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MERGER WITH PLUM CREEK Additional Information (Details) - Plum Creek [Member]
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Feb. 19, 2016
Business Acquisition [Line Items]            
Exchange ratio per the merger agreement           1.60
Total assets acquired $ 9,959   $ 9,959      
Estimated consideration transferred     6,383      
Total liabilities assumed 3,576   3,576      
Merger-related costs 14 $ 0 132 $ 0 $ 14  
Non-recurring merger-related costs $ 10 $ 0 $ 144 $ 0