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MERGER WITH PLUM CREEK Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Plum Creek - USD ($)
$ in Millions
Dec. 31, 2016
Feb. 19, 2016
Business Acquisition [Line Items]    
Total assets acquired $ 10,000  
Total liabilities assumed 3,600  
Preliminary allocation    
Business Acquisition [Line Items]    
Current assets   $ 128
Timber and timberlands   8,124
Minerals and mineral rights   312
Property and equipment   272
Other assets   163
Total assets acquired   9,963
Current liabilities   610
Long-term debt   2,056
Note payable to Timberland Venture   837
Other liabilities   77
Total liabilities assumed   3,580
Net assets acquired   6,383
Preliminary allocation | Equity investment in Timberland Venture    
Business Acquisition [Line Items]    
Equity investments in joint ventures   876
Preliminary allocation | Equity investment in Real Estate Development Ventures    
Business Acquisition [Line Items]    
Equity investments in joint ventures   $ 88
Measurement period adjustments    
Business Acquisition [Line Items]    
Current assets 10  
Timber and timberlands 2  
Minerals and mineral rights 6  
Property and equipment 5  
Other assets 4  
Total assets acquired (5)  
Current liabilities 0  
Long-term debt 0  
Note payable to Timberland Venture 1  
Other liabilities (6)  
Total liabilities assumed (5)  
Net assets acquired 0  
Measurement period adjustments | Equity investment in Timberland Venture    
Business Acquisition [Line Items]    
Equity investments in joint ventures (29)  
Measurement period adjustments | Equity investment in Real Estate Development Ventures    
Business Acquisition [Line Items]    
Equity investments in joint ventures (3)  
Final allocation    
Business Acquisition [Line Items]    
Current assets 138  
Timber and timberlands 8,126  
Minerals and mineral rights 318  
Property and equipment 277  
Other assets 167  
Total assets acquired 9,958  
Current liabilities 610  
Long-term debt 2,056  
Note payable to Timberland Venture 838  
Other liabilities 71  
Total liabilities assumed 3,575  
Net assets acquired 6,383  
Final allocation | Equity investment in Timberland Venture    
Business Acquisition [Line Items]    
Equity investments in joint ventures 847  
Final allocation | Equity investment in Real Estate Development Ventures    
Business Acquisition [Line Items]    
Equity investments in joint ventures $ 85