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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consist of the following:
 
 
December 31,
(In millions)
 
2018
 
2017
NGLs
 
$
9

 
$
4

Line fill
 
9

 
8

Spare parts, materials and supplies
 
59

 
53

Total inventories
 
$
77

 
$
65