CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS Items Included in Our Integration and Restructuring, Closure and Asset Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Charges related to integration and restructuring
Termination benefits				$ 56
Impairments of long-lived assets	$ 0		$ 1	2	$ 14
Total charges for integration and restructuring, closures and impairments	16		2	141	16
Plum Creek [Member]
Charges related to integration and restructuring
Termination benefits	4		0	52	0
Acceleration of share-based compensation related to qualifying terminations (Note 14)	0		0	21	0
Acceleration of pension benefits related to qualifying terminations (Note 8)	0	$ 5	0	5	0
Professional services	6		0	45	0
Other integration and restructuring costs	4		0	9	0
Total integration and restructuring charges related to our merger with Plum Creek	14		0	132	0	$ 14
Discontinued operations
Charges related to integration and restructuring
Termination benefits	1		0	4	1
Other closures and restructuring costs	1		1	3	1
Total charges for integration and restructuring, closures and impairments	$ 2		$ 1	$ 7	$ 2