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Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,914 | $ 1,434 | $ 3,451 | $ 2,942 |
Operating income (loss) | 111 | 1 | 201 | 69 |
Interest expense, net | (27) | (27) | (53) | (54) |
Gain on derivatives, net | 10 | 0 | 70 | 12 |
Other income, net | 2 | 0 | 3 | 0 |
Income (loss) before income tax expense | 96 | (26) | 221 | 27 |
Depreciation and amortization | 55 | 54 | 108 | 105 |
Capital expenditures | 22 | 33 | 42 | 58 |
Total assets | 3,850 |  | 3,850 |  | $ 3,807
Operating Segments | Petroleum |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,824 | 1,338 | 3,282 | 2,762 |
Operating income (loss) | 117 | (7) | 214 | 59 |
Depreciation and amortization | 33 | 32 | 67 | 66 |
Capital expenditures | 16 | 28 | 32 | 48 |
Total assets | 2,366 |  | 2,366 |  | 2,270
Operating Segments | Nitrogen Fertilizer |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 93 | 98 | 173 | 183 |
Operating income (loss) | 0 | 12 | (4) | 18 |
Depreciation and amortization | 20 | 20 | 37 | 35 |
Capital expenditures | 6 | 4 | 9 | 9 |
Total assets | 1,200 |  | 1,200 |  | 1,234
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (3) | (2) | (4) | (3) |
Operating income (loss) | (6) | (4) | (9) | (8) |
Depreciation and amortization | 2 | 2 | 4 | 4 |
Capital expenditures | 0 | $ 1 | 1 | $ 1 |
Total assets | $ 284 |  | $ 284 |  | $ 303

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