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INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS - RESULTS OF OPERATIONS (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of operating segments | segment |  |  | 3 |  |
Segment Information |  |  |  |  |
Net sales |  |  | $ 17,809 | $ 20,911 | $ 17,824
Income (loss) from continuing operations before income taxes |  |  | (15,705) | 354 | 5,608
Income tax expense |  |  | 2,172 | (861) | (1,477)
Income (loss) from continuing operations |  |  | (13,533) | (507) | 4,131
INVESTMENTS IN UNCONSOLIDATED ENTITIES |  |  | 3,250 | 6,389 | 1,680
Property, plant and equipment additions |  |  | 2,619 | 6,453 | 5,020
Depreciation, depletion and amortization |  |  | 8,097 | 6,140 | 3,977
Total assets |  |  | 80,064 | 107,190 | 42,159
Pre-tax impairment and related charges on domestic undeveloped leases |  |  |  | 285 |
Impairments of assets | $ 8,600 |  |  | 285 |
Employee severance and related costs |  |  |  | 1,000 |
Crucial seismic data |  |  |  | 401 |
Bank, legal and consulting fees |  |  |  | 213 |
Tax expense (benefit) of pre-tax adjustments |  |  | (1,900) | (245) | 198
Gains (losses) on interest rate swaps and warrants, net |  |  | (423) | 233 | 0
Goodwill derecognized |  | $ 1,200 |  |  |
Anadarko Acquisition-related costs |  |  | 339 | 1,647 | 0
Qatar ISND and ISSD |  |  |  |  |
Segment Information |  |  |  |  |
Impairments of assets |  |  |  |  | 416
Oil and gas |  |  |  |  |
Segment Information |  |  |  |  |
Impairments of assets | $ 6,400 | $ 581 |  |  |
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
Operating segments | Oil and gas |  |  |  |  |
Segment Information |  |  |  |  |
Net sales |  |  | 13,066 | 13,941 | 10,441
Income (loss) from continuing operations before income taxes |  |  | (9,632) | 2,520 | 2,442
Income tax expense |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  | (9,632) | 2,520 | 2,442
INVESTMENTS IN UNCONSOLIDATED ENTITIES |  |  | 168 | 181 | 0
Property, plant and equipment additions |  |  | 2,279 | 5,571 | 4,443
Depreciation, depletion and amortization |  |  | 7,414 | 5,153 | 3,254
Total assets |  |  | 62,931 | 80,093 | 24,874
Gain on sale |  |  |  | 475 |
Pre-tax impairment and related charges on domestic undeveloped leases |  |  |  | 39 |
Impairments of assets |  |  | 7,100 |  |
Impairment charges |  |  |  | 285 |
Pre-tax loss on sale of properties |  |  | 1,600 |  |
Gains (losses) on interest rate swaps and warrants, net |  |  | 1,100 |  |
Operating segments | Chemical |  |  |  |  |
Segment Information |  |  |  |  |
Net sales |  |  | 3,733 | 4,102 | 4,657
Income (loss) from continuing operations before income taxes |  |  | 664 | 799 | 1,159
Income tax expense |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  | 664 | 799 | 1,159
INVESTMENTS IN UNCONSOLIDATED ENTITIES |  |  | 645 | 689 | 733
Property, plant and equipment additions |  |  | 261 | 272 | 277
Depreciation, depletion and amortization |  |  | 356 | 368 | 354
Total assets |  |  | 4,326 | 4,361 | 4,359
Operating segments | Midstream and marketing |  |  |  |  |
Segment Information |  |  |  |  |
Net sales |  |  | 1,768 | 4,132 | 3,656
Income (loss) from continuing operations before income taxes |  |  | (4,175) | 241 | 2,802
Income tax expense |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  | (4,175) | 241 | 2,802
INVESTMENTS IN UNCONSOLIDATED ENTITIES |  |  | 2,437 | 5,519 | 947
Property, plant and equipment additions |  |  | 50 | 475 | 221
Depreciation, depletion and amortization |  |  | 312 | 563 | 331
Total assets |  |  | 9,856 | 14,915 | 9,392
Charge upon loss of control |  |  |  | 1,000 |
Pre-tax gain on sale of equity investment |  |  |  | 114 |
Impairment of equity method investment |  |  | 2,700 |  |
Equity method investment, loss from goodwill impairment |  |  | 236 |  |
Goodwill derecognized |  |  | 1,400 |  |
Operating segments | Midstream and marketing | Interest Rate Swaps |  |  |  |  |
Segment Information |  |  |  |  |
Mark to market gain on interest rate swap |  |  |  | 30 |
Corporate and eliminations |  |  |  |  |
Segment Information |  |  |  |  |
Net sales |  |  | (758) | (1,264) | (930)
Income (loss) from continuing operations before income taxes |  |  | (2,562) | (3,206) | (795)
Income tax expense |  |  | 2,172 | (861) | (1,477)
Income (loss) from continuing operations |  |  | (390) | (4,067) | (2,272)
INVESTMENTS IN UNCONSOLIDATED ENTITIES |  |  | 0 | 0 | 0
Property, plant and equipment additions |  |  | 29 | 135 | 79
Depreciation, depletion and amortization |  |  | 15 | 56 | 38
Total assets |  |  | 2,951 | $ 7,821 | $ 3,534
Anadarko Acquisition-related costs |  |  | 339 |  |
Loss on interest rate swaps |  |  | $ 428 |  |

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