PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 9	$ 9	$ 18	$ 18
Interest cost	32	33	64	66
Expected return on plan assets	(55)	(54)	(110)	(108)
Amortization of net (gain) loss	21	19	42	38
Net periodic benefit cost	7	7	14	14
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	2	2	4	4
Amortization of net (gain) loss	(1)	(1)	(2)	(3)
Net periodic benefit cost	$ 1	$ 1	$ 2	$ 1