CHARGES FOR INTEGRATION AND RESTRUCTURING, CLOSURES AND ASSET IMPAIRMENTS - Items Included in Our Charges for Integration and Restructuring, Closures and Asset Impairments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Charges for integration and restructuring, closures and asset impairments
Termination benefits	$ 14
Impairment of long-lived assets	154	$ 16	$ 15
Total charges for integration and restructuring, closures and asset impairments	194	170	39
Plum Creek
Charges for integration and restructuring, closures and asset impairments
Termination benefits	11	54	0
Acceleration of share-based compensation related to qualifying terminations (Note 16)	0	21	0
Acceleration of pension benefits related to qualifying terminations (Note 9)	0	5	0
Professional services	16	52	14
Other integration and restructuring costs	7	14	0
Total charges for integration and restructuring, closures and asset impairments	34	146	14
Other Closures and Restructuring
Charges for integration and restructuring, closures and asset impairments
Termination benefits	3	4	4
Other closures and restructuring costs	3	4	6
Total charges related to closures and other restructuring activities	$ 6	$ 8	$ 10