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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Schedule of segment information | The following tables summarize operating results, capital expenditures, and total asset information by segment:
| Year Ended December 31,
(in millions) | 2020 |  | 2019 |  | 2018
Net sales |  |  |  |  |
Petroleum | $ | 3,586 |  |  | $ | 5,968 |  |  | $ | 6,780 |
Nitrogen Fertilizer | 350 |  |  | 404 |  |  | 351 |
Other | (6) |  |  | (8) |  |  | (7) |
Total | $ | 3,930 |  |  | $ | 6,364 |  |  | $ | 7,124 |
Operating (loss) income |  |  |  |  |
Petroleum | $ | (281) |  |  | $ | 574 |  |  | $ | 544 |
Nitrogen Fertilizer | (35) |  |  | 27 |  |  | 6 |
Other | (17) |  |  | (21) |  |  | (18) |
Total | (333) |  |  | 580 |  |  | 532 |
Interest expense, net | (130) |  |  | (102) |  |  | (102) |
Investment income from marketable securities | 41 |  |  | — |  |  | — |
Other income, net | 7 |  |  | 13 |  |  | 15 |
(Loss) income before income taxes | $ | (415) |  |  | $ | 491 |  |  | $ | 445 |
Depreciation and amortization |  |  |  |  |
Petroleum | $ | 202 |  |  | $ | 202 |  |  | $ | 196 |
Nitrogen Fertilizer | 76 |  |  | 80 |  |  | 72 |
Other | — |  |  | 5 |  |  | 6 |
Total | $ | 278 |  |  | $ | 287 |  |  | $ | 274 |
Capital expenditures (1) |  |  |  |  |
Petroleum | $ | 90 |  |  | $ | 89 |  |  | $ | 89 |
Nitrogen fertilizer | 16 |  |  | 20 |  |  | 19 |
Other | 15 |  |  | 5 |  |  | 3 |
Total | $ | 121 |  |  | $ | 114 |  |  | $ | 111 |
The following table summarizes total assets by segment:
| December 31,
(in millions) | 2020 |  | 2019 |  |
Petroleum | $ | 2,991 |  |  | $ | 3,187 |  |  |
Nitrogen Fertilizer | 1,033 |  |  | 1,138 |  |  |
Other (2) | (46) |  |  | (420) |  |  |
Total assets | $ | 3,978 |  |  | $ | 3,905 |  |  |
(1)Capital expenditures are shown exclusive of capitalized turnaround expenditures. (2)Includes elimination of intercompany assets and net cash proceeds from the Notes issued during the year ended December 31, 2020.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details
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