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Employee Benefit Plans - Narrative (Details) $ / shares in Units, shares in Millions | 12 Months Ended |
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Dec. 31, 2025 USD ($) installment $ / shares shares | Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2013 | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) |  |
Settlements (loss) gain | $ (5,000,000) | $ 1,000,000 | $ (6,000,000) |  |
Percent amortized for net actuarial gains and losses | 10.00% | 10.00% | 10.00% |  |
Severance expense | $ 286,000,000 |  |  |  |
Aggregate intrinsic value, exercised | (60,000,000) |  |  |  |
Corporate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 72,000,000 |  |  |  |
Alaska |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 43,000,000 |  |  |  |
Lower 48 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 87,000,000 |  |  |  |
Canada |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 29,000,000 |  |  |  |
Europe, Middle East and North Africa |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 48,000,000 |  |  |  |
Asia Pacific |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 7,000,000 |  |  |  |
Production and Operating Expenses |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | 214,000,000 |  |  |  |
Selling, General and Administrative Expenses |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Severance expense | $ 72,000,000 |  |  |  |
Share-based Payment Arrangement, Option |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Vesting period | 6 months |  |  |  |
Expiration period | 10 years |  |  |  |
Restricted Stock Units (RSUs) | Discontinued Operations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 98.68 | $ 111.91 | $ 115.88 |  |
Total fair value, issued | $ 12,000,000 | $ 35,000,000 | $ 46,000,000 |  |
RSU Stock Settled |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unrecognized compensation cost from stock options | $ 188,000,000 |  |  |  |
Weighted average period of recognition of unvested options | 1 year 8 months 15 days |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 99.26 | $ 109.79 | $ 110.91 |  |
Total fair value, issued | $ 285,000,000 | $ 410,000,000 | $ 284,000,000 |  |
PSU Cash Settled and Stock Settled |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
PSUs, authorization period | 3 years |  |  |  |
PSU Cash Settled Program |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unrecognized compensation cost from stock options | $ 0 |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 100.90 | $ 110.39 | $ 112.50 |  |
Total fair value, issued | $ 66,000,000 | $ 171,000,000 | $ 111,000,000 |  |
Vesting period | 5 years |  |  |  |
PSUs, authorization period | 3 years |  |  | 3 years |
PSU Stock Settled |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unrecognized compensation cost from stock options | $ 0 |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 100.90 | $ 110.39 | $ 112.50 |  |
Total fair value, issued | $ 18,000,000 | $ 23,000,000 | $ 29,000,000 |  |
Vesting period | 5 years |  |  |  |
PSUs, authorization period | 3 years |  |  |  |
PSUs, requisite period | 5 years |  |  |  |
Twenty Fourteen Omnibus Stock and Performance Incentive Plan Of Conoco Phillips |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share based compensation plan, number of shares authorized | shares | 36 |  |  |  |
Twenty Fourteen Omnibus Stock and Performance Incentive Plan Of Conoco Phillips | Share-based Payment Arrangement, Option |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average remaining contractual term of outstanding options | 1 year 10 days |  |  |  |
Aggregate intrinsic value, exercised |  | $ (63,000,000) | $ (58,000,000) |  |
Cash received from exercise of stock options | $ 15,000,000 |  |  |  |
Stock options exercised, cashless | 27,000,000 |  |  |  |
Tax benefit from exercise of options | $ 13,000,000 |  |  |  |
Omnibus Plan, General And Executive RSU Program | Restricted Stock Units (RSUs) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of vesting installments | installment | 1 |  |  |  |
Employee Severance |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | Shipping and Handling Costs, Operating expenses and selling, general and administrative expenses | Shipping and Handling Costs, Operating expenses and selling, general and administrative expenses | Shipping and Handling Costs, Operating expenses and selling, general and administrative expenses |  |
Restructuring reserve | $ 378,000,000 | $ 331,000,000 | $ 12,000,000 |  | $ 31,000,000
Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | $ 40,000,000 | 42,000,000 |  |  |
Defined Benefit Plan, Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocations for plan assets, percentage | 28.00% |  |  |  |
Corporate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocations for plan assets, percentage | 68.00% |  |  |  |
Real estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocations for plan assets, percentage | 4.00% |  |  |  |
Other Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlements (loss) gain | $ 0 | 0 | 0 |  |
Other Benefits | Twenty Fourteen Omnibus Stock and Performance Incentive Plan Of Conoco Phillips |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Omnibus stock and performance incentive plan life | 10 years |  |  |  |
U.S. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected future employer contributions, next fiscal year | $ 160,000,000 |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense | 160,000,000 | 152,000,000 | 151,000,000 |  |
U.S. | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlements (loss) gain | (5,000,000) | 0 | (6,000,000) |  |
Accumulated benefit obligation | 1,767,000,000 | 1,703,000,000 |  |  |
Expected future employer contributions, next fiscal year | 116,000,000 |  |  |  |
U.S. | Pension Benefits | Level 3 | Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | 40,000,000 | 42,000,000 |  |  |
Accumulated benefit obligation | 67,000,000 | 71,000,000 |  |  |
U.S. | Pension Benefits | Corporate | Level 3 | Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | 107,000,000 | 113,000,000 |  |  |
Int’l. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected future employer contributions, next fiscal year | 60,000,000 |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense | 27,000,000 | 25,000,000 | 23,000,000 |  |
Int’l. | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlements (loss) gain | 0 | 1,000,000 | $ 0 |  |
Accumulated benefit obligation | $ 2,577,000,000 | $ 2,392,000,000 |  |  |
COP Pre Sixty Five Retiree | U.S. | Other Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Health care cost trend rate, next fiscal year | 6.50% |  |  |  |
Ultimate health care cost trend rate | 5.00% |  |  |  |
Post Sixty Five Retiree | U.S. | Other Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Health care cost trend rate, next fiscal year | 4.70% |  |  |  |
Ultimate health care cost trend rate | 5.00% |  |  |  |

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- Definition Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482943/710-10-55-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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