SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid	$ 383	$ 351	$ 312
Capitalized interest	46	52	64
Continuing operations
SUPPLEMENTAL CASH FLOW INFORMATION
Foreign, state and federal income taxes paid for continuing operations	1,100	800	600
Tax refund	82	768	325
Production, property and other taxes paid	$ 505	$ 375	$ 345