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Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property and Equipment      
Capitalized interest $ 57 $ 48 $ 38
Property and equipment, gross 15,654 14,178  
Accumulated depreciation (2,180) (1,906)  
Property and equipment, net 13,474 12,272  
Depreciation expense 380 319 259
Impairments of long-lived assets   10 $ 20
Pipelines and related facilities      
Property and Equipment      
Property and equipment, gross $ 8,395 7,003  
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 $ 5,012 4,853  
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 $ 392 198  
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 $ 1,217 1,545  
Office property and equipment      
Property and Equipment      
Property and equipment, gross $ 196 156  
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 $ 442 $ 423