PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Feb. 19, 2016
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in fair value of plan assets		$ 7
Change in fair value of pension assets (%)		less than 1 percent
Increase (decrease) in fair value of plan benefit obligation		$ 1
Change in projected benefit obligation (%)		less than 1 percent
Increase (decrease) in funded status of plan		$ 6
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	$ 0			$ 0	$ 5	$ 0
Registered Canadian Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016					17
Non Registered Canadian Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016					3
U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2016					57
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]
Cumulative funded status of assumed plan							$ (62)
Accelerated pension costs included in Plum Creek merger-related costs (Note 15)	0		$ 5	$ 0	5	$ 0
Supplemental pension benefit payments	37
Plum Creek [Member] | U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Plan assets held in grantor trust	$ 47				47
Fair value of projected benefit obligation							50
Expected contribution to benefit plans during 2016					$ 38
Plum Creek [Member] | U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets					7.00%
Fair value of plan assets							137
Fair value of projected benefit obligation							$ 149