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Divestitures (Narrative) (Details) $ in Billions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 27, 2019 USD ($) MMBoe | Jun. 27, 2019 CAD ($) MMBoe | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) MMBoe | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain recognized on sale of business, pre tax |  |  | $ 189,000,000 |  |  | $ 189,000,000 |
Asset retirement obligations assumed by other party |  |  |  |  |  | 40,000,000 | $ 58,000,000
Gain recognized |  |  | 1,000,000 |  | $ (23,000,000) | 45,000,000 | $ (11,000,000)
Barnett Shale [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net assets |  |  | $ 1,400,000,000 |  |  | $ 1,400,000,000 |
Permian Basin [Member] | Non Core Assets [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total estimated proved reserves | MMBoe |  |  |  | 25 |  |  |
Divestitures of property and equipment |  |  |  | $ 300,000,000 |  |  |
Gain recognized |  |  |  | $ 44,000,000 |  |  |
Permian Basin [Member] | Non Core Assets [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of estimated U.S. total proved reserves associated with divestiture assets. |  |  |  | 2.00% |  |  |
Barnett Shale Johnson County [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset retirement obligations assumed by other party |  |  |  |  | $ 34,000,000 |  |
Percentage of proved reserves associated with divestiture assets compared to total estimated proved reserves |  |  |  |  | 10.00% |  |
Divestitures of property and equipment |  |  |  |  | $ 553,000,000 |  |
Gain recognized |  |  |  |  | 0 |  |
Settlement expenses relating to gas processing contracts |  |  |  |  | $ 40,000,000 |  |
Canadian​ Divestiture [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Restructuring and asset impairment related charges | $ 273,000,000 |  |  |  |  |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business, net of purchase price adjustments | $ 2,600,000,000 | $ 3.4 |  |  |  |  |
Effective close date of divestiture | Jun. 27, 2019 | Jun. 27, 2019 |  |  |  |  |
Gain recognized on sale of business, pre tax | $ 189,000,000 |  |  |  |  |  |
Gain recognized on sale of business, net of tax | 460,000,000 |  |  |  |  |  |
Asset retirement obligations assumed by other party | $ 436,000,000 |  |  |  |  |  |
Total estimated proved reserves | MMBoe | 400 | 400 |  |  |  |  |
Percentage of proved reserves associated with divestiture assets compared to total estimated proved reserves | 21.00% | 21.00% |  |  |  |  |

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