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Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended
Nov. 22, 2024
Jul. 31, 2025
Nov. 30, 2024
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2025
Business Combination [Line Items]                  
Transaction-related costs         $ 2     $ 42 $ 587
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets | Lower 48                  
Business Combination [Line Items]                  
Proceeds from sale of business             $ 581    
Before-tax gain (loss) on disposition             64    
Gain (loss) on disposal, net of tax             $ 49    
Net carrying value           $ 517      
Disposal group including discontinued operation, net carrying value, PP&E           553      
Disposal group, including discontinued operation, liabilities           36      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ursa And Europa Fields, Ursa Oil Pipeline Company LLC, And Shell Pipeline Company LP | Lower 48                  
Business Combination [Line Items]                  
Proceeds from sale of business           718      
Before-tax gain (loss) on disposition           274      
Gain (loss) on disposal, net of tax           $ 266      
Net carrying value         444     444 444
Disposal group including discontinued operation, net carrying value, assets         536     536 536
Disposal group including discontinued operation, net carrying value, PP&E         522     522 522
Disposal group, including discontinued operation, liabilities         92     92 92
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lower 48 Assets In Anadarko Basin                  
Business Combination [Line Items]                  
Proceeds from sale of business   $ 1,300              
Disposal group including discontinued operation, net carrying value, assets         $ 1,200     $ 1,200 $ 1,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Lower 48 Assets In Anadarko Basin | Forecast | Subsequent Event                  
Business Combination [Line Items]                  
Proceeds from sale of business       $ 500          
Marathon Oil Corporation                  
Business Combination [Line Items]                  
Total consideration $ 16,500   $ 16,507            
Common stock, number of Marathon Oil shares received for each share of ConocoPhillips common stock 0.255                
Proved properties $ 13,000                
Unproved properties 11,000                
Marathon Oil Corporation | Lower 48                  
Business Combination [Line Items]                  
Proved properties 12,000                
Marathon Oil Corporation | Equatorial Guinea                  
Business Combination [Line Items]                  
Proved properties $ 1,000