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Inventories (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories were as follows: 
 
December 31, 
 2015
 
December 31, 
 2014
 
(Millions)
Natural gas
$
29

 
$
36

NGLs
14

 
27

Total inventories
$
43

 
$
63