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Summary of Significant Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant and Equipment.      
Interest expense, capitalized interest $ 25 $ 16 $ 15
PROPERTY AND EQUIPMENT 9,029 7,814  
Accumulated depreciation (1,289) (1,123)  
Property and equipment, net 7,740 6,691  
Depreciation expense 196 235 216
Approximate reduction in depreciation expense due to depreciable life extensions 60 23  
Incremental reduction in depreciation expense due to depreciable life extensions 37    
Losses on disposition of assets (11) (13)  
Crude oil pipelines and facilities
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT 4,467 4,303  
Average Depreciable Life, minimum (in years) 10    
Average Depreciable Life, Maximum (in years) 70    
Storage and terminal facilities
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT 3,385 2,740  
Average Depreciable Life, minimum (in years) 30    
Average Depreciable Life, Maximum (in years) 70    
Trucking equipment and other
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT 110 106  
Average Depreciable Life, minimum (in years) 3    
Average Depreciable Life, Maximum (in years) 15    
Construction in progress
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT 693 304  
Office property and equipment
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT 99 95  
Average Depreciable Life, minimum (in years) 2    
Average Depreciable Life, Maximum (in years) 50    
Land and other
      
Property, Plant and Equipment.      
PROPERTY AND EQUIPMENT $ 275 $ 266