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Acquisitions and Divestitures Terminals Asset Sale (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Terminals
Dec. 31, 2016
USD ($)
Terminals
Dec. 31, 2016
USD ($)
Terminals
Dec. 31, 2015
USD ($)
Long Lived Assets Held-for-sale [Line Items]        
Assets held for sale   $ 78 $ 78 $ 19
Terminal Asset Sale [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Number of terminals | Terminals 20      
Proceeds from Sale of Property, Plant, and Equipment $ 100      
Gain (loss) on impairments and divestitures, net     (81)  
Goodwill, Period Increase (Decrease)     $ 7  
Number of Terminals Sales Transaction Closed | Terminals   7    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Terminal Asset Sale [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Proceeds from Sale of Property, Plant, and Equipment   $ 37    
Number of Terminals Sales Transaction Closed | Terminals   7    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Terminal Asset Sale [Member]        
Long Lived Assets Held-for-sale [Line Items]        
Number of terminals | Terminals   13 13  
Assets held for sale   $ 61 $ 61