v3.26.1
DERIVATIVES - Schedule of Fair Value Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Marketing Derivatives    
Gross and net fair values of outstanding derivatives    
Netting, asset   $ (328)
Total net fair value, asset   68
Netting and collateral, liability   328
Total net fair value, liability   (32)
Collateral received netted against derivative assets $ 71 29
Collateral paid netted against derivative liabilities   23
Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Gross and net fair values of outstanding derivatives    
Netting and collateral, liability 2,385  
Total net fair value, liability (34)  
Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Gross and net fair values of outstanding derivatives    
Netting, asset (2,385)  
Total net fair value, asset 292  
Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsMiscellaneousNoncurrent    
Gross and net fair values of outstanding derivatives    
Netting, asset (2)  
Total net fair value, asset 0  
Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: oxy:DeferredCreditsAndOtherLiabilitiesNoncurrentOther    
Gross and net fair values of outstanding derivatives    
Netting and collateral, liability 2  
Total net fair value, liability 0  
Crude Collars    
Gross and net fair values of outstanding derivatives    
Netting and collateral, liability 0  
Total net fair value, liability (31)  
Level 1 | Marketing Derivatives    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross   345
Commodity contract derivative liability, gross   (336)
Level 1 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross (2,140)  
Level 1 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 2,261  
Level 1 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsMiscellaneousNoncurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 2  
Level 1 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: oxy:DeferredCreditsAndOtherLiabilitiesNoncurrentOther    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross (2)  
Level 1 | Crude Collars    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross (31)  
Level 2 | Marketing Derivatives    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross   51
Commodity contract derivative liability, gross   (24)
Level 2 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross (279)  
Level 2 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 416  
Level 2 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsMiscellaneousNoncurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 0  
Level 2 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: oxy:DeferredCreditsAndOtherLiabilitiesNoncurrentOther    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross 0  
Level 2 | Crude Collars    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross 0  
Level 3 | Marketing Derivatives    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross   0
Commodity contract derivative liability, gross   $ 0
Level 3 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross 0  
Level 3 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 0  
Level 3 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsMiscellaneousNoncurrent    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative asset, gross 0  
Level 3 | Marketing Derivatives | Location, Statement of Financial Position, Balance [Axis]: oxy:DeferredCreditsAndOtherLiabilitiesNoncurrentOther    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross 0  
Level 3 | Crude Collars    
Gross and net fair values of outstanding derivatives    
Commodity contract derivative liability, gross $ 0