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Business Segments (Tables) | 6 Months Ended
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Jun. 30, 2019
Segment Reporting [Abstract] |
Operating results and capital expenditures information by segment | The following table summarizes certain operating results and capital expenditures information by segment:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Net sales |  |  |  |  |  |  |
Petroleum | $ | 1,552 |  |  | $ | 1,824 |  |  | $ | 2,949 |  |  | $ | 3,282 |
Nitrogen Fertilizer | 138 |  |  | 93 |  |  | 230 |  |  | 173 |
Other | (3 | ) |  | (3 | ) |  | (6 | ) |  | (4 | )
Total | $ | 1,687 |  |  | $ | 1,914 |  |  | $ | 3,173 |  |  | $ | 3,451 |
Operating Income |  |  |  |  |  |  |
Petroleum | $ | 163 |  |  | $ | 113 |  |  | $ | 319 |  |  | $ | 256 |
Nitrogen Fertilizer | 35 |  |  | — |  |  | 44 |  |  | (4 | )
Other | (6 | ) |  | (6 | ) |  | (11 | ) |  | (8 | )
Total | 192 |  |  | 107 |  |  | 352 |  |  | 244 |
Interest expense, net | (26 | ) |  | (26 | ) |  | (52 | ) |  | (53 | )
Other income, net | 3 |  |  | 2 |  |  | 6 |  |  | 3 |
Income before income taxes | $ | 169 |  |  | $ | 83 |  |  | $ | 306 |  |  | $ | 194 |
Depreciation and amortization |  |  |  |  |  |  |
Petroleum | $ | 52 |  |  | $ | 49 |  |  | $ | 101 |  |  | $ | 97 |
Nitrogen Fertilizer | 25 |  |  | 20 |  |  | 42 |  |  | 37 |
Other | 1 |  |  | 2 |  |  | 2 |  |  | 3 |
Total | $ | 78 |  |  | $ | 71 |  |  | $ | 145 |  |  | $ | 137 |
Capital expenditures (1) |  |  |  |  |  |  |
Petroleum | $ | 17 |  |  | $ | 15 |  |  | $ | 38 |  |  | $ | 29 |
Nitrogen Fertilizer | 2 |  |  | 7 |  |  | 5 |  |  | 11 |
Other | 3 |  |  | 1 |  |  | 3 |  |  | 2 |
Total | $ | 22 |  |  | $ | 23 |  |  | $ | 46 |  |  | $ | 42 |
The following table summarizes total assets by segment:
(in millions) | June 30, 2019 |  | December 31, 2018
Petroleum | $ | 2,833 |  |  | $ | 2,453 |
Nitrogen Fertilizer | 1,190 |  |  | 1,254 |
Other (2) | (193 | ) |  | 293 |
Total Assets | $ | 3,830 |  |  | $ | 4,000 |
(1)Capital expenditures are shown exclusive of turnarounds. (2)Includes elimination of intercompany assets.

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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=115929826&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=115929826&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=108376223&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 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: 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=115929826&loc=d3e8906-108599 + Details
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