PROPERTY, PLANT AND EQUIPMENT - Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Original cost	$ 75,619		$ 75,187
Less accumulated depreciation and amortization	(32,453)		(31,897)
Property, plant and equipment – net	43,166		$ 43,290
Consolidated depreciation and amortization on property, plant and equipment	991	$ 995
Operating lease income	876	932
Fixed lease income	705	764
Variable lease income	$ 171	$ 168