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INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS - RESULTS OF OPERATIONS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Information |  |  |
Net sales | $ 17,824 | $ 12,508 | $ 10,090
Pretax operating profit (loss) | 5,608 | 1,328 | (1,664)
Income taxes | (1,477) | (17) | 662
Discontinued operations, net | 0 | 0 | 428
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 4,131 | 1,311 | (574)
Investment in unconsolidated entities | 1,680 | 1,515 | 1,401
Property, plant and equipment additions, net | 5,020 | 3,651 | 2,780
Depreciation, depletion and amortization | 3,977 | 4,002 | 4,268
Total assets | 43,854 | 42,026 | 43,109
Tax effect of pre-tax adjustments | 198 | 392 | 424
Qatar ISND and ISSD |  |  |
Segment Information |  |  |
Impairments of assets | 416 |  |
Total Foreign |  |  |
Segment Information |  |  |
Net sales | $ 5,403 | $ 4,423 | $ 3,800
Oil and Gas | Product Concentration | Oil |  |  |
Segment Information |  |  |
Percentage sales | 90.00% | 90.00% | 90.00%
Chemical | Product Concentration | Basic Chemicals |  |  |
Segment Information |  |  |
Percentage sales | 59.00% | 57.00% | 57.00%
Chemical | Product Concentration | Vinyls |  |  |
Segment Information |  |  |
Percentage sales | 41.00% | 42.00% | 40.00%
Chemical | Product Concentration | Other Chemicals |  |  |
Segment Information |  |  |
Percentage sales | 0.00% | 1.00% | 3.00%
Midstream and Marketing |  |  |
Segment Information |  |  |
Impairments of assets | $ 100 |  |
Midstream and Marketing | Non Core Midstream Assets |  |  |
Segment Information |  |  |
Pre-tax net gain from divestiture | $ 907 |  |
Midstream and Marketing | Product Concentration | Gas Processing |  |  |
Segment Information |  |  |
Percentage sales | 62.00% | (11.00%) | (52.00%)
Midstream and Marketing | Product Concentration | Gas Plants |  |  |
Segment Information |  |  |
Percentage sales | 27.00% | 69.00% | 92.00%
Midstream and Marketing | Product Concentration | Power |  |  |
Segment Information |  |  |
Percentage sales | 10.00% | 29.00% | 44.00%
Midstream and Marketing | Product Concentration | Marketing, Transportation and other |  |  |
Segment Information |  |  |
Percentage sales | 1.00% | 13.00% | 16.00%
Operating segments | Oil and Gas |  |  |
Segment Information |  |  |
Net sales | $ 10,441 | $ 7,870 | $ 6,377
Pretax operating profit (loss) | 2,442 | 1,111 | (636)
Income taxes | 0 | 0 | 0
Discontinued operations, net |  |  | 0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 2,442 | 1,111 | (636)
Investment in unconsolidated entities | 0 | 0 | 0
Property, plant and equipment additions, net | 4,443 | 2,968 | 1,998
Depreciation, depletion and amortization | 3,254 | 3,269 | 3,575
Total assets | 24,874 | 23,595 | 24,130
Pre-tax gain on sale of properties |  |  | 24
Operating segments | Oil and Gas | South Texas and non-core acreage in the Permian basin |  |  |
Segment Information |  |  |
Pre-tax gain on sale of properties |  | 655 |
Operating segments | Oil and Gas | Non-core Permian acreage |  |  |
Segment Information |  |  |
Impairment charges |  | 397 |
Operating segments | Oil and Gas | Piceance operations |  |  |
Segment Information |  |  |
Pre-tax gain on sale of properties |  |  | 121
Operating segments | Oil and Gas | South Texas oil and gas properties |  |  |
Segment Information |  |  |
Pre-tax gain on sale of properties |  |  | 59
Operating segments | Oil and Gas | Libya and Iraq operations |  |  |
Segment Information |  |  |
Impairment charges |  |  | 61
Operating segments | Chemical |  |  |
Segment Information |  |  |
Net sales | 4,657 | 4,355 | 3,756
Pretax operating profit (loss) | 1,159 | 822 | 571
Income taxes | 0 | 0 | 0
Discontinued operations, net |  |  | 0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 1,159 | 822 | 571
Investment in unconsolidated entities | 733 | 771 | 730
Property, plant and equipment additions, net | 277 | 323 | 353
Depreciation, depletion and amortization | 354 | 352 | 340
Total assets | 4,359 | 4,364 | 4,348
Operating segments | Chemical | Occidental Tower in Dallas |  |  |
Segment Information |  |  |
Pre-tax gain on sale of properties |  |  | 57
Operating segments | Chemical | Texas and non-core specialty business |  |  |
Segment Information |  |  |
Pre-tax gain on sale of properties |  |  | 31
Operating segments | Midstream and Marketing |  |  |
Segment Information |  |  |
Net sales | 3,656 | 1,157 | 684
Pretax operating profit (loss) | 2,802 | 85 | (381)
Income taxes | 0 | 0 | 0
Discontinued operations, net |  |  | 0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 2,802 | 85 | (381)
Investment in unconsolidated entities | 947 | 739 | 666
Property, plant and equipment additions, net | 221 | 296 | 370
Depreciation, depletion and amortization | 331 | 340 | 313
Total assets | 11,087 | 11,775 | 11,059
Impairment charges |  | 120 |
Operating segments | Midstream and Marketing | Oil |  |  |
Segment Information |  |  |
Loss from contract termination |  |  | 160
Corporate and Eliminations |  |  |
Segment Information |  |  |
Net sales | (930) | (874) | (727)
Pretax operating profit (loss) | (795) | (690) | (1,218)
Income taxes | (1,477) | (17) | 662
Discontinued operations, net |  |  | 428
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | (2,272) | (707) | (128)
Investment in unconsolidated entities | 0 | 5 | 5
Property, plant and equipment additions, net | 79 | 64 | 59
Depreciation, depletion and amortization | 38 | 41 | 40
Total assets | $ 3,534 | $ 2,292 | 3,572
Charge related to reserve for doubtful accounts |  |  | 541
Loss on distribution of stock |  |  | $ 78

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