2018 |  |
Cash income taxes |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |
Net cash outflows |  |  |  |  |  |  |  |  | $ 380 |  | $ 430 | 560 |  |  |
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 |  |  |  |  |  |  |  |  |  |  | expired at the end of 2020 |  |  |  |
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] | 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 |  |  |  |
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 |  |  |  |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments |  |  |  | 748 |  |  |  |  |  |  | $ 182 | 748 |  |  |
Goodwill |  |  |  | $ 88 |  |  |  |  |  |  |  | $ 88 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170
Contingent payments valuation |  |  |  |  |  |  |  |  |  |  | 66 |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Estimated cash abandonment charges per quarter |  |  |  |  |  |  |  |  |  |  | $ 2 |  |  |  |
Barnett Shale [Member] | Scenario Forecast [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. |
Barnett Shale [Member] | BKV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of estimated U.S. total proved reserves associated with divestiture assets |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of business |  | $ 490 |  |  |  |  |  |  |  |  |  |  |  |  |
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU |  | 2.75 |  |  |  |  |  |  |  |  |  |  |  |  |
WTI oil price for contingent earnout payment upside | $ / bbl |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  | The contingent payment period commences on January 1, 2021 and has a term of four years. |  |  |  |
Barnett Shale [Member] | BKV [Member] | Scenario Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 260 |
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  | $ 170 |  |  |  |
Proceeds from the sale of business |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |
Charge on early retirement of debt, cash retirement costs |  |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt, noncash charges |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Effective close date of divestiture |  |  |  |  |  |  |  |  |  |  |  | Jun. 27, 2019 |  |  |
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% |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Debt, maturity date |  |  |  |  | May 15, 2022 |  |  |  |  |  |  |  |  |  |
[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 19 for additional details.

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