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Property, Plant and Equipment - Schedule of Historical Costs of our Property, Plant and Equipment and Related Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 75,472 $ 71,203
Less accumulated depreciation 24,338 22,330
Subtotal property, plant and equipment, net 51,134 48,873
Capitalized major maintenance costs for reaction-based plants, net of accumulated amortization 225 189
Property, plant and equipment, net 51,359 49,062
Plants, pipelines and facilities    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 66,498 60,716
Plants, pipelines and facilities | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 3 years  
Plants, pipelines and facilities | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 45 years  
Underground and other storage facilities    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 4,871 4,704
Underground and other storage facilities | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 5 years  
Underground and other storage facilities | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 40 years  
Transportation equipment    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 294 272
Transportation equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 3 years  
Transportation equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 10 years  
Marine vessels    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 970 949
Marine vessels | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 15 years  
Marine vessels | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 30 years  
Land    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 439 424
Construction in progress    
Property, Plant and Equipment, Net, by Type [Abstract]    
Subtotal $ 2,400 $ 4,138
Distillation-based and reaction-based plants | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 20 years  
Distillation-based and reaction-based plants | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 35 years  
Pipelines and related equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 5 years  
Pipelines and related equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 45 years  
Terminal facilities | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 10 years  
Terminal facilities | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 35 years  
Buildings | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 20 years  
Buildings | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 40 years  
Office furniture and equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 3 years  
Office furniture and equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 20 years  
Laboratory and shop equipment | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 5 years  
Laboratory and shop equipment | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 35 years  
Underground storage facilities | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 5 years  
Underground storage facilities | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 35 years  
Storage tanks | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 10 years  
Storage tanks | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 40 years  
Water wells | Minimum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 5 years  
Water wells | Maximum    
Property, Plant and Equipment, Net, by Type [Abstract]    
Estimated Useful Life in Years 35 years  
Capitalized Major Maintenance | Weighted Average    
Property, Plant and Equipment, Net, by Type [Abstract]    
Expected remaining amortization period 2 years 6 months