PROPERTY, PLANT AND EQUIPMENT AND OPERATING LEASE RIGHT-OF-USE ASSETS - Operating Lease Right-of-Use Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Right-of-use assets	$ 4,016	$ 0
Lease liabilities	$ 4,180	$ 0
Lease term	12 years