OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Defined Contribution Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Liabilities	$ 26,006	$ 28,060
Accounts payable and accrued liabilities	2,321	2,393
Other liabilities	2,012	1,745
Costs charged to operations for employee savings plans and defined contribution plans	65	78	$ 98
Costs capitalized to oil and gas properties for employee savings plans and defined benefit contribution plans	0	4	$ 13
401K Plan
Defined Contribution Plan Disclosure [Line Items]
Liabilities	$ 46	$ 47