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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details) a in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jul. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Apr. 30, 2017 USD ($) | Nov. 30, 2016 USD ($) | Oct. 31, 2016 USD ($) a | Sep. 30, 2016 USD ($) | Aug. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | May 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Feb. 29, 2016 USD ($) | Jan. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) divestiture | Jun. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,020,000,000 | $ 3,651,000,000 | $ 2,780,000,000
Net proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 978,000,000 | 0 | 4,203,000,000
Crude oil supply agreements termination costs |  |  |  |  |  |  |  |  | $ 160,000,000 |  |  |  |  |  |  |  |  |  |  |  | 160,000,000
Seminole-San Andres EOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired business assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |
Permian region |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired business assets |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres acquired | a |  |  |  |  |  |  | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Republic of Ecuador | International Center for the Settlement of Investment Disputes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 330,000,000 |  |  |
Award amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Pre-tax gain on settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 681,000,000
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  | $ 1,500,000,000.0 |  |  |  |  |  | $ 2,750,000,000.00 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  |  | 1,490,000,000 |  |  |  |  |  | 2,720,000,000 |  |  |  |  |  |  |  |  |
3.00% senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.10% senior notes due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.75% senior notes due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |
Early repayment of debt through exercise of redemption option |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000.00 |  |  |  |  |  |  |  |  |  |
4.125% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  | 4.125% |  |  |  |  |  |  |  | 4.125% |  |  |
Retired debt |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
2.60% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |
3.40% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  | $ 1,150,000,000.00 |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |
4.40% senior notes due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 4.40% |  |  |  |  |  |  |  |  |
2.50% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |
Senior notes repaid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |
Spin-off California Resources Corp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges related to a special stock dividend of California Resources shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 78,000,000 |  |  |  |  |  |  |  |
Occidental Tower building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,000,000 |  |  |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,000,000 |  |  |  |  |  |
4.2% senior notes due 2048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 4.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of debt instrument |  |  | $ 985,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.50% senior notes due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |
Early repayment of debt through exercise of redemption option |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  | $ 3,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility term |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previously Leased Power And Steam Cogeneration Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost |  | $ 443,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Non Core Midstream Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration | $ 2,600,000,000 |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received for divested assets | 2,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax net gain from divestiture | $ 907,000,000 |  | $ 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | Non-strategic acreage in Permian Basin Counties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |
Number of divestitures of non-strategic acreage | divestiture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 81,000,000 |  |  |  |
Disposed of by sale | Non-core Permian acreage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |  | 90,000,000 |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  |  |
Disposed of by sale | South Texas operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | South Texas Eagle Ford non-operated properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  | $ 63,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  | $ 59,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | Piceance operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  | 153,000,000 |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  |  |  |  |  | $ 121,000,000 |  |  |  |  |  |  |  |
Assets held for sale | Non-core Permian acreage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  | $ 500,000,000 |

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