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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 22, 2024 | Jul. 31, 2025 | Nov. 30, 2024 | Dec. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2025
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Transaction-related costs |  |  |  |  | $ 2 |  |  | $ 42 | $ 587
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets | Lower 48 |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  | $ 581 |  |
Before-tax gain (loss) on disposition |  |  |  |  |  |  | 64 |  |
Gain (loss) on disposal, net of tax |  |  |  |  |  |  | $ 49 |  |
Net carrying value |  |  |  |  |  | $ 517 |  |  |
Disposal group including discontinued operation, net carrying value, PP&E |  |  |  |  |  | 553 |  |  |
Disposal group, including discontinued operation, liabilities |  |  |  |  |  | 36 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ursa And Europa Fields, Ursa Oil Pipeline Company LLC, And Shell Pipeline Company LP | Lower 48 |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | 718 |  |  |
Before-tax gain (loss) on disposition |  |  |  |  |  | 274 |  |  |
Gain (loss) on disposal, net of tax |  |  |  |  |  | $ 266 |  |  |
Net carrying value |  |  |  |  | 444 |  |  | 444 | 444
Disposal group including discontinued operation, net carrying value, assets |  |  |  |  | 536 |  |  | 536 | 536
Disposal group including discontinued operation, net carrying value, PP&E |  |  |  |  | 522 |  |  | 522 | 522
Disposal group, including discontinued operation, liabilities |  |  |  |  | 92 |  |  | 92 | 92
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lower 48 Assets In Anadarko Basin |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  | $ 1,300 |  |  |  |  |  |  |
Disposal group including discontinued operation, net carrying value, assets |  |  |  |  | $ 1,200 |  |  | $ 1,200 | $ 1,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lower 48 Assets In Anadarko Basin | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  | $ 500 |  |  |  |  |
Marathon Oil Corporation |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Total consideration | $ 16,500 |  | $ 16,507 |  |  |  |  |  |
Common stock, number of Marathon Oil shares received for each share of ConocoPhillips common stock | 0.255 |  |  |  |  |  |  |  |
Proved properties | $ 13,000 |  |  |  |  |  |  |  |
Unproved properties | 11,000 |  |  |  |  |  |  |  |
Marathon Oil Corporation | Lower 48 |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proved properties | 12,000 |  |  |  |  |  |  |  |
Marathon Oil Corporation | Equatorial Guinea |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Proved properties | $ 1,000 |  |  |  |  |  |  |  |

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- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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