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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
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 ($) | Nov. 30, 2015 USD ($) | Oct. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) item | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,203 | $ 1,478
Crude oil supply agreements termination costs |  |  |  |  | $ 160 |  |  |  |  |  |  |  |  |  |  |  |  | 160 |
Seminole-San Andres EOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired business assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |
Republic of Ecuador | International Center for the Settlement of Investment Disputes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 330 |  |
Award amount |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Pre-tax gain on settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 681 |
Pre-tax gain on settlement as of date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 322
Permian region |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres acquired | a |  |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired business assets |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  | $ 1,500 |  |  |  |  |  | $ 2,750 |  |  |  |  |  | $ 1,500 |  |  |  |  |
Net proceeds from issuance of long-term debt |  | 1,490 |  |  |  |  |  | 2,720 |  |  |  |  |  | 1,480 |  |  |  |  |
3.00% senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  | 3.00% |
4.10% senior notes due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  | 4.10% |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |
4.125% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 4.125% |  |  |  |  |  |  |  |  |  |  | 4.125% |  |
Retired debt |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |
2.60% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  | 2.60% |  |  | 2.60% |
3.40% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  | $ 1,150 |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  | 3.40% |  |  | 3.40% |
4.40% senior notes due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  | 4.40% |  |  |  |  |  |  | 4.40% |  |  | 4.40% |
2.50% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Maturities of Senior Debt |  |  |  |  |  |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |
3.50% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 3.50% |  |  | 3.50% |
4.625% senior notes due 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.625% | 4.625% |  |  | 4.625% |
Spin-off California Resources Corp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges related to a special stock dividend of California Resources shares |  |  |  |  |  |  |  |  | $ 78 |  |  |  |  |  |  |  |  |  |
Non-core Permian acreage | Assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Non-core Permian acreage | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55 |  |  |  |
Non-strategic acreage in Permian Basin Counties | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of divestitures of non-strategic acreage | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 81 |  |  |
South Texas operations | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Texas Eagle Ford non-operated properties | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  | $ 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  | $ 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Williston operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property held-for-sale |  |  |  |  |  |  |  |  |  |  |  | $ 590 |  |  |  |  |  |  |
Piceance operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155
Piceance operations | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  | 153 |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  |  | $ 121 |  |  |  |  |  |  |  |  |  |
Westwood building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  |  |  |  |
Occidental Tower building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  |  |  | 85 |  |  |  |  |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  |  | $ 57 |  |  |  |  |  |  |  |

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