PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)(2)	$ 0	$ 0	$ (151)
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	0	0	(3)
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	48	57	53
Interest cost	277	265	271
Expected return on plan assets	(495)	(476)	(467)
Amortization of actuarial loss	156	182	125
Amortization of prior service cost (credit)(2)	4	4	5
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	0	0	9
Change in control enhanced benefits	5	0
Other	0	0	0
Net periodic benefit cost (credit)	(5)	32	(4)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1
Interest cost	8	9	10
Expected return on plan assets	0	0	0
Amortization of actuarial loss	9	10	12
Amortization of prior service cost (credit)(2)	(7)	(9)	(161)
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)	0	0	0
Change in control enhanced benefits	0	0
Other	0	0	(4)
Net periodic benefit cost (credit)	10	10	(142)
Plum Creek | Pension
Defined Benefit Plan Disclosure [Line Items]
Change in control enhanced benefits	5	0	0
Plum Creek | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Change in control enhanced benefits	0	0	0
WRECO | Pension
Defined Benefit Plan Disclosure [Line Items]
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)			(9)
Discontinued operations | Cellulose Fibers | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 13	$ 17	11
Discontinued operations | WRECO | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost			2
Earnings from discontinued operations [Member] | WRECO | Pension
Defined Benefit Plan Disclosure [Line Items]
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)			(6)
Charges for restructuring, closures and impairments | WRECO | Pension
Defined Benefit Plan Disclosure [Line Items]
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(1)			$ (3)