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INVENTORIES | 3 Months Ended
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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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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