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Industry Segments - Schedule of Industry Segments and Eliminations (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($)
Segment Information |  |  |  |
Number of operating segments | segment |  |  | 4 |
Net sales | $ 5,687 | $ 5,216 | $ 14,111 | $ 13,062
Income (loss) from continuing operations before income taxes | (621) | 2,579 | 1,176 | 4,776
Income tax expense | (116) | (710) | (647) | (1,351)
Income (loss) from continuing operations | (737) | 1,869 | 529 | 3,425
Anadarko merger-related costs | 924 | 0 | 974 | 0
Amortization of debt financing fees | 65 |  | 122 |
Operating Segments | Oil and Gas |  |  |  |
Segment Information |  |  |  |
Net sales | 3,821 | 2,889 | 8,890 | 7,874
Income (loss) from continuing operations before income taxes | 221 | 767 | 1,431 | 2,297
Income tax expense | 0 | 0 | 0 | 0
Income (loss) from continuing operations | 221 | 767 | 1,431 | 2,297
Operating Segments | Chemical |  |  |  |
Segment Information |  |  |  |
Net sales | 1,071 | 1,185 | 3,128 | 3,515
Income (loss) from continuing operations before income taxes | 207 | 321 | 680 | 936
Income tax expense | 0 | 0 | 0 | 0
Income (loss) from continuing operations | 207 | 321 | 680 | 936
Operating Segments | Marketing and Other Midstream |  |  |  |
Segment Information |  |  |  |
Net sales | 780 | 1,367 | 2,505 | 2,359
Income (loss) from continuing operations before income taxes | 266 | 1,698 | 876 | 2,127
Income tax expense | 0 | 0 | 0 | 0
Income (loss) from continuing operations | 266 | 1,698 | 876 | 2,127
Operating Segments | WES Midstream |  |  |  |
Segment Information |  |  |  |
Net sales | 383 | 0 | 383 | 0
Income (loss) from continuing operations before income taxes | 134 | 0 | 134 | 0
Income tax expense | 0 | 0 |  |
Income (loss) from continuing operations | 134 | 0 | 134 | 0
Corporate and Eliminations |  |  |  |
Segment Information |  |  |  |
Net sales | (368) | (225) | (795) | (686)
Income (loss) from continuing operations before income taxes | (1,449) | (207) | (1,945) | (584)
Income tax expense | (116) | (710) | (647) | (1,351)
Income (loss) from continuing operations | $ (1,565) | $ (917) | $ (2,592) | $ (1,935)

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