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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,130 | $ 1,486 |
Operating (loss) income | (135) | 160 |
Interest expense, net | (35) | (26) |
Investment income from marketable securities | 31 | 0 |
Other income, net | 2 | 3 |
(Loss) income before income tax expense | (137) | 137 |
Depreciation and amortization | 64 | 67 |
Capital expenditures | 48 | 23 |
Total Assets | 4,125 |  | $ 3,905
Operating Segments | Petroleum |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,057 | 1,397 |
Operating (loss) income | (127) | 156 |
Depreciation and amortization | 48 | 49 |
Capital expenditures | 40 | 20 |
Total Assets | 2,961 |  | 3,187
Operating Segments | Nitrogen Fertilizer |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 75 | 92 |
Operating (loss) income | (5) | 9 |
Depreciation and amortization | 16 | 16 |
Capital expenditures | 6 | 3 |
Total Assets | 1,134 |  | 1,138
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | (2) | (3) |
Operating (loss) income | (3) | (5) |
Depreciation and amortization | 0 | 2 |
Capital expenditures | 2 | $ 0 |
Total Assets | $ 30 |  | $ (420)

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