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Acquisition and Divestitures (Narrative) (Details) $ in Millions, $ in Billions |  |  | 3 Months Ended | 12 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) | Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) MMBoe | Jun. 30, 2020 USD ($) | Jun. 30, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) MMBoe | Dec. 31, 2019 USD ($) MMBoe | Dec. 31, 2018 USD ($) MMBoe | Dec. 31, 2024 | Jan. 07, 2021 USD ($) shares | Apr. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  | $ 38 |  |  | $ 38 |  |  |  | $ 38 | $ 38 |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 182 | 785 |  |  |  |
Gain recognized on sale of business, pre tax |  |  |  |  |  |  |  |  |  |  |  | $ (1) | $ 222 | $ 2,593 |  |  |
Total estimated proved reserves | MMBoe | [1] |  |  |  |  |  |  |  |  |  |  | 2 | 54 | 24 |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 48 | $ 278 |  |  |
Non Core Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  |  |  | $ 12 |  |  |  |  |  |  |  | $ 390 | $ 500 |  |  |
Total estimated proved reserves | MMBoe |  |  |  |  | 3 |  |  |  |  |  |  |  | 54 | 24 |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  |  |  |  |  |  | $ 48 | $ 278 |  |  |
Non Core Assets [Member] | Johnson County and Wise County Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |
Gain recognized on sale of business, pre tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |  |
Settlement expenses relating to gas processing contracts |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |
EnLink and General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from 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, net of tax |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  | $ 2,200 |  |  |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170
Divestitures of property and equipment |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  | $ 748 |  |  |  | $ 182 | 748 |  |  |  |
Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  |  |  | $ 2,600 | $ 3.4 |  |  |  |  |  |  |
Gain recognized on sale of business, pre tax |  |  |  |  |  |  |  |  | 223 |  |  |  |  |  |  |  |
Gain recognized on sale of business, net of tax |  |  |  |  |  |  |  |  | $ 425 |  |  |  |  |  |  |  |
Canadian Business Segment [Member] | Canadian Natural Resources Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | $ 2,600 | $ 3.4 |  |  |  |  |  |  |  |  |  |
Gain recognized on sale of business, pre tax |  |  |  |  |  |  |  |  |  |  |  |  | 223 |  |  |  |
Gain recognized on sale of business, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 425 |  |  |  |
Scenario Forecast [Member] | Non Core Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payments |  |  |  | $ 8 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario Forecast [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent earnout payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The contingent payment period commences on January 1, 2021 and has a term of four years. |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400 |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Agreement |  |  |  |  |  |  |  |  |  |  |  | Jan. 07, 2021 |  |  |  |  |
Common Stock Shares Issued |  |  |  |  | $ 5,400 |  |  |  |  |  |  | $ 5,400 |  |  |  |  |
Devon and WPX Agreement [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of bond |  | $ 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium paid on redemption of bonds |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Devon and WPX Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share conversion | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5165 |
[1] | Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.

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