PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income for All Significant Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 39	$ 44	$ 30
Interest cost	131	164	183
Expected return on plan assets	(217)	(226)	(232)
Amortization of prior service cost (credit)	(1)	(1)	6
Amortization of net (gain) loss	75	87	66
Defined Benefit Plan, Net Periodic Benefit Cost	27	68	53
Net (gain) loss	208	34	450
Prior service cost (credit) arising during period	0	4	(38)
Amortization of prior service (cost) credit	1	1	(6)
Amortization of net (gain) loss	(75)	(87)	(66)
Total recognized in other comprehensive (income) loss	134	(48)	340
Total recognized in net periodic benefit cost and other comprehensive loss	161	20	393
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest cost	8	10	13
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	0	(1)	0
Amortization of net (gain) loss	(7)	(10)	(10)
Defined Benefit Plan, Net Periodic Benefit Cost	2	0	4
Net (gain) loss	4	19	(12)
Prior service cost (credit) arising during period	0	0	0
Amortization of prior service (cost) credit	0	1	0
Amortization of net (gain) loss	7	10	10
Total recognized in other comprehensive (income) loss	11	30	(2)
Total recognized in net periodic benefit cost and other comprehensive loss	$ 13	$ 30	$ 2