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INVENTORIES
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES

Materials and supplies are valued at weighted-average cost and are reviewed periodically for obsolescence. Finished goods predominantly comprise oil and natural gas liquids (NGLs), which are valued at the lower of cost and net realizable value. Inventories as of March 31, 2020 and December 31, 2019 consisted of the following:
 
March 31,
 
December 31,
 
2020
 
2019
 
(in millions)
Materials and supplies(a)
$
58

 
$
64

Finished goods
2

 
3

    Total
$
60

 
$
67

(a)
Based on our assessment of the utility of our inventory at March 31, 2020, we recorded a $7 million write down to our materials and supplies, which is included in asset impairments on our condensed consolidated statements of operations.