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OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Defined Contribution Plan) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Liabilities | $ 24,324 | $ 26,006 |
Other liabilities | 2,230 | 2,012 |
Costs charged to operations for employee savings plans and defined contribution plans | 75 | 65 | $ 78
Costs capitalized to oil and gas properties for employee savings plans and defined benefit contribution plans | 0 | 0 | $ 4
401K Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Liabilities | $ 45 | $ 46 |

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