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Acquisitions and Dispositions - Narrative (Details) $ in Billions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2024 USD ($) shares | Oct. 04, 2023 USD ($) | Oct. 04, 2023 CAD ($) | Nov. 30, 2024 USD ($) shares | Dec. 31, 2025 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Oct. 31, 2024 | Dec. 31, 2022
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues and other income |  |  |  |  |  |  |  |  | $ 61,548,000,000 | $ 56,953,000,000 | $ 58,574,000,000 |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | 7,988,000,000 | 9,245,000,000 | 10,957,000,000 |  |
Loss on forward contracts |  |  |  |  |  |  |  |  | $ 11,000,000 | (50,000,000) | $ 92,000,000 |  |
QatarEnergy LNG NFS3 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest of ConocoPhillips |  |  |  |  | 25.00% |  |  |  | 25.00% |  |  |  | 25.00%
North Field South | QatarEnergy LNG NFS3 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Port Arthur LNG |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest of ConocoPhillips |  |  |  |  | 30.00% |  |  | 30.00% | 30.00% |  | 30.00% |  |
Port Arthur LNG | Sempra |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership percentage |  |  |  |  |  |  |  | 70.00% |  |  | 70.00% |  |
Lower 48 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  | $ 5,264,000,000 | 5,175,000,000 | $ 6,461,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets | Lower 48 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  |  | Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  |  |  | 404,000,000 |  |  |  |
Gain (loss) on disposal, net of tax |  |  |  |  |  |  |  |  | 310,000,000 |  |  |  |
Net carrying value |  |  |  |  | $ 719,000,000 |  |  |  | 719,000,000 |  |  |  |
Disposal group including discontinued operation, net carrying value, asset |  |  |  |  | 770,000,000 |  |  |  | 770,000,000 |  |  |  |
Disposal group including discontinued operation, net carrying value, PP&E |  |  |  |  | 645,000,000 |  |  |  | 645,000,000 |  |  |  |
Disposal group, including discontinued operation, liabilities |  |  |  |  | 51,000,000 |  |  |  | 51,000,000 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Anadarko Basin |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  | $ 1,200,000,000 |  |  |  | $ 1,200,000,000 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ursa, Europa Fields, And Ursa Oil Pipeline Company LLC | Lower 48 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | $ 699,000,000 |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  | 274,000,000 |  |  |  |  |  |  |
Gain (loss) on disposal, net of tax |  |  |  |  |  | 266,000,000 |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  | 444,000,000 |  |  |  |  |  |  |
Disposal group including discontinued operation, net carrying value, asset |  |  |  |  |  | 536,000,000 |  |  |  |  |  |  |
Disposal group including discontinued operation, net carrying value, PP&E |  |  |  |  |  | 522,000,000 |  |  |  |  |  |  |
Disposal group, including discontinued operation, liabilities |  |  |  |  |  | $ 92,000,000 |  |  |  |  |  |  |
Marathon Oil Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 16,500,000,000 |  |  | $ 16,507,000,000 |  |  |  |  |  |  |  |  |
Business acquisition, entity shares issued per acquiree share | shares | 0.255 |  |  | 0.255 |  |  |  |  |  |  |  |  |
Proved properties | $ 13,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unproved properties | 10,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction-related costs |  |  |  |  |  |  | $ 587,000,000 |  |  | 587,000,000 |  |  |
Business acquisition, employee severance expense | 334,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues and other income |  |  |  |  |  |  |  |  |  | 677,000,000 |  |  |
Net Income (Loss) |  |  |  |  |  |  |  |  |  | $ 66,000,000 |  |  |
Marathon Oil Corporation | Lower 48 |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proved properties | 12,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Marathon Oil Corporation | Equatorial Guinea |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proved properties | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Prudhoe Bay |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  |  |  |  | 0.40% |  |  | 0.40% |  |  |
Alaska Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 296,000,000 |  |  |  |  |  |
Surmont |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | $ 3,000,000,000.0 | $ 4.1 |  |  |  |  |  |  |  |  |  |
Proved properties |  | 2,900,000,000 |  |  |  |  |  |  |  |  |  |  |
Unproved properties |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Operating revenues and other income |  |  |  |  |  |  |  | $ 572,000,000 |  |  |  |  |
Net Income (Loss) |  |  |  |  |  |  |  | $ 119,000,000 |  |  |  |  |
Interest acquired |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Interest subsequently acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Surmont | Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on forward contracts |  |  |  |  |  |  |  |  |  |  | $ 112,000,000 |  |
Kuparuk River Unit |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  |  |  |  | 5.00% |  |  | 5.00% |  |  |

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