v3.7.0.1
Equity, Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Aug. 14, 2017
Aug. 04, 2017
Jul. 19, 2017
Jun. 30, 2017
 [1],[2]
Mar. 31, 2017
Dec. 31, 2016
Distribution Made to Member or Limited Partner            
Quarterly Distribution Per Unit       $ 0.971 $ 0.94 [1] $ 0.91
Total Cash Distribution including general partner IDRs (in millions)       $ 147 $ 140 [1] $ 140
Date of Distribution         May 15, 2017 Feb. 14, 2017
Unitholders Record Date         May 05, 2017 Feb. 03, 2017
Subsequent Event            
Distribution Made to Member or Limited Partner            
Date of Distribution Aug. 14, 2017          
Unitholders Record Date   Aug. 04, 2017        
Distribution Made to Limited Partner, Declaration Date     Jul. 19, 2017      
[1] This distribution is net of $12.5 million of IDRs waived by TLGP for each of the three months ended June 30, 2017 and March 31, 2017.
[2] This distribution was declared on July 19, 2017 and will be paid on the date of distribution.