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Acquisition and Divestitures (Narrative) (Details) $ / shares in Units, $ in Millions, $ in Billions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 48 Months Ended |
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Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 CAD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) MMBoe | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2024 | Apr. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  | $ 3 |  |  |  |  |  |  | $ 182 | $ 37 |  |  |  |
Gain recognized on sale of business, pre tax |  |  |  |  |  |  | $ 35 |  | $ 2 | 222 |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  | $ 1 |  |  | $ 48 |  |  |  |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Agreement |  |  |  |  |  |  |  |  | Sep. 26, 2020 |  |  |  |  |
Per share conversion | $ / shares |  |  |  |  |  |  |  |  | $ 0.5165 |  |  |  |  |
Non Core Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestitures of property and equipment |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |
Gain on asset dispositions |  |  |  |  |  |  |  | $ 45 |  |  |  |  |  |
Total estimated proved reserves | MMBoe |  |  |  |  |  |  |  | 25 |  |  |  |  |  |
Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  | 3 |  |  | $ 179 | $ 748 |  |  |  |  |  |  |  |
BKV [Member] | Barnett Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [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 impairment charges |  | $ 3 |  |  | $ 179 | $ 748 |  |  |  |  |  |  |  |
BKV [Member] | Barnett Shale [Member] | Scenario Forecast [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. |
BKV [Member] | Barnett Shale [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from 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, net of tax |  |  |  |  |  |  |  |  |  |  | $ 425 |  |  |

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