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MERGER WITH PLUM CREEK Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Plum Creek [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Feb. 19, 2016
Business Acquisition [Line Items]    
Total assets acquired $ 9,959  
Total liabilities assumed 3,576  
Scenario, Previously Reported [Member]    
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
Scenario, Previously Reported [Member] | Timberland Venture [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures   876
Scenario, Previously Reported [Member] | Real Estate Development Ventures [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures   $ 88
Measurement period adjustments [Member]    
Business Acquisition [Line Items]    
Current assets 1  
Timber and timberlands 23  
Minerals and mineral rights 4  
Property and equipment 5  
Other assets (4)  
Total assets acquired (4)  
Current liabilities 0  
Long-term debt 0  
Note Payable to Timberland Venture 1  
Other liabilities (5)  
Total liabilities assumed (4)  
Net assets acquired 0  
Measurement period adjustments [Member] | Timberland Venture [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures (29)  
Measurement period adjustments [Member] | Real Estate Development Ventures [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures (4)  
Updated valuation [Member]    
Business Acquisition [Line Items]    
Current assets 129  
Timber and timberlands 8,147  
Minerals and mineral rights 316  
Property and equipment 277  
Other assets 159  
Current liabilities 610  
Long-term debt 2,056  
Note Payable to Timberland Venture 838  
Other liabilities 72  
Net assets acquired 6,383  
Updated valuation [Member] | Timberland Venture [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures 847  
Updated valuation [Member] | Real Estate Development Ventures [Member]    
Business Acquisition [Line Items]    
Equity Investments in Joint Ventures $ 84