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ACQUISITIONS - Additional Information (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Nov. 30, 2015
shares
Nov. 06, 2015
$ / shares
Jul. 08, 2013
USD ($)
$ / shares
shares
Jun. 24, 2013
USD ($)
$ / shares
shares
Sep. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
shares
Jul. 23, 2013
a
Rate
Business Acquisition [Line Items]                  
Acquisition of Longview Timber LLC, net of cash acquired           $ 0 $ 0 $ 1,581  
Acquisition of Longview Timber LLC, debt assumed           $ 0 $ 0 $ 1,070  
New shares issued | shares           0 0 33,350  
Net proceeds from issuance of common shares           $ 0 $ 0 $ 897  
Fees related to bridge loan               $ 11  
Common shares:                  
Business Acquisition [Line Items]                  
New shares issued | shares     4,400 29,000          
Valuation date closing stock price | $ / shares     $ 27.75 $ 27.75          
Net proceeds from issuance of common shares     $ 116 $ 781          
6.375 percent Mandatory Convertible Preference Shares, Series A                  
Business Acquisition [Line Items]                  
New shares issued | shares       13,800          
Preference shares, par value | $ / shares       $ 1.00   $ 1.00 $ 1.00    
Preference shares, liquidation preference | $ / shares       $ 50.00   $ 50.00 $ 50.00    
Net proceeds from issuance of preference shares       $ 669          
Plum Creek Timber Company, Inc. [Member]                  
Business Acquisition [Line Items]                  
Equity shares issued or issuable conversion ratio | $ / shares   $ 1.60              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares 278,000                
Longview Timber LLC [Member]                  
Business Acquisition [Line Items]                  
Acquisition of Longview Timber LLC, effective date of acquisition         Jul. 23, 2013        
Acquisition of Longview Timber LLC, equity interests purchased | Rate                 100.00%
Acquisition of Longview Timber LLC, net of cash acquired         $ 1,580        
Acquisition of Longview Timber LLC, debt assumed         1,070        
Acquisition of Longview Timber LLC, aggregate purchase price         $ 2,650        
Acquisition of Longview Timber LLC, timberlands acquired, acres | a                 645,000