v3.5.0.2
Related-Party Transactions, Summary of Affiliate Transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 20, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Event              
Imbalance settlement gains         $ (8) $ (17) $ (8)
Revenues [1]         615 497 273
Operating and maintenance expenses         122 100 85
Imbalance settlement gains and reimbursements from Tesoro [2]         (42) (43) (12)
General and administrative expenses         71 39 20
Reimbursements from Tesoro         34 26 4
Quarterly cash distributions, including IDRs         $ 148 $ 87 $ 44
Quarterly cash distribution              
Subsequent Event              
Cash distributions paid per unit $ 0.7800 $ 0.875 $ 0.842 $ 0.810      
Cash distribution to Tesoro $ 50            
Date of distribution Feb. 12, 2016 Nov. 14, 2016 Aug. 12, 2016 May 13, 2016      
[1] All periods include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.
[2] Includes net imbalance settlement gains of $8 million, $17 million and $8 million in the years ended December 31, 2015, 2014 and 2013, respectively. Also includes reimbursements primarily related to pressure testing and repairs and maintenance costs pursuant to the Amended Omnibus Agreement and the Carson Assets Indemnity Agreement of $34 million, $26 million and $4 million in the years ended December 31, 2015, 2014 and 2013, respectively.