PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Feb. 19, 2016
Registered Canadian Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	$ 16
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	3
Pension
Defined Benefit Plan Disclosure [Line Items]
Accelerated pension costs included in Plum Creek merger-related costs	5	$ 0
U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	52
U.S. and Canadian Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	22
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016	0
Plum Creek [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	(62)
Accelerated pension costs included in Plum Creek merger-related costs	5	$ 0
Plum Creek [Member] | U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets held in grantor trust	47
Defined Benefit Plan, Benefit Obligation			$ 50
Expected contribution to benefit plans during 2016	$ 33
Plum Creek [Member] | U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.00%
Defined Benefit Plan, Fair Value of Plan Assets			137
Defined Benefit Plan, Benefit Obligation			$ 149