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MERGER WITH PLUM CREEK Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Plum Creek [Member]
$ in Millions
Feb. 19, 2016
USD ($)
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
Timberland Venture [Member]  
Business Acquisition [Line Items]  
Equity Investments in Joint Ventures 876
Real Estate Development Ventures [Member]  
Business Acquisition [Line Items]  
Equity Investments in Joint Ventures $ 88