SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SUPPLEMENTAL CASH FLOW INFORMATION
Interest paid	$ 1,600	$ 912	$ 383
Capitalized interest	83	89	46
Continuing operations
SUPPLEMENTAL CASH FLOW INFORMATION
Foreign, state and federal income taxes paid for continuing operations	500	1,900	1,100
Tax refund	223	80	82
Production, property and other taxes paid	$ 755	$ 724	$ 508