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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following:
(In millions)
June 30, 2017
 
December 31, 2016
NGLs
$
3

 
$
2

Line fill
7

 
9

Spare parts, materials and supplies
52

 
44

Total inventories
$
62

 
$
55