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Partners' Capital Preferred unit distribution (Tables)
 12 Months Ended
Dec. 31, 2017
Distributions Made to Limited Partner, by Distribution
Cash distributions paid were as follows: 
 
 
Limited Partners
 
 
Payment Date
 
Per Unit Distribution
 
Total Cash Distribution
 
Distribution to IDR Holders
 
 
(in millions, except per unit amounts)
February 14, 2018
 
$
0.8255

 
$
82

 
$
21

November 14, 2017
 
$
0.8255

 
$
82

 
$
22

August 15, 2017
 
$
0.8255

 
$
82

 
$
21

May 16, 2017
 
$
0.8255

 
$
82

 
$
21

February 16, 2017
 
$
0.8255

 
$
81

 
$
21

November 15, 2016
 
$
0.8255

 
$
79

 
$
20

August 15, 2016
 
$
0.8255

 
$
79

 
$
20

May 16, 2016
 
$
0.8173

 
$
78

 
$
20

February 16, 2016
 
$
0.8013

 
$
70

 
$
17

November 27, 2015
 
$
0.7454

 
$
47

 
$
8

August 28, 2015
 
$
0.6934

 
$
29

 
$
3

May 29, 2015
 
$
0.6450

 
$
23

 
$
1

February 27, 2015
 
$
0.6000

 
$
21

 
$
1
Series A Preferred Unit [Member]  
Distributions Made to Limited Partner, by Distribution
 
 
Series A Preferred Unit Holder
Payment Date
 
Total Cash Distribution
 
 
(in millions)
February 14, 2018
 
$
8

November 14, 2017
 
$
7

August 15, 2017
 
$
8