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Property and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property and Equipment      
Interest expense, capitalized interest $ 38 $ 36 $ 25
Property and equipment, gross 12,473 11,142  
Accumulated depreciation (1,654) (1,499)  
Property and equipment, net 10,819 9,643  
Depreciation expense 259 222 196
Incremental reduction in depreciation expense due to depreciable life extensions   13  
Impairment charges - predominantly related to assets taken out of service 20   5
Impairments of long-lived assets primarily related to Pier 400 terminal project   168  
Pipelines and related facilities
     
Property and Equipment      
Property and equipment, gross 6,113 5,305  
Pipelines and related facilities | Minimum
     
Property and Equipment      
Estimated Useful Lives 10 years    
Pipelines and related facilities | Maximum
     
Property and Equipment      
Estimated Useful Lives 70 years    
Storage, terminal and rail facilities
     
Property and Equipment      
Property and equipment, gross 4,704 4,354  
Storage, terminal and rail facilities | Minimum
     
Property and Equipment      
Estimated Useful Lives 30 years    
Storage, terminal and rail facilities | Maximum
     
Property and Equipment      
Estimated Useful Lives 70 years    
Trucking equipment and other
     
Property and Equipment      
Property and equipment, gross 150 136  
Trucking equipment and other | Minimum
     
Property and Equipment      
Estimated Useful Lives 3 years    
Trucking equipment and other | Maximum
     
Property and Equipment      
Estimated Useful Lives 15 years    
Construction in progress
     
Property and Equipment      
Property and equipment, gross 1,008 910  
Office property and equipment
     
Property and Equipment      
Property and equipment, gross 125 111  
Office property and equipment | Minimum
     
Property and Equipment      
Estimated Useful Lives 2 years    
Office property and equipment | Maximum
     
Property and Equipment      
Estimated Useful Lives 50 years    
Land and other
     
Property and Equipment      
Property and equipment, gross $ 373 $ 326