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INCOME TAXES (Components of deferred tax assets and liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Foreign | $ 2,882 | $ 1,707 | $ 461
U.S. | 20 | (5,179) | $ (14,589)
Deferred tax assets: |  |  |
Foreign tax credits | 2,129 | 2,094 |
Accrued expenses | 789 | 923 |
Oil and gas properties | 236 | 346 |
AMT credits | 490 | 444 |
Net operating losses | 2,043 | 2,898 |
Employee benefit plans | 248 | 403 |
Other | 259 | 485 |
Deferred tax assets | 5,704 | 7,593 |
Valuation allowances | (4,575) | (6,058) |
Net deferred tax assets | 1,129 | 1,535 |
Deferred tax liabilities: |  |  |
Property, plant, equipment and mine development costs | (3,710) | (4,326) |
Undistributed earnings | (811) | (779) |
Other | (226) | (195) |
Total deferred tax liabilities | (4,747) | (5,300) |
Net deferred tax liabilities | (3,618) | $ (3,765) |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
U.S. | 5,300 |  |
Deferred tax assets: |  |  |
Valuation allowances | (280) |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Foreign | 5,300 |  |
Deferred tax assets: |  |  |
Foreign tax credits | $ 1,100 |  |

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