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FAIR VALUE MEASUREMENTS (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / MillionCubicFeet $ / Barrel | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  | $ 8,600 |  |  |  | $ 285 |
Goodwill derecognized |  |  | $ 1,200 |  |  |  |
Pre-tax impairment and related charges on domestic undeveloped leases |  |  |  |  |  | 285 |
WES |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Goodwill derecognized |  |  | 1,200 |  |  |  |
Impairment of equity method investment | $ 2,700 |  |  |  |  | 1,000 |
Other-than-temporary impairment loss | $ 2,700 |  |  | $ 2,700 |  |  |
Low end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Operating and capital cost estimates, percentage |  |  |  |  | 1.00% |  |
Operating and capital cost estimates (in dollars per barrel) | $ / Barrel |  |  |  |  | 50 |  |
High end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Operating and capital cost estimates, percentage |  |  |  |  | 2.00% |  |
Operating and capital cost estimates (in dollars per barrel) | $ / Barrel |  |  |  |  | 60 |  |
Oil |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 62.42 |  |
Unweighted arithmetic average price (in dollars per barrel) | $ / Barrel |  |  |  |  | 59.17 |  |
Unweighted arithmetic average price, period |  |  |  |  | 15 years |  |
Oil | Low end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 40 |  |
Oil | High end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 70 |  |
Natural Gas |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Unweighted arithmetic average price (in dollars per barrel) | $ / MillionCubicFeet |  |  |  |  | 3.13 |  |
Unweighted arithmetic average price, period |  |  |  |  | 15 years |  |
Natural Gas | Low end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Sales price (dollars per barrel) | $ / MillionCubicFeet |  |  |  |  | 2.00 |  |
Natural Gas | High end of range |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Sales price (dollars per barrel) | $ / MillionCubicFeet |  |  |  |  | 3.60 |  |
Oman, Bolivia and the Gulf of Mexico |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  | 293 |  |  |  |
Gulf of Mexico |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  | 241 |  | $ 1,200 |  |
Algeria Oil and Gas Proved Properties |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | 900 |  |
Qatar ISSD |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  |  | 39 |
Pre-tax impairment charges |  |  |  |  |  | 39 |
Qatar ISND and ISSD |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  |  |  | $ 416
Level 2 | Domestic Onshore Unproved Acreage |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | $ 4,300 |  |
Level 3 | Measurement Input, Weighted Average Cost of Capital |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Discount rate |  |  |  |  | 10.00% |  |
Recurring | Accrued liabilities |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Netting and Collateral |  |  |  |  | $ 0 | 0 |
Recurring | Accrued liabilities | Fair Value |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  | 64 | 40 |
Recurring | Accrued liabilities | Level 1 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  | 0 | 0 |
Recurring | Accrued liabilities | Level 2 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  | 64 | 40 |
Recurring | Accrued liabilities | Level 3 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  | 0 | 0 |
Recurring | Deferred credits and other liabilities - other |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Netting and Collateral |  |  |  |  |  | 0 |
Recurring | Deferred credits and other liabilities - other | Fair Value |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  | 49 |
Recurring | Deferred credits and other liabilities - other | Level 1 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  | 0 |
Recurring | Deferred credits and other liabilities - other | Level 2 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  | 49 |
Recurring | Deferred credits and other liabilities - other | Level 3 |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  | 0 |
Non recurring |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 1,153 |  |
Oil and gas properties - proved |  |  |  |  | 2,436 |  |
Oil and gas properties - unproved |  |  |  |  | 4,591 |  |
Oil and gas properties - discontinued operations, net |  |  |  |  | 2,191 |  |
WES equity investment |  |  |  |  | 2,673 |  |
Ghana Assets |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  | $ 2,200 |  |
Ghana Assets | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  | 2,200 |  |  |  |  |
Impairment and related charges, net of tax |  | 1,400 |  |  |  |  |
Oil and gas |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  | $ 6,400 | $ 581 |  |  |  |
Midstream and marketing |  |  |  |  |  |  |
Embedded derivatives |  |  |  |  |  |  |
Impairment and related charges |  |  |  |  |  |  | $ 100
Goodwill |  |  |  |  |  | $ 1,200 |

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