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Mergers and Acquisitions - Susser Acquisition (Narrative) (Details)
$ in Millions
7 Months Ended 12 Months Ended
Aug. 19, 2015
Jul. 31, 2015
USD ($)
shares
Jul. 31, 2015
USD ($)
Dec. 31, 2016
shares
Dec. 31, 2015
USD ($)
Jul. 30, 2015
shares
Business Acquisition [Line Items]            
Equity units issued (in shares)       5,710,922    
Susser [Member]            
Business Acquisition [Line Items]            
Percentage of membership interest acquired   100.00% 100.00%      
Payments to acquire business | $   $ 967        
Pro forma revenues | $     $ 2,600   $ 742  
Pro forma net income (loss) | $     $ 18   $ (15)  
Class B Units [Member] | Susser [Member]            
Business Acquisition [Line Items]            
Equity units issued (in shares)   21,978,980        
Conversion ratio 1          
Common Units [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   79,308        
Common Units [Member] | Susser [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   79,308        
Limited partner interest, units issued (in shares)           79,308
Common Units [Member] | Class A Units [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   79,308        
Common Units [Member] | Class A Units [Member] | Susser [Member]            
Business Acquisition [Line Items]            
Partners' capital account, units issued upon acquisition (in shares)   79,308        
Subordinated Units [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   10,939,436        
Subordinated Units [Member] | Susser [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   10,939,436        
Limited partner interest, units issued (in shares)           10,939,436
Subordinated Units [Member] | Class A Units [Member]            
Business Acquisition [Line Items]            
Partners' capital account, converted units (in shares)   10,939,436        
Subordinated Units [Member] | Class A Units [Member] | Susser [Member]            
Business Acquisition [Line Items]            
Partners' capital account, units issued upon acquisition (in shares)   10,939,436