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Industry Segments (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Information |  |  |  |
Number of operating segments | segment |  |  | 3 |
Net sales | $ 5,216 | $ 2,999 | $ 13,062 | $ 9,016
Pre-tax operating profit (loss) | 2,579 | 275 | 4,776 | 1,262
Income taxes | (710) | (85) | (1,351) | (448)
Net income (loss) | 1,869 | 190 | 3,425 | 814
Gain on sale of assets | 926 | 86 | 969 | 598
Qatar |  |  |  |
Segment Information |  |  |  |
Pre-tax impairment charges | 196 |  |  |
South Texas operations | Domestic oil and gas assets |  |  |  |
Segment Information |  |  |  |
Gain on sale of assets |  |  |  | 510
Oil and Gas | Qatar |  |  |  |
Segment Information |  |  |  |
Pre-tax impairment charges | 196 |  | 196 |
Oil and Gas | South Texas operations | Domestic oil and gas assets |  |  |  |
Segment Information |  |  |  |
Gain on sale of assets |  | 510 |  |
Midstream and Marketing | Non-core Midstream assets |  |  |  |
Segment Information |  |  |  |
Pre-tax gain on sale of domestic non-core midstream assets |  |  | 902 |
Operating segments | Oil and Gas |  |  |  |
Segment Information |  |  |  |
Net sales | 2,889 | 1,865 | 7,874 | 5,607
Pre-tax operating profit (loss) | 767 | 220 | 2,297 | 1,067
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 767 | 220 | 2,297 | 1,067
Operating segments | Chemical |  |  |  |
Segment Information |  |  |  |
Net sales | 1,185 | 1,071 | 3,515 | 3,295
Pre-tax operating profit (loss) | 321 | 200 | 936 | 600
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 321 | 200 | 936 | 600
Operating segments | Midstream and Marketing |  |  |  |
Segment Information |  |  |  |
Net sales | 1,367 | 266 | 2,359 | 747
Pre-tax operating profit (loss) | 1,698 | 4 | 2,127 | 76
Income taxes | 0 | 0 | 0 | 0
Net income (loss) | 1,698 | 4 | 2,127 | 76
Operating segments | Midstream and Marketing | Equity investment |  |  |  |
Segment Information |  |  |  |
Non-cash fair value gain |  | 94 |  | 94
Corporate and Eliminations |  |  |  |
Segment Information |  |  |  |
Net sales | (225) | (203) | (686) | (633)
Pre-tax operating profit (loss) | (207) | (149) | (584) | (481)
Income taxes | (710) | (85) | (1,351) | (448)
Net income (loss) | $ (917) | $ (234) | $ (1,935) | $ (929)

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