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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories

Inventories consist of the following:
(In millions)
March 31, 2018
 
December 31, 2017
NGLs
$
2

 
$
4

Line fill
7

 
8

Spare parts, materials and supplies
55

 
53

Total inventories
$
64

 
$
65