XML 24 R43.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Fair Value Measurements (Level 1 Assets Reported in the Company's Financial Statements at Fair Value, Measured on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Measurements, Recurring [Member]
       
Cash Equivalents $ 249 [1] $ 249 [1]    
Available-for-Sale Securities 33 [2] 30 [2]    
Trading Securities 5 [2] 5 [2]    
Total 287 284    
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Cash Equivalents 249 [1] 249 [1]    
Available-for-Sale Securities 33 [2] 30 [2]    
Trading Securities 5 [2] 5 [2]    
Investments, Fair Value Disclosure 287 284    
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Measurements, Recurring [Member]
       
Cash Equivalents 249 [1] 249 [1]    
Available-for-Sale Securities 33 [2] 30 [2]    
Trading Securities 5 [2] 5 [2]    
Total 287 284    
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Cash Equivalents 249 [1] 249 [1]    
Available-for-Sale Securities 33 [2] 30 [2]    
Trading Securities 5 [2] 5 [2]    
Investments, Fair Value Disclosure 287 284    
PLUM CREEK TIMBER CO INC [Member]
       
Cash and Cash Equivalents 253 252 250 299
Domestic Portion of Mutual Funds (percentage) 50.00%      
International Portion of Mutual Funds (percentage) 20.00%      
Debt Securities Portion of Mutual Funds (percentage) 30.00%      
PLUM CREEK TIMBERLANDS L P [Member]
       
Cash and Cash Equivalents $ 253 $ 252 $ 250 $ 299
Domestic Portion of Mutual Funds (percentage) 50.00%      
International Portion of Mutual Funds (percentage) 20.00%      
Debt Securities Portion of Mutual Funds (percentage) 30.00%      
[1] Consists of several money market funds and is included in the $253 million and $252 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at June 30, 2011 and December 31, 2010, respectively.
[2] Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at June 30, 2011 and December 31, 2010. At June 30, 2011, investments in these mutual funds were approximately 50% in domestic (U.S.) equities, 20% in international equities and 30% in debt securities.