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Property, Plant and Equipment - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2019 USD ($) business | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 31, 2019 MMBoe | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of assets |  |  | $ 1,206,284,000 | $ 0 | $ 20,000,000 |  |
Total capitalized exploratory well costs |  |  | 181,616,000 | 217,326,000 | $ 207,855,000 |  | $ 155,103,000
Exploratory well costs capitalized more than one year |  |  | 181,600,000 |  |  |  |
MP Gulf of Mexico LLC |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Parent ownership interest |  |  |  |  | 80.00% |  |
MP Gulf of Mexico LLC | Petrobas America Inc |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  |  | 20.00% |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proved reserves | MMBoe |  |  |  |  |  | 67 |
Acquisition, cash paid |  | $ 1,236,165,000 |  |  |  |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. | Sales thresholds 2019 to 2025 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum |  |  | 200,000,000 |  |  |  |
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. | Net crude oil and condensate revenue |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum |  |  | 50,000,000.0 |  |  |  |
Petrobas America Inc |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Acquisition, cash paid |  |  |  |  | $ 780,700,000 |  |
Accumulated carried interest paid |  |  | 29,700,000 |  |  |  |
Petrobas America Inc | Sales thresholds 2019 to 2025 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum |  |  |  |  | 150,000,000.0 |  |
Petrobas America Inc | Enhanced oil recovery projects |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum |  |  |  |  | 50,000,000.0 |  |
Malaysia |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of divested businesses (in businesses) | business | 2 |  |  |  |  |  |
Disposal group including discontinued operation, consideration | $ 2,000,000,000.0 |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  | 985,400,000 |  |  |
Disposal group including discontinued operation, contingent consideration paid | $ 100,000,000.0 |  |  |  |  |  |
United States - Onshore |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of assets |  |  |  |  | 20,000,000.0 |  |
Vietnam |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 89,700,000 |  |  |  |
U.S. |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of assets |  |  | 1,152,515,000 | $ 0 | $ 20,000,000 |  |
Exploratory well costs capitalized more than one year |  |  | 45,900,000 |  |  |  |
Brunei |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 25,600,000 |  |  |  |
MEXICO |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | 15,500,000 |  |  |  |
Canada |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploratory well costs capitalized more than one year |  |  | $ 4,800,000 |  |  |  |

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