SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid	$ 351	$ 312	$ 246
Capitalized interest	52	64	138
Continuing operations
SUPPLEMENTAL CASH FLOW INFORMATION
Foreign, state and federal income taxes paid for continuing operations	800	600	1,000
Tax refund	800	300
Production, property and other taxes paid	$ 375	$ 345	$ 445