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Supplementary Financial Statement Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Sep. 23, 2010
acre
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2010
Noncontrolling Interest [Line Items]        
Percentage of inventories valued using last-in, first-out inventory method   64.00%    
Increase in total inventory balances if first-in, first-out method had been used   $ 381 $ 350  
Forestlands sold, acres 163,000      
Proceeds from sale of timberlands 199      
Gain from sale of properties, pretax 50      
Gain from sale of properties, after tax 31      
Proceeds from Sale of Productive Assets 160      
Notes, loans and financing receivables, net       $ 39
Rock Creek Capital Partnership [Member]
       
Noncontrolling Interest [Line Items]        
Percentage of minority interest of new entity   20.00%