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DIVESTITURES AND OTHER TRANSACTIONS - NARRATIVE (Details) ft² in Thousands, a in Millions, $ in Millions |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 23, 2019 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) ft² | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jul. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 31, 2020 USD ($) a | Mar. 31, 2019 USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from real estate assets disposed |  |  |  | $ 565 |  |  |  |  |  |  |  |  |  |  |
Finance lease |  | $ 358 |  |  |  |  |  |  |  | $ 358 | $ 358 |  |  |  |
Acquisition cost |  |  |  |  |  |  |  |  |  |  | $ 2,619 | $ 6,453 | $ 5,020 |  |
Previously Leased Power And Steam Cogeneration Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost |  |  |  |  |  |  |  | $ 443 |  |  |  |  |  |  |
Ecopetrol Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of development in joint venture | ft² |  |  |  |  | 97 |  |  |  |  |  |  |  |  |  |
Ownership percentage in joint venture |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |
Plains All American Pipeline, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of equity investment |  |  |  |  |  | $ 646 |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of equity investment | $ 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ecopetrol | Ecopetrol Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due at closing |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |
Carried capital |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |
Minority interest in new venture |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  | $ 563 |  |  |  |  |  |  |  |  |  |
Percentage share of capital expenditures |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |
Share of capital expenditures (up to) |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |
Failed Sale-Leaseback |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  | 13 years |  |  |  |  |  |  |  | 13 years | 13 years |  |  |  |
Finance lease |  | $ 300 |  | $ 300 |  |  |  |  |  | $ 300 | $ 300 | $ 300 |  |  |
Disposed of by sale | Oil and Gas Columbia Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  | $ 353 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | Non-core Permian acreage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  |  |  |  |  |  |  |  |  | $ 820 |  |  |  |  |
Disposed of by sale | Wyoming, Colorado, and Utah Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale |  |  | $ 440 |  |  |  |  |  |  |  |  |  |  |  |
Area of land sold (in acres) | a |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.5 |
Area of fee surface acres (in acres) | a |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,330 |
Liabilities associated with sale |  |  | 329 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received for divested assets |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Non Core Midstream Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  | $ 2,600 |  |  |  |  |  |  |  |  | $ 150
Proceeds received for divested assets |  |  |  |  |  |  | $ 2,400 |  |  |  |  |  |  |  |
Pre-tax net gain from divestiture |  |  |  |  |  |  | $ 907 |  | $ 43 |  |  |  |  |  |

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