v3.8.0.1
Related-Party Transactions Related-Party Transactions, Summary of Transactions Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Nov. 14, 2017
Oct. 18, 2017
Sep. 30, 2017
Jun. 30, 2017
 [4]
Mar. 31, 2017
 [4]
Dec. 31, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cash Dividends Paid to Parent Company               $ 223  
Revenue from Related Parties [1]               934 $ 521 [2]
Related Party Transaction, Expenses from Transactions with Related Party [3]               132 107
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party               $ 62 52
Concentration Risk, Percentage             58.00% 44.00%  
Cost of Reimbursable Expense               $ 12 12
Distribution Made to Limited Partner, Distributions Declared, Per Unit     $ 0.9852 [4],[5] $ 0.9710 $ 0.9400 $ 0.9100      
Distribution Made to Limited Partner, Distribution Date     Nov. 14, 2017 [4],[5] Aug. 14, 2017 May 15, 2017 Feb. 14, 2017      
Partner to Andeavor [Member] | Omnibus Agreement                  
Payment for Administrative Fees               11  
Andeavor to Partner | Secondment and Logistics Services Agreement                  
Long-term Purchase Commitment, Amount               16 $ 7
Western Refining Logistics                  
Cash Dividends Paid to Parent Company               $ 19  
Distribution Made to Limited Partner, Distributions Declared, Per Unit [6],[7]     $ 0.4675            
Subsequent Event                  
Distribution Made to Limited Partner, Declaration Date   Oct. 18, 2017              
Subsequent Event | Western Refining Logistics                  
Distribution Made to Limited Partner, Declaration Date   Jul. 25, 2017              
Distribution Made to Limited Partner, Distribution Date Aug. 18, 2017                
[1] Andeavor accounted for 44% and 58% of our total revenues for the nine months ended September 30, 2017 and 2016, respectively
[2] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3] Net of reimbursements from Andeavor pursuant to the Amended Omnibus Agreement, the Carson Assets Indemnity Agreement and other affiliate agreements of $12 million for the nine months ended September 30, 2017 and 2016, respectively.
[4] This distribution is net of $12.5 million waived by TLGP on either IDRs or common units for each of the three months ended September 30, 2017, June 30, 2017, and March 31, 2017.
[5] This distribution was declared on October 18, 2017 and will be paid on the date of distribution.
[6] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[7] Total general partner earnings and limited partner earnings on common units for the nine months ended September 30, 2017 differ from the amounts recognized in equity as of September 30, 2017. The table above reconciles general and limited earnings calculated using the ownership structure in place after the WNRL Merger and IDR/GP Transaction to amounts recorded to equity as of September 30, 2017 by showing the earnings that were allocated to the general partner’s capital account based on the ownership structure in place for three months ended September 30, 2017.