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Employee Benefit Plans (Narrative) (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
investments
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Defined Benefit Plan Disclosure [Line Items]      
Settlements $ 102,000,000 $ 43,000,000 $ 62,000,000
Percent Amortized Of Unamortized Balance For Net Actuarial Gain And Losses 10.00%    
Aggregate Intrinsic Value, exercised $ 68,000,000    
Restricted Stock Units R S U [Member] | Segment Discontinued Operations [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized compensation cost from stock options $ 20,000,000    
Weighted average period of recognition of unvested options, in months 1 year 5 months 15 days    
Longest weighted-average period of recognition of unvested options, in months 2 years    
Weighted-Average Grant-Date Fair Value, Granted | $ / shares $ 46.43 $ 51.46 $ 63.58
Total Fair Value, Issued $ 8,000,000 $ 6,000,000 $ 11,000,000
R S U Stock Settled Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized compensation cost from stock options $ 126,000,000    
Weighted average period of recognition of unvested options, in months 1 year 8 months 1 day    
Longest weighted-average period of recognition of unvested options, in months 2 years 7 months 2 days    
Weighted-Average Grant-Date Fair Value, Granted | $ / shares $ 46.56 $ 57.40 $ 67.77
Total Fair Value, Issued $ 144,000,000 $ 143,000,000 $ 225,000,000
R S U Cash Settled [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized compensation cost from stock options $ 0    
Weighted-Average Grant-Date Fair Value, Granted | $ / shares $ 57.19 $ 41.59 $ 68.20
Total Fair Value, Issued $ 20,000,000   $ 6,000,000
P S U Stock Settled [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized compensation cost from stock options 0    
Weighted-Average Grant-Date Fair Value, Granted | $ / shares   $ 58.61 $ 68.90
Total Fair Value, Issued 18,000,000 $ 13,000,000 $ 25,000,000
P S U Cash Settled Program [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized compensation cost from stock options $ 0    
Weighted-Average Grant-Date Fair Value, Granted | $ / shares $ 46.65 $ 58.61 $ 68.90
Total Fair Value, Issued $ 52,000,000 $ 116,000,000 $ 171,000,000
Twenty Fourteen Omnibus Stock And Performance Incentive Plan Of Conoco Phillips [Member]      
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 [Member] | Employee Stock Option [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average remaining contractual term of outstanding options 3 years 21 days    
Aggregate Intrinsic Value, exercised   23,000,000 39,000,000
Cash received from exercise of stock options $ 198,000,000 15,000,000  
Defined Benefit Plan Debt Security [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Plan Assets Target Allocation Percentage 74.00%    
Defined Benefit Plan Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Plan Assets Target Allocation Percentage 22.00%    
Defined Benefit Plan Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Plan Assets Target Allocation Percentage 3.00%    
Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Plan Assets Target Allocation Percentage 1.00%    
Insurance Contract Rights And Obligations Fair Value Option [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value Of Participating Interest In Annuity Contract $ 83,000,000 94,000,000  
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 24,000,000 31,000,000  
Settlements 0 0 0
Curtailments $ 0 0 0
Other Postretirement Benefit Plans, Defined Benefit [Member] | Twenty Fourteen Omnibus Stock And Performance Incentive Plan Of Conoco Phillips [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Omnibus Stock and Performance Incentive Plan life 10 years    
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 115,000,000    
Defined Contribution Plan Maximum Annual Contributions Per Employee Percent 75.00%    
Number Of Investment Funds In Which Employee Can Contribute | investments 17    
Defined Contribution Plan Employer Matching Contribution Percent 1.00%    
Defined Contribution Plan Employer Matching Contribution Percent Of Match 6.00%    
Employer Matching Discretionary Contribution Percent 6.00%    
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense $ 93,000,000 62,000,000 82,000,000
U.S. [Member] | Defined Contribution Plan Company Retirement Contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan Employer Matching Contribution Percent Of Match 6.00%    
CRC Vesting Period 3 years    
Defined Contribution Plan Vesting Percent 100.00%    
U.S. [Member] | Twenty Fourteen Omnibus Stock And Performance Incentive Plan Of Conoco Phillips [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Share Based Compensation Plan, number of shares authorized | shares 79    
U.S. [Member] | Twenty Fourteen Omnibus Stock And Performance Incentive Plan Of Conoco Phillips [Member] | Incentive Stock Options [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Share Based Compensation Plan, number of shares authorized | shares 40    
U.S. [Member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions $ 451,000,000 99,000,000  
Settlements 102,000,000 44,000,000 62,000,000
Curtailments 12,000,000 0 0
Defined Benefit Plan Accumulated Benefit Obligation 1,793,000,000 2,359,000,000  
U.S. [Member] | Pension Plans Defined Benefit [Member] | Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value Of Participating Interest In Annuity Contract 83,000,000 94,000,000  
Defined Benefit Plan Accumulated Benefit Obligation 123,000,000 139,000,000  
U.S. [Member] | Pension Plans Defined Benefit [Member] | Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan Debt Security [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value Of Participating Interest In Annuity Contract 206,000,000 233,000,000  
Int'l (Pension Benefits) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 80,000,000    
Company contributions in savings plan and predecessor plans except leveraged employee stock ownership plan charged to expense 26,000,000 25,000,000 30,000,000
Int'l (Pension Benefits) [Member] | Pension Plans Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Company contributions 119,000,000 60,000,000  
Settlements 0 (1,000,000) 0
Curtailments 0 0 $ 0
Defined Benefit Plan Accumulated Benefit Obligation $ 3,658,000,000 $ 4,095,000,000