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Employee Benefit Plans - Narrative (Details) $ / shares in Units, shares in Millions | 12 Months Ended |
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Dec. 31, 2023 USD ($) investment_option installment $ / shares shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2013 | Dec. 31, 2020 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 | $ 102,000,000 |  |
Percent amortized for net actuarial gains and losses | 10.00% | 10.00% | 10.00% |  |
Aggregate Intrinsic Value, Exercised | $ (58,000,000) |  |  |  |
Minimum period required for award to not be subject to forfeiture | 6 months |  |  |  |
Share-based Payment Arrangement, Option |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Vesting period | 6 months |  |  |  |
Expiration period | 10 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Restricted Stock Units (RSUs) | Discontinued Operations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average period of recognition of unvested options | 3 days |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 115.88 | $ 96.20 | $ 46.43 |  |
Total fair value, issued | $ 46,000,000 | $ 40,000,000 | $ 8,000,000 |  |
RSU Stock Settled |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unrecognized compensation cost from stock options | $ 166,000,000 |  |  |  |
Weighted average period of recognition of unvested options | 1 year 8 months 12 days |  |  |  |
Longest weighted-average period of recognition of unvested options | 2 years 6 months 29 days |  |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 110.91 | $ 90.57 | $ 46.56 |  |
Total fair value, issued | $ 284,000,000 | $ 193,000,000 | $ 144,000,000 |  |
Vesting period | 6 months |  |  |  |
RSU Cash Settled |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total fair value, issued |  | $ 21,000,000 | $ 20,000,000 |  |
Vesting period | 6 months |  |  |  |
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 | $ 112.50 | $ 91.58 | $ 46.65 |  |
Total fair value, issued | $ 111,000,000 | $ 88,000,000 | $ 52,000,000 |  |
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 | $ 112.50 | $ 91.58 |  |  |
Total fair value, issued | $ 29,000,000 | $ 21,000,000 | 18,000,000 |  |
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 11 months 23 days |  |  |  |
Aggregate Intrinsic Value, Exercised |  | (308,000,000) | (68,000,000) |  |
Cash received from exercise of stock options | $ 66,000,000 |  |  |  |
Tax benefit from exercise of options | $ 12,000,000 |  |  |  |
Omnibus Plan, General And Executive RSU Program | Restricted Stock Units (RSUs) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of vesting installments | installment | 1 |  |  |  |
Omnibus Plan, Variable Long-Term Incentive Retention Program | Restricted Stock Units (RSUs) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of vesting installments | installment | 3 |  |  |  |
Employee Severance |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Restructuring reserve | $ 12,000,000 | 31,000,000 | 78,000,000 |  | $ 24,000,000
Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | $ 46,000,000 | 55,000,000 |  |  |
Defined Benefit Plan, Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocations for plan assets, percentage | 24.00% |  |  |  |
Corporate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocations for plan assets, percentage | 72.00% |  |  |  |
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 | $ 125,000,000 |  |  |  |
Maximum annual contributions per employee, percentage | 75.00% |  |  |  |
Number of investment options | investment_option | 17 |  |  |  |
Employer matching contribution, percent of employee's gross pay | 1.00% |  |  |  |
Employer matching contribution, percent of match | 6.00% |  |  |  |
Company discretionary cash contribution, percentage | 6.00% |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense | $ 151,000,000 | 140,000,000 | 93,000,000 |  |
U.S. | Defined Contribution Plan Company Retirement Contribution |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching contribution, percent of match | 6.00% |  |  |  |
Defined contribution plan, employers vesting period | 3 years |  |  |  |
Defined contribution plan, vesting percent | 100.00% |  |  |  |
U.S. | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlements (loss) gain | $ 6,000,000 | 37,000,000 | 102,000,000 |  |
Accumulated benefit obligation | 1,414,000,000 | 1,384,000,000 |  |  |
U.S. | Pension Benefits | Level 3 Inputs | Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | 46,000,000 | 55,000,000 |  |  |
Accumulated benefit obligation | 84,000,000 | 89,000,000 |  |  |
U.S. | Pension Benefits | Corporate | Level 3 Inputs | Insurance Contract, Rights and Obligations |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participating interest in annuity contract, fair value | 130,000,000 | 144,000,000 |  |  |
Int’l. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected future employer contributions, next fiscal year | 75,000,000 |  |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense | 23,000,000 | 24,000,000 | 26,000,000 |  |
Int’l. | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlements (loss) gain | 0 | 0 | $ 0 |  |
Accumulated benefit obligation | $ 2,642,000,000 | $ 2,542,000,000 |  |  |
COP Pre Sixty Five Retiree | U.S. | Other Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Health care cost trend rate, next fiscal year | 7.00% |  |  |  |
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 | 4.50% |  |  |  |
Ultimate health care cost trend rate | 5.00% |  |  |  |
Short term supplemental unemployment benefits | Employee Severance |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Restructuring reserve | $ 3,000,000 |  |  |  |

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