LEASES (Costs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 73	$ 146
Finance lease cost:
Amortization of leased assets	2	4
Interest on lease liabilities	1	2
Net lease cost	76	152
Short-term leases and variable lease costs	$ 29	$ 58