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Employee Benefit Plans - Narrative (Details) $ / shares in Units, shares in Millions | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2024 USD ($) shares | Dec. 31, 2024 USD ($) installment $ / shares shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2013 | Dec. 31, 2021 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 |  |  | $ 6,000,000 | $ 37,000,000 |  |
Percent amortized for net actuarial gains and losses |  | 10.00% | 10.00% | 10.00% |  |
Aggregate Intrinsic Value, Exercised |  | $ (63,000,000) |  |  |  |
Income Tax Expense (Benefit) |  | $ (4,427,000,000) | $ (5,331,000,000) | $ (9,548,000,000) |  |
Marathon Oil Corporation |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit) | $ 394,000,000 |  |  |  |  |
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 |  | $ 111.91 | $ 115.88 | $ 96.20 |  |
Total fair value, issued |  | $ 35,000,000 | $ 46,000,000 | $ 40,000,000 |  |
RSU Stock Settled |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Unrecognized compensation cost from stock options | 212,000,000 | $ 212,000,000 |  |  |  |
Weighted average period of recognition of unvested options |  | 1 year 7 months 17 days |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares |  | $ 109.79 | $ 110.91 | $ 90.57 |  |
Total fair value, issued |  | $ 410,000,000 | $ 284,000,000 | $ 193,000,000 |  |
RSU Cash Settled |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Total fair value, issued |  |  |  | $ 21,000,000 |  |
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 | $ 0 |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares |  | $ 110.39 | $ 112.50 | $ 91.58 |  |
Total fair value, issued |  | $ 171,000,000 | $ 111,000,000 | $ 88,000,000 |  |
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 | $ 0 |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares |  | $ 110.39 | $ 112.50 | $ 91.58 |  |
Total fair value, issued |  | $ 23,000,000 | $ 29,000,000 | $ 21,000,000 |  |
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 | 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 5 months 19 days |  |  |  |
Aggregate Intrinsic Value, Exercised |  |  | (58,000,000) | (308,000,000) |  |
Cash received from exercise of stock options |  | $ 83,000,000 |  |  |  |
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 reserve | $ 331,000,000 | $ 331,000,000 | 12,000,000 | 31,000,000 |  | $ 78,000,000
Insurance Contract, Rights and Obligations |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Participating interest in annuity contract, fair value | $ 42,000,000 | $ 42,000,000 | 46,000,000 |  |  |
Defined Benefit Plan, Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets, percentage | 26.00% | 26.00% |  |  |  |
Corporate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets, percentage | 69.00% | 69.00% |  |  |  |
Real estate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets, percentage | 4.00% | 4.00% |  |  |  |
Defined Benefit Plan, Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocations for plan assets, percentage | 1.00% | 1.00% |  |  |  |
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 | $ 190,000,000 | $ 190,000,000 |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense |  | 152,000,000 | 151,000,000 | 140,000,000 |  |
U.S. | Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlements (loss) gain |  | 0 | 6,000,000 | 37,000,000 |  |
Accumulated benefit obligation | 1,703,000,000 | 1,703,000,000 | 1,414,000,000 |  |  |
U.S. | Pension Benefits | Level 3 | Insurance Contract, Rights and Obligations |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Participating interest in annuity contract, fair value | 42,000,000 | 42,000,000 | 46,000,000 |  |  |
Accumulated benefit obligation | 71,000,000 | 71,000,000 | 84,000,000 |  |  |
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 | 113,000,000 | 113,000,000 | 130,000,000 |  |  |
Int’l. |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected future employer contributions, next fiscal year | 55,000,000 | 55,000,000 |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense |  | 25,000,000 | 23,000,000 | 24,000,000 |  |
Int’l. | Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlements (loss) gain |  | (1,000,000) | 0 | $ 0 |  |
Accumulated benefit obligation | $ 2,392,000,000 | $ 2,392,000,000 | $ 2,642,000,000 |  |  |
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% | 6.50% |  |  |  |
Ultimate health care cost trend rate | 5.00% | 5.00% |  |  |  |
Short term supplemental unemployment benefits | Employee Severance |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Restructuring reserve | $ 323,000,000 | $ 323,000,000 |  |  |  |
Post Sixty Five Retiree | U.S. | Other Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Health care cost trend rate, next fiscal year | 4.60% | 4.60% |  |  |  |
Ultimate health care cost trend rate | 5.00% | 5.00% |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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