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INDUSTRY SEGMENTS AND GEOGRAPHIC AREAS - RESULTS OF OPERATIONS (Details) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) segment shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  | 3 |  |
Segment Information |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 25,956 | $ 17,809 | $ 20,911
Income (loss) from continuing operations before income taxes |  |  |  |  | 3,705 | (15,705) | 354
Income tax (expense) benefit |  |  |  |  | (915) | 2,172 | (861)
Income (loss) from continuing operations |  |  |  |  | 2,790 | (13,533) | (507)
Investments in unconsolidated entities | $ 2,938 |  |  |  | 2,938 | 3,250 | 6,389
Property, plant and equipment additions |  |  |  |  | 2,931 | 2,619 | 6,453
Depreciation, depletion and amortization |  |  |  |  | 8,447 | 8,097 | 6,140
Total assets | $ 75,036 |  |  |  | 75,036 | 80,064 | 107,190
Gains (losses) on interest rate swaps and warrants, net |  |  |  |  | 122 | (423) | 233
Impairment and related charges |  |  | $ 8,600 |  |  |  | 285
Anadarko Acquisition-related costs |  |  |  |  | 153 | 339 | 1,647
Employee severance and related costs |  |  |  |  |  |  | 1,000
Crucial seismic data |  |  |  |  |  |  | 401
Bank, legal and consulting fees |  |  |  |  |  |  | 213
Pre-tax adjustment expense (benefit) |  |  |  |  | $ 200 | (1,900) | (245)
WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Gain on sale |  | $ 102 |  |  |  |  |
Number of shares sold (in shares) | shares | 2.5 | 11.5 |  |  | 14.0 |  |
Goodwill derecognized |  |  |  | $ 1,200 |  |  |
Oil and gas |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Impairment and related charges |  |  | $ 6,400 | $ 581 |  |  |
Operating segments | Oil and gas |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 18,941 | 13,066 | 13,941
Income (loss) from continuing operations before income taxes |  |  |  |  | 4,145 | (9,632) | 2,520
Income tax (expense) benefit |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  |  |  | 4,145 | (9,632) | 2,520
Investments in unconsolidated entities | $ 154 |  |  |  | 154 | 168 | 181
Property, plant and equipment additions |  |  |  |  | 2,458 | 2,279 | 5,571
Depreciation, depletion and amortization |  |  |  |  | 7,741 | 7,414 | 5,153
Total assets | 56,132 |  |  |  | 56,132 | 62,931 | 80,093
Pre-tax impairment charges |  |  |  |  | 282 |  | 285
Gains (losses) on interest rate swaps and warrants, net |  |  |  |  | (280) | 1,100 |
Impairment and related charges |  |  |  |  |  | 7,100 |
Pre-tax loss on sale of properties |  |  |  |  |  | 1,600 |
Gain on sale related to joint venture |  |  |  |  |  |  | 475
Pre-tax impairment and related charges on domestic undeveloped leases |  |  |  |  |  |  | 39
Operating segments | Chemical |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Net sales |  |  |  |  | 5,246 | 3,733 | 4,102
Income (loss) from continuing operations before income taxes |  |  |  |  | 1,544 | 664 | 799
Income tax (expense) benefit |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  |  |  | 1,544 | 664 | 799
Investments in unconsolidated entities | 608 |  |  |  | 608 | 645 | 689
Property, plant and equipment additions |  |  |  |  | 316 | 261 | 272
Depreciation, depletion and amortization |  |  |  |  | 343 | 356 | 368
Total assets | 4,671 |  |  |  | 4,671 | 4,326 | 4,361
Operating segments | Midstream and marketing |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Net sales |  |  |  |  | 2,863 | 1,768 | 4,132
Income (loss) from continuing operations before income taxes |  |  |  |  | 257 | (4,175) | 241
Income tax (expense) benefit |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  |  |  | 257 | (4,175) | 241
Investments in unconsolidated entities | 2,176 |  |  |  | 2,176 | 2,437 | 5,519
Property, plant and equipment additions |  |  |  |  | 107 | 50 | 475
Depreciation, depletion and amortization |  |  |  |  | 325 | 312 | 563
Total assets | 11,132 |  |  |  | 11,132 | 9,856 | 14,915
Operating segments | Midstream and marketing | Plains All American Pipeline, LP | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Pre-tax gain on sale of equity investment |  |  |  |  |  |  | 114
Operating segments | Midstream and marketing | WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Gains (losses) on interest rate swaps and warrants, net |  |  |  |  | (252) |  |
Gain on sale |  |  |  |  | $ 124 |  |
Number of shares sold (in shares) | shares |  |  |  |  | 11.5 |  |
Impairment of equity method investment |  |  |  |  |  | 2,700 |
Goodwill derecognized |  |  |  |  |  | 1,400 |
Equity method investment, loss from goodwill impairment |  |  |  |  |  | 236 |
Charge upon loss of control |  |  |  |  |  |  | 1,000
Operating segments | Midstream and marketing | Interest Rate Swaps | WES | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Mark to market gain on interest rate swap |  |  |  |  |  |  | 30
Corporate and eliminations |  |  |  |  |  |  |
Segment Information |  |  |  |  |  |  |
Net sales |  |  |  |  | $ (1,094) | (758) | (1,264)
Income (loss) from continuing operations before income taxes |  |  |  |  | (2,241) | (2,562) | (3,206)
Income tax (expense) benefit |  |  |  |  | (915) | 2,172 | (861)
Income (loss) from continuing operations |  |  |  |  | (3,156) | (390) | (4,067)
Investments in unconsolidated entities | 0 |  |  |  | 0 | 0 | 0
Property, plant and equipment additions |  |  |  |  | 50 | 29 | 135
Depreciation, depletion and amortization |  |  |  |  | 38 | 15 | 56
Total assets | $ 3,101 |  |  |  | 3,101 | 2,951 | $ 7,821
Anadarko Acquisition-related costs |  |  |  |  | 153 | 339 |
Mark to market gain (loss) on interest rate swaps |  |  |  |  | 122 | $ (428) |
Early debt extinguishment expenses |  |  |  |  | $ 118 |  |

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