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Summary of Significant Accounting Policies - Schedule of Inventories (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Inventories, carrying amounts in excess of market value |  |  | $ 59,000,000 | $ 0 | $ 0
Finished goods |  | $ 133,000,000 | 133,000,000 | 177,000,000 |
Raw materials |  | 83,000,000 | 83,000,000 | 112,000,000 |
In-process inventories |  | 16,000,000 | 16,000,000 | 18,000,000 |
Parts and supplies |  | 66,000,000 | 66,000,000 | 66,000,000 |
Total Inventories |  | 298,000,000 | 298,000,000 | 373,000,000 |
Petroleum |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Inventories, carrying amounts in excess of market value | $ 58,000,000 | 0 |  | 0 |
Nitrogen Fertilizer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation of inventories |  | $ 2,000,000 | $ 2,000,000 | $ 5,000,000 |

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