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Inventories | 12 Months Ended
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Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventories | 7. Inventories Inventories consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2020
​ | ​ | (in millions)
Raw materials | ​ | $ | 291 | ​ | $ | 183
Work in process | ​ |  | 83 | ​ |  | 83
Finished goods | ​ |  | 1,104 | ​ |  | 1,314
​ | ​ | $ | 1,478 | ​ | $ | 1,580
​ During the fourth quarter of 2021, our Automotive segment had inventories with a carrying value in excess of net realizable value. As a result, our Automotive segment recorded a write-down of its inventories of $56 million, which is included in cost of goods sold in the consolidated statements of operations for the year ended December 31, 2021. During the first quarter of 2020, our Energy segment had inventories with a carrying value in excess of net realizable value. As a result, our Energy segment recorded a write-down of its inventories of $58 million, which is included in cost of goods sold in the consolidated statements of operations for the year ended December 31, 2020. The write-down represents the difference between the carrying value of inventories accounted for using the first-in-first-out method and selling prices for refined products subsequent to March 31, 2020.

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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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