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Industry Segments (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Information |  |  |  |
Number of operating segments | segment |  |  | 3 |
Net sales | $ 4,420 | $ 4,083 | $ 8,424 | $ 7,846
Pre-tax operating profit (loss) | 941 | 1,150 | 1,797 | 2,197
Income taxes | (306) | (302) | (531) | (641)
Net income (loss) | 635 | 848 | 1,266 | 1,556
Anadarko transaction-related costs | 50 | 0 | 50 | 0
Operating segments | Oil and Gas |  |  |  |
Segment Information |  |  |  |
Net sales | 2,718 | 2,531 | 5,069 | 4,985
Pre-tax operating profit (loss) | 726 | 780 | 1,210 | 1,530
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 726 | 780 | 1,210 | 1,530
Operating segments | Chemical |  |  |  |
Segment Information |  |  |  |
Net sales | 998 | 1,176 | 2,057 | 2,330
Pre-tax operating profit (loss) | 208 | 317 | 473 | 615
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 208 | 317 | 473 | 615
Operating segments | Midstream and Marketing |  |  |  |
Segment Information |  |  |  |
Net sales | 909 | 603 | 1,725 | 992
Pre-tax operating profit (loss) | 331 | 250 | 610 | 429
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 331 | 250 | 610 | 429
Corporate and Eliminations |  |  |  |
Segment Information |  |  |  |
Net sales | (205) | (227) | (427) | (461)
Pre-tax operating profit (loss) | (324) | (197) | (496) | (377)
Income taxes | (306) | (302) | (531) | (641)
Net income (loss) | $ (630) | $ (499) | (1,027) | $ (1,018)
Expenses |  |  | 107 |
Anadarko transaction-related costs |  |  | 50 |
Amortized debt financing fees |  |  | $ 57 |

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