PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 9	$ 9
Interest cost	32	33
Expected return on plan assets	(55)	(54)
Amortization of net (gain) loss	21	19
Net periodic benefit cost	7	7
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	2	2
Amortization of net (gain) loss	(1)	(2)
Net periodic benefit cost	$ 1	$ 0