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Employee Benefit Plans - Narrative (Details) $ / shares in Units, shares in Millions | 12 Months Ended |
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Dec. 31, 2022 USD ($) investment_option $ / shares shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 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) | $ 37,000,000 | $ 102,000,000 | $ 43,000,000 |
Percent amortized for net actuarial gains and losses | 10.00% |  |  |
Aggregate intrinsic value, exercised | $ 308,000,000 |  |  |
Restricted Stock Units (RSUs) | Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized compensation cost from stock options | $ 10,000,000 |  |  |
Weighted average period of recognition of unvested options | 1 year |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 96.20 | $ 46.43 | $ 51.46 |
Total fair value, issued | $ 40,000,000 | $ 8,000,000 | $ 6,000,000 |
RSU Stock Settled |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized compensation cost from stock options | $ 135,000,000 |  |  |
Weighted average period of recognition of unvested options | 1 year 8 months 1 day |  |  |
Longest weighted-average period of recognition of unvested options | 2 years 8 months 1 day |  |  |
Weighted-average grant date fair value, granted (in dollars per share) | $ / shares | $ 90.57 | $ 46.56 | $ 57.40 |
Total fair value, issued | $ 193,000,000 | $ 144,000,000 | $ 143,000,000 |
RSU Cash 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 | $ 85.37 | $ 57.19 | $ 41.59 |
Total fair value, issued | $ 21,000,000 | $ 20,000,000 |  |
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 | $ 91.58 | $ 46.65 | $ 58.61 |
Total fair value, issued | $ 88,000,000 | $ 52,000,000 | $ 116,000,000 |
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 | $ 91.58 |  | $ 58.61 |
Total fair value, issued | $ 21,000,000 | 18,000,000 | $ 13,000,000 |
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 | 79 |  |  |
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 | 2 years 6 months 25 days |  |  |
Aggregate intrinsic value, exercised |  | 68,000,000 | 23,000,000 |
Cash received from exercise of stock options | $ 438,000,000 | 59,000,000 |  |
Employee Severance |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Restructuring reserve | 31,000,000 | 78,000,000 | 24,000,000 | $ 23,000,000
Insurance Contract, Rights and Obligations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Participating interest in annuity contract, fair value | $ 55,000,000 | 83,000,000 |  |
Defined Benefit Plan, Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocations for plan assets, percentage | 25.00% |  |  |
Corporate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocations for plan assets, percentage | 71.00% |  |  |
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 |  |  |
United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future employer contributions, next fiscal year | $ 90,000,000 |  |  |
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 | $ 140,000,000 | 93,000,000 | 62,000,000 |
United States | 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% |  |  |
United States | 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 | 79 |  |  |
United States | Twenty Fourteen Omnibus Stock and Performance Incentive Plan Of Conoco Phillips | Incentive Stock Options |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Share based compensation plan, number of shares authorized | shares | 40 |  |  |
United States | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlements loss (gain) | $ 37,000,000 | 102,000,000 | 44,000,000 |
Accumulated benefit obligation | 1,384,000,000 | 1,793,000,000 |  |
United States | Pension Benefits | Level 3 Inputs | Insurance Contract, Rights and Obligations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Participating interest in annuity contract, fair value | 55,000,000 | 83,000,000 |  |
Accumulated benefit obligation | 89,000,000 | 123,000,000 |  |
United States | Pension Benefits | Corporate | Level 3 Inputs | Insurance Contract, Rights and Obligations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Participating interest in annuity contract, fair value | 144,000,000 | 206,000,000 |  |
Int’l. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future employer contributions, next fiscal year | 45,000,000 |  |  |
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense | 24,000,000 | 26,000,000 | 25,000,000 |
Int’l. | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Settlements loss (gain) | 0 | 0 | $ (1,000,000) |
Accumulated benefit obligation | $ 2,542,000,000 | $ 3,658,000,000 |  |
COP Pre Sixty Five Retiree | United States | 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 | United States | 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 | $ 19,000,000 |  |  |

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