PENSION AND POSTRETIREMENT BENEFIT PLANS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Percentage of plan assets attributable to the principal defined benefit pension plan	65.00%
Percentage of plan obligations attributable to the principal defined benefit pension plan	61.00%
Pension Plans, Defined Benefit [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the year	$ 25	$ 34	$ 38
Interest cost on projected benefit obligation	242	305	302
Expected return on plan assets	(405)	(508)	(519)
Amortization of prior service costs	(3)	(3)	(4)
Amortization of net actuarial (gain)/loss	91	110	134
Curtailments	(1)	1
Settlements	161	866	165
Special termination benefits		14
Total net periodic benefit cost/(credit)	110	819	116
Pension obligation settlement	336	1,774
Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the year	4	4	8
Interest cost on projected benefit obligation	13	14	13
Expected return on plan assets	(27)	(27)	(26)
Amortization of prior service costs	(6)	(1)	(2)
Amortization of net actuarial (gain)/loss	3	(2)	1
Curtailments		(4)
Total net periodic benefit cost/(credit)	$ (13)	(16)	$ (6)
United States Pension Plans
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Settlements		713
Pension obligation settlement		$ 1,500