PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Components of Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 7	$ 11	$ 17	$ 24
Interest cost	66	69	132	137
Expected return on plan assets	(103)	(123)	(205)	(246)
Amortization of actuarial loss	42	40	97	78
Amortization of prior service cost (credit)	1	1	2	2
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0	0	0	5
Total net periodic benefit cost (credit)	13	(2)	43	0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	3	4	5
Amortization of actuarial loss	2	2	4	4
Amortization of prior service cost (credit)	(2)	(2)	(4)	(4)
Total net periodic benefit cost (credit)	$ 2	3	$ 4	5
Discontinued Operations [Member] | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)		$ 3		$ 7