PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Components of Net Periodic Benefit Costs (Credits) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)	$ 10	$ 13
Interest cost	66	68
Expected return on plan assets	(102)	(123)
Amortization of actuarial loss	55	38
Amortization of prior service cost (credit)	1	1
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0	5
Total net periodic benefit cost (credit)	30	2
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	2
Amortization of actuarial loss	2	2
Amortization of prior service cost (credit)	(2)	(2)
Total net periodic benefit cost (credit)	$ 2	2
Discontinued Operations [Member] | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost(1)		$ 4