v3.5.0.2
Equity, Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
May 13, 2016
Apr. 20, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Distribution Made to Member or Limited Partner            
Declaration date       Oct. 18, 2016    
Quarterly Distribution Per Unit         $ 0.78 $ 0.8420
Total Cash Distribution including general partner IDRs       $ 108 $ 98 $ 123
Date of Distribution         Feb. 12, 2016 Aug. 12, 2016
Unitholders Record Date       May 02, 2016 Feb. 02, 2016 Aug. 02, 2016
Subsequent Event            
Distribution Made to Member or Limited Partner            
Declaration date   Apr. 20, 2016        
Quarterly Distribution Per Unit   $ 0.81 $ 0.8750 [1]      
Total Cash Distribution including general partner IDRs [1]     $ 131      
Date of Distribution May 13, 2016   Nov. 14, 2016 [1]      
Unitholders Record Date [1]     Nov. 04, 2016      
Rockies Natural Gas Business Acquisition            
Distribution Made to Member or Limited Partner            
General partner distribution amount forfeited       $ 3    
[1] This distribution was declared on October 18, 2016 and will be paid on the date of distribution.