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