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INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS - RESULTS OF OPERATIONS (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Segment Information |  |  |  |
Number of operating segments | segment | 3 |  |  |
Net sales | $ 12,508 | $ 10,090 | $ 12,480 |
Pretax operating profit (loss) | 1,328 | (1,664) | (9,476) |
Income taxes | (17) | 662 | 1,330 |
Discontinued operations, net |  | 428 | 317 |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 1,311 | (574) | (7,829) |
Investment in unconsolidated entities | 1,515 | 1,401 | 1,267 |
Property, plant and equipment additions, net | 3,651 | 2,780 | 5,409 |
Depreciation, depletion and amortization | 4,002 | 4,268 | 4,544 |
Total assets | 42,026 | 43,109 | 43,409 |
Total Foreign |  |  |  |
Segment Information |  |  |  |
Net sales | $ 4,423 | $ 3,800 | $ 5,001 |
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 | 57.00% | 57.00% | 56.00% |
Chemical | Product Concentration | Vinyls |  |  |  |
Segment Information |  |  |  |
Percentage sales | 42.00% | 40.00% | 40.00% |
Chemical | Product Concentration | Other Chemicals |  |  |  |
Segment Information |  |  |  |
Percentage sales | 1.00% | 3.00% | 4.00% |
Midstream and Marketing | Product Concentration | Gas Processing |  |  |  |
Segment Information |  |  |  |
Percentage sales | 69.00% | 92.00% | 70.00% |
Midstream and Marketing | Product Concentration | Power |  |  |  |
Segment Information |  |  |  |
Percentage sales | 28.00% | 44.00% | 31.00% |
Midstream and Marketing | Product Concentration | Marketing, Trading, Transportation and other |  |  |  |
Segment Information |  |  |  |
Percentage sales | 3.00% | (36.00%) | (1.00%) |
Operating segments | Oil and Gas |  |  |  |
Segment Information |  |  |  |
Net sales | $ 7,870 | $ 6,377 | $ 8,304 |
Pretax operating profit (loss) | 1,111 | (636) | (8,060) |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 1,111 | (636) | (8,060) |
Pre-tax gain on sale of properties |  | 24 |  |
Investment in unconsolidated entities |  |  | 4 |
Property, plant and equipment additions, net | 2,968 | 1,998 | 4,485 |
Depreciation, depletion and amortization | 3,269 | 3,575 | 3,886 |
Total assets | 23,595 | 24,130 | 23,591 |
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 | Oil and Gas | Total Foreign |  |  |  |
Segment Information |  |  |  |
Impairment charges |  |  | 5,000 |
Operating segments | Oil and Gas | Domestic oil and gas assets |  |  |  |
Segment Information |  |  |  |
Impairment charges |  |  | 3,500 |
Operating segments | Chemical |  |  |  |
Segment Information |  |  |  |
Net sales | 4,355 | 3,756 | 3,945 |
Pretax operating profit (loss) | 822 | 571 | 542 |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 822 | 571 | 542 |
Pre-tax gain on sale of properties |  |  | 98 |
Impairment charges |  |  | 121 |
Investment in unconsolidated entities | 771 | 730 | 550 |
Property, plant and equipment additions, net | 323 | 353 | 271 |
Depreciation, depletion and amortization | 352 | 340 | 371 |
Total assets | 4,364 | 4,348 | 3,982 |
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 | 1,157 | 684 | 891 |
Pretax operating profit (loss) | 85 | (381) | (1,194) |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | 85 | (381) | (1,194) |
Impairment charges | 120 |  | 1,300 |
Investment in unconsolidated entities | 739 | 666 | 708 |
Property, plant and equipment additions, net | 296 | 370 | 611 |
Depreciation, depletion and amortization | 340 | 313 | 249 |
Total assets | 11,775 | 11,059 | 10,175 |
Operating segments | Midstream and Marketing | Oil |  |  |  |
Segment Information |  |  |  |
Loss from contract termination |  | 160 |  |
Corporate and Eliminations |  |  |  |
Segment Information |  |  |  |
Net sales | (874) | (727) | (660) |
Pretax operating profit (loss) | (690) | (1,218) | (764) |
Income taxes | (17) | 662 | 1,330 |
Discontinued operations, net |  | 428 | 317 |
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK | (707) | (128) | 883 |
Investment in unconsolidated entities | 5 | 5 | 5 |
Property, plant and equipment additions, net | 64 | 59 | 42 |
Depreciation, depletion and amortization | 41 | 40 | 38 |
Total assets | $ 2,292 | $ 3,572 | $ 5,661 |

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