PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 9	$ 11	$ 18	$ 22
Interest cost	33	41	66	82
Expected return on plan assets	(54)	(57)	(108)	(114)
Amortization of net (gain) loss	19	22	38	44
Net periodic benefit cost	7	17	14	34
Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Interest cost	2	3	4	6
Amortization of net (gain) loss	(1)	(3)	(3)	(6)
Net periodic benefit cost	$ 1	$ 0	$ 1	$ 0