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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Midstream |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | $ 814
Proved and unproved non-core Permian acreages |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges | $ 397 |  |
Proved gas and oil properties |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  | $ 15 | 6,500
Williston Basin |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 763
Piceance basin |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 460
South Texas |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 554
Oman |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 1,800
Iraq and Libya |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 1,300
Qatar |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 1,000
Colombia and Bolivia |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 550
Impaired proved oil and gas assets - international |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | 4,700
Recurring | Fair Value | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 39 | 43 |
Recurring | Fair Value | Deferred credits and liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 147 | 178 |
Recurring | Fair Value | Level 2 | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 39 | 43 |
Recurring | Fair Value | Level 2 | Deferred credits and liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | $ 147 | $ 178 |
Non recurring | Low end of range |  |  |
Fair Values - Nonrecurring |  |  |
Risk adjusted discount rate | 8.00% |  |
Non recurring | High end of range |  |  |
Fair Values - Nonrecurring |  |  |
Risk adjusted discount rate | 20.00% |  |
Operating segments | Chemical |  |  |
Fair Values - Nonrecurring |  |  |
Impairment charges |  |  | $ 121

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