PENSION AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Non-current pension liabilities	$ 1,002		$ 765
Defined contribution plan expense	42	$ 44
Pension Benefits [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the period	6	6
Interest cost on projected benefit obligation	51	61
Expected return on plan assets	(104)	(102)
Amortization of prior service credits	(1)	(1)
Amortization of net actuarial loss	19	24
Curtailments and settlements	22	27
Special termination benefits	1
Net periodic benefit cost/(credit)	(6)	15
Other Benefits [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the period	1	1
Interest cost on projected benefit obligation	3	3
Expected return on plan assets	(6)	(7)
Amortization of prior service credits	(1)	(1)
Amortization of net actuarial loss		1
Net periodic benefit cost/(credit)	$ (3)	$ (3)