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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Goodwill Rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 12, 2016
Jun. 22, 2016
Dec. 16, 2015
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]                
Goodwill           $ 1,123 $ 1,149  
Impairment in goodwill       $ (320) $ (642)      
Goodwill         1,050 1,050 1,123 $ 1,149
Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwill           687 724  
Goodwill         770 770 687 724
Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwill           436 425  
Goodwill         $ 280 280 436 425
Aloha Petroleum Ltd [Member]                
Goodwill [Roll Forward]                
Goodwil adjustments related to acquisition               (49)
Aloha Petroleum Ltd [Member] | Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwil adjustments related to acquisition               (54)
Aloha Petroleum Ltd [Member] | Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwil adjustments related to acquisition               5
Alta East, Inc [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition     $ 19         17
Goodwil adjustments related to acquisition           2    
Alta East, Inc [Member] | Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition               17
Goodwil adjustments related to acquisition           2    
Alta East, Inc [Member] | Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition               0
Goodwil adjustments related to acquisition           0    
Kolkhorst Petroleum Inc [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition   $ 19       3    
Kolkhorst Petroleum Inc [Member] | Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition           3    
Kolkhorst Petroleum Inc [Member] | Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition           0    
Valentine Stores Inc [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition   $ 42            
Emerge Energy Services L P [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition           78    
Emerge Energy Services L P [Member] | Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition           78    
Emerge Energy Services L P [Member] | Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition           $ 0    
Denny Oil Company [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition $ 1              
Other Acquisition [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition             $ 13 6
Other Acquisition [Member] | Wholesale Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition               0
Other Acquisition [Member] | Retail Segment [Member]                
Goodwill [Roll Forward]                
Goodwill related to acquisition               $ 6