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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