PENSION AND POSTRETIREMENT BENEFIT PLANS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Total net periodic benefit cost/(credit)	$ (27)	$ (1)	$ (72)
Pension Plans, Defined Benefit [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the year	26	25	24
Interest cost on projected benefit obligation	193	188	192
Expected return on plan assets	(386)	(411)	(418)
Amortization of prior service costs	(4)	(4)	(3)
Amortization of net actuarial (gain)/loss	74	82	84
Curtailments	121	159	91
Special termination benefits	0	3	1
Total net periodic benefit cost/(credit)	$ 24	$ 42	$ (29)