PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 10	$ 9	$ 28	$ 27
Interest cost	33	33	97	99
Expected return on plan assets	(56)	(54)	(166)	(162)
Amortization of net (gain) loss	20	19	62	57
Net periodic benefit cost	7	7	21	21
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	2	2	6	6
Amortization of net (gain) loss	(2)	(2)	(4)	(5)
Net periodic benefit cost	$ 0	$ 0	$ 2	$ 1