PENSION AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Non-current pension liabilities	$ 383		$ 383		$ 456
Defined contribution plan expense	49	$ 46	134	$ 142
Pension Benefits [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the period	6	7	20	19
Interest cost on projected benefit obligation	50	48	146	142
Expected return on plan assets	(97)	(104)	(315)	(308)
Amortization of prior service credits	(1)	(1)	(3)	(3)
Amortization of net actuarial (gain)/loss	17	20	57	61
Curtailments and settlements	26	22	95	91
Net periodic benefit cost/(credit)	$ 1	$ (8)	$ 0	$ 2