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Employee Benefit Plans - Narrative (Details)
$ / shares in Units, shares in Millions
 12 Months Ended
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