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Acquisitions and Dispositions - Narrative (Details) $ in Billions |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2024 USD ($) shares | Oct. 04, 2023 USD ($) | Feb. 28, 2025 USD ($) | Nov. 30, 2024 USD ($) | Oct. 31, 2023 | Mar. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) | Oct. 04, 2023 CAD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Transaction-related costs |  |  |  |  |  | $ 23,000,000 | $ 568,000,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Ursa And Europa Fields, Ursa Oil Pipeline Company LLC, And Shell Pipeline Company LP | Lower 48 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  | $ 735,000,000 |  |  |  |  |  |
Net carrying value |  |  | 394,000,000 |  |  |  |  |  |
Disposal group including discontinued operation, net carrying value, PP&E |  |  | 496,000,000 |  |  |  |  |  |
Disposal group, including discontinued operation, liabilities |  |  | $ 102,000,000 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets | Lower 48 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | 581,000,000 |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  | 64,000,000 |  |  |
Gain (loss) on disposal, net of tax |  |  |  |  |  | 49,000,000 |  |  |
Net carrying value |  |  |  |  |  | 517,000,000 | 517,000,000 | $ 517,000,000 |
Disposal group including discontinued operation, net carrying value, PP&E |  |  |  |  |  | 553,000,000 | 553,000,000 | 553,000,000 |
Disposal group, including discontinued operation, liabilities |  |  |  |  |  | 36,000,000 | $ 36,000,000 | 36,000,000 |
Marathon Oil Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total consideration | $ 16,500,000,000 |  |  | $ 16,507,000,000 |  |  |  |  |
Common stock, number of Marathon Oil shares received for each share of ConocoPhillips common stock | shares | 0.255 |  |  |  |  |  |  |  |
Proved properties | $ 13,000,000,000 |  |  |  |  |  |  |  |
Unproved properties | 11,000,000,000 |  |  |  |  |  |  |  |
Marathon Oil Corporation | Lower 48 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proved properties | 12,000,000,000 |  |  |  |  |  |  |  |
Marathon Oil Corporation | Equatorial Guinea |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proved properties | $ 1,000,000,000 |  |  |  |  |  |  |  |
Surmont |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 50.00% |  |  |  |  |  |  | 50.00%
Business acquisition, maximum payment |  | $ 320,000,000 |  |  |  |  |  |  | $ 0.4
Business acquisition, contingent payment term |  |  |  |  | 5 years |  |  |  |
Business acquisition, cost per every dollar exceeding threshold |  | $ 2,000,000 |  |  |  |  |  |  |
Business acquisition, threshold (dollars per barrel) |  | 52 |  |  |  |  |  |  |
Contingent consideration, outcome, high |  | $ 300,000,000 |  |  |  |  |  |  |
Contingent consideration payments |  |  |  |  |  | $ 39,000,000 |  | $ 197,000,000 |

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