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, 2015	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 484	$ 411		$ 471
Interest cost	975	1,096		1,012
Expected return on plan assets	(1,382)	(1,322)		(1,248)
Amortization of prior service cost (credit)	(28)	22		25
Amortization of unrecognized (gain) loss	706	500		788
Curtailment/settlement/other	0	(2)	[1]	5	[2]
Net periodic benefit cost	755	705		1,053
Net (gain) loss	(127)	3,528		(2,343)
Prior service cost (credit) arising during period	63	(500)		0
Amortization of prior service (cost) credit	(28)	22		25
Amortization of unrecognized gain (loss)	(706)	(498)		(793)
Total recognized in other comprehensive (income) loss	(742)	2,508		(3,161)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	13	3,213		(2,108)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	14		19
Interest cost	59	72		78
Expected return on plan assets	0	0		0
Amortization of prior service cost (credit)	(2)	(2)		(4)
Amortization of unrecognized (gain) loss	(11)	(14)		4
Curtailment/settlement/other	0	0		0
Net periodic benefit cost	60	70		97
Net (gain) loss	11	63		(404)
Prior service cost (credit) arising during period	0	0		0
Amortization of prior service (cost) credit	(2)	(2)		(4)
Amortization of unrecognized gain (loss)	11	14		(4)
Total recognized in other comprehensive (income) loss	24	79		(404)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ 84	$ 149		$ (307)

[1] The 2014 impact relates to settlements associated with the wind-up of a pension plan in The Netherlands and a pension plan in Canada.

[2] The 2013 impact primarily relates to settlements associated with the wind-up of a Canadian pension plan.