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Property, Plant and Equipment - Narrative (Details) | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) MMBoe | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) MMBoe | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | May 31, 2019 MMBoe
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  | $ 20,382,000 | $ 1,175,000 | [1] | $ 69,506,000 | [1] |  |  |  |
Asset retirement obligation settled |  |  |  |  | 25,544,000 | 11,510,000 |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | 227,000 | 54,000 | [1] | 127,434,000 | [1] |  |  |  |
Cost of acquired assets |  |  |  |  | 1,280,100,000 | 797,300,000 |  | 71,100,000 |  |  |  |  |
Impairment of assets |  |  |  |  | 0 | 20,000,000 | [1],[2] | 0 | [1],[2] |  |  |  |
Total capitalized exploratory well costs |  | $ 207,855,000 | $ 217,326,000 | $ 217,326,000 | 217,326,000 | $ 207,855,000 |  | 155,103,000 |  | $ 101,546,000 | $ 217,326,000 |  |
Exploratory well costs capitalized more than one year |  |  | 153,900,000 | 153,900,000 | 153,900,000 |  |  |  |  |  | 153,900,000 |  |
MP Gulf of Mexico LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Parent ownership interest |  | 80.00% |  |  |  | 80.00% |  |  |  |  |  |  |
MP Gulf of Mexico LLC | PAI (Final) |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest |  | 20.00% |  |  |  | 20.00% |  |  |  |  |  |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | MMBoe |  |  |  |  |  |  |  |  |  |  |  |  | 67
Acquisition, cash paid | $ 1,238,400,000 |  |  | 1,238,353,000 |  |  |  |  |  |  |  |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. [Member] | Sales Thresholds 2019 to 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  |  | 200,000,000 | 200,000,000 | 200,000,000 |  |  |  |  |  | 200,000,000 |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. [Member] | Net crude oil and condensate revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  |  | 50,000,000 | 50,000,000 | 50,000,000 |  |  |  |  |  | 50,000,000 |  |
PAI (Final) |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proved reserves | MMBoe |  | 97 |  |  |  | 97 |  |  |  |  |  |  |
Acquisition, cash paid |  | $ 780,700,000 |  |  |  |  |  |  |  |  | 780,678,000 |  |
PAI (Final) | Sales Thresholds 2019 to 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  | 150,000,000 | 150,000,000 | 150,000,000 | 150,000,000 | $ 150,000,000 |  |  |  |  | 150,000,000 |  |
PAI (Final) | Enhanced Oil Recovery Projects |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, maximum |  | $ 50,000,000 |  |  |  | 50,000,000 |  |  |  |  |  |  |
Athabasca Oil Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets, cash paid |  |  |  |  |  |  |  |  |  | 206,700,000 |  |  |
Athabasca Oil Corporation | Canadian Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets |  |  |  |  |  |  |  |  |  | 375,000,000.0 |  |  |
Western Canada |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property, plant and equipment |  |  |  |  |  |  |  | 48,800,000 |  |  |  |  |
Asset retirement obligation settled |  |  |  |  |  |  |  | 85,900,000 |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  | 129,000,000.0 |  |  |  |  |
Kaybob Duvernay Lands, Alberta | Athabasca Oil Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets, carried interest |  |  |  |  |  |  |  |  |  | $ 168,000,000.0 |  |  |
Carried interest paid |  |  | 152,700,000 | 152,700,000 | 152,700,000 |  |  |  |  |  | 152,700,000 |  |
Kaybob Duvernay Lands, Alberta | Athabasca Oil Corporation | Canadian Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  |  |  |  |  | 70.00% |  |  |
United States - Onshore |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  | 0 | 20,000,000 |  | 0 |  |  |  |  |
Placid Montney Lands, Alberta | Athabasca Oil Corporation | Canadian Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in assets acquired |  |  |  |  |  |  |  |  |  | 30.00% |  |  |
Brunei |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 57,500,000 | 57,500,000 | 57,500,000 |  |  |  |  |  | 57,500,000 |  |
Vietnam |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 69,100,000 | 69,100,000 | 69,100,000 |  |  |  |  |  | 69,100,000 |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired assets |  |  |  |  | 1,266,900,000 | 797,100,000 |  | 58,100,000 |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 27,400,000 | $ 27,400,000 | 27,400,000 |  |  |  |  |  | $ 27,400,000 |  |
Malaysia |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group including discontinued operation, consideration |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0 |
Gain (loss) on disposition of business |  |  | $ 985,400,000 |  | 985,400,000 |  |  |  |  |  |  |  |
Disposal group including discontinued operation, contingent consideration paid |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |
Cost of acquired assets |  |  |  |  | $ 0 | $ 0 |  | $ 0 |  |  |  |  |
[1] | Reclassified to conform with current presentation (see Note E)
[2] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.

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