PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gains) losses	$ (343)
Pension
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning	6,698	$ 5,834
Service cost	57	53	$ 64
Interest cost	265	271	244
Plan participants’ contributions	0	0
Actuarial (gains) losses	(309)	1,006
Foreign currency translation	(159)	(87)
Benefits paid (includes lump sum settlements)	(342)	(391)
Plan amendments and other	(1)	1
Special/contractual termination benefits	0	7
Plan transfer/Acquisitions	2	4
Projected benefit obligation, ending	6,211	6,698	5,834
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation, beginning	303	321
Service cost	0	1	1
Interest cost	9	10	12
Plan participants’ contributions	9	13
Actuarial (gains) losses	(34)	4
Foreign currency translation	(15)	(7)
Benefits paid (includes lump sum settlements)	(32)	(44)
Plan amendments and other	0	2
Special/contractual termination benefits	0	0
Plan transfer/Acquisitions	0	3
Projected benefit obligation, ending	$ 240	$ 303	$ 321