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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Values - Nonrecurring |  |  |
Pre-tax impairment and related charges on domestic undeveloped leases | $ 285 |  |
Impairments of assets | 285 |  |
Qatar ISSD |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges | 39 |  |
Impairments of assets | 39 |  |
Qatar ISND and ISSD |  |  |
Fair Values - Nonrecurring |  |  |
Impairments of assets |  | $ 416 |
Proved and unproved non-core Permian acreages |  |  |
Fair Values - Nonrecurring |  |  |
Pre-tax impairment charges |  |  | $ 397
WES |  |  |
Fair Values - Nonrecurring |  |  |
Charge recorded as a result of loss of control | 1,000 |  |
Recurring | Accrued liabilities |  |  |
Liabilities: |  |  |
Netting and Collateral | 0 | 0 |
Recurring | Deferred credits and other liabilities - other |  |  |
Liabilities: |  |  |
Netting and Collateral | 0 | 0 |
Recurring | Level 1 | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 0 | 0 |
Recurring | Level 1 | Deferred credits and other liabilities - other |  |  |
Liabilities: |  |  |
Embedded derivative | 0 | 0 |
Recurring | Level 2 | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 40 | 66 |
Recurring | Level 2 | Deferred credits and other liabilities - other |  |  |
Liabilities: |  |  |
Embedded derivative | 49 | 116 |
Recurring | Level 3 | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 0 | 0 |
Recurring | Level 3 | Deferred credits and other liabilities - other |  |  |
Liabilities: |  |  |
Embedded derivative | 0 | $ 0 |
Non recurring | Risk-Adjusted Discount Rate |  |  |
Fair Values - Nonrecurring |  |  |
Measurement input |  | 10.00% |
Fair Value | Recurring | Accrued liabilities |  |  |
Liabilities: |  |  |
Embedded derivative | 40 | $ 66 |
Fair Value | Recurring | Deferred credits and other liabilities - other |  |  |
Liabilities: |  |  |
Embedded derivative | $ 49 | $ 116 |

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