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Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Oct. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Oct. 15, 2014
Western Refining Wholesale, LLC [Member]        
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Gross $ 320      
Payments for (Proceeds from) Businesses and Interest in Affiliates $ 51      
Intercompany Agreements, Description 10      
Common Units [Member] | Western Refining Wholesale, LLC [Member]        
Business Acquisition [Line Items]        
Limited Partners' Capital Account, Units Issued       1,160,092
Revolving Credit Facility [Member] | Revolving Credit Agreement - WNRL [Member] | Western Refining Wholesale, LLC [Member]        
Business Acquisition [Line Items]        
Long-term Line of Credit       $ 269
Western Refining, Inc. [Member]        
Business Acquisition [Line Items]        
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest   66.10% 66.20%