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