PENSION AND POSTRETIREMENT BENEFIT PLANS (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	$ 34	$ 38	$ 32
Interest cost on projected benefit obligation	305	302	319
Expected return on plan assets	(508)	(519)	(508)
Amortization of prior service costs	(3)	(4)	(3)
Amortization of net actuarial (gain)/loss	110	134	129
Curtailments	1		(1)
Settlements	866	165	160
Special termination benefits	14
Total net periodic benefit cost/(credit)	819	116	128
Pension obligation settlement	1,774	350
Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Service cost - benefits earned during the year	4	8	8
Interest cost on projected benefit obligation	14	13	22
Expected return on plan assets	(27)	(26)	(25)
Amortization of prior service costs	(1)	(2)	(2)
Amortization of net actuarial (gain)/loss	(2)	1	10
Curtailments	(4)
Total net periodic benefit cost/(credit)	(16)	(6)	13
United States Pension Plans
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Settlements	713
Pension obligation settlement	$ 1,500