PROPERTY, PLANT AND EQUIPMENT AND OPERATING LEASE RIGHT-OF-USE ASSETS - Operating Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Long-term (fixed)	$ 269	$ 310
Long-term (Variable)	61	63
Short-term	170	118
Total Operating lease expense	$ 499	$ 492