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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
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 ($) | Dec. 31, 2014 USD ($) a | Nov. 30, 2014 USD ($) | Apr. 30, 2014 USD ($) | Feb. 28, 2014 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,203.0 | $ 1,478.0
Crude oil supply agreements termination costs |  |  |  | $ 160.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160.0 |
Libya |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairments of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 61.0 |
Republic of Ecuador | International Center for the Settlement of Investment Disputes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 330.0 |  |  |
Award amount |  |  |  |  |  |  |  |  |  | $ 1,000.0 |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 681.0 |  |
Pre-tax gain on settlement as of date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 322.0
Permian region |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres acquired | a |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Cash paid on acquisition |  | $ 2,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 1,300.0 |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued | $ 1,500.0 |  |  |  |  |  | $ 2,750.0 |  |  |  |  |  | $ 1,500.0 |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt | 1,490.0 |  |  |  |  |  | 2,720.0 |  |  |  |  |  | 1,480.0 |  |  |  |  |  |  |  |
3.00% senior notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |
4.10% senior notes due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.10% |
1.75% senior notes due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75%
Early repayment of debt through exercise of redemption option |  |  |  |  |  | $ 1,250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.125% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 4.125% |  |  |  |  |  |  |  |  |  |  |  |  | 4.125% |  |  | 4.125%
Retired debt |  |  |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.60% senior notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  | $ 400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |  |  |  |  |  |  | 2.60% |
3.40% senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  | $ 1,150.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  | 3.40% |
4.40% senior notes due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  | $ 1,200.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 4.40% |  |  |  |  |  |  |  |  |  |  |  |  | 4.40% |
2.50% senior notes due 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Maturities of Senior Debt |  |  |  |  |  |  |  |  | $ 700.0 |  |  |  |  |  |  |  |  |  |  |  |
3.50% senior unsecured notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 750.0 |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  | 3.50% | 3.50%
4.625% senior unsecured notes due 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 750.0 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 78.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock distributed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81.30% |  |  |  |  |  |
South Texas Eagle Ford non-operated properties | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  | $ 63.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on disposal |  |  | $ 59.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hugoton Field operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 531.0 |  |  |  |  |
Pre-tax proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300.0 | $ 1,400.0 |  |  |  |
Williston operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of property held-for-sale |  |  |  |  |  |  |  |  |  |  | $ 590.0 |  |  |  |  |  |  |  |  |  |
Piceance operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155.0
Piceance operations | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale consideration |  |  |  |  |  |  |  | 153.0 |  |  |  |  |  |  |  |  |  |  | $ 153.0 |  |
Pre-tax gain on disposal |  |  |  |  |  |  |  | $ 121.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Southern leg of BridgeTex Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |  |  |  |  |  |
Westwood building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  |  |  |  | $ 65.0 |  |  |  |  |  |  |  |  |
Occidental Tower building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  |  |  |  |  | 85.0 |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of property |  |  |  |  |  |  |  |  |  | $ 57.0 |  |  |  |  |  |  |  |  |  |  |
General Partner of Plains All American Pipeline,L.P |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700.0 |  |  |  |  |  |
Gain on sale of equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400.0 |  |  |  |  |  |
BridgeTex |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions, dispositions and other transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of transactions involved in sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,075.0 |  |  |  |  |  |
Gain on sale of equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 633.0 |  |  |  |  |  |

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