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MERGER WITH PLUM CREEK Additional Information (Details) - Plum Creek - USD ($)
$ in Millions
3 Months Ended
Feb. 19, 2016
Mar. 31, 2016
Business Acquisition [Line Items]    
Total assets acquired $ 10,000  
Consideration transferred 6,400  
Total liabilities assumed $ 3,600  
Non-recurring merger-related costs   $ 131