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Fair Value Measurements (Narrative) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
PLUM CREEK TIMBER CO INC [Member] \| Trading Securities [Member]
Deferred Compensation Obligations Included in Other Liabilities	$ 5,000,000	$ 5,000,000
PLUM CREEK TIMBERLANDS L P [Member] \| Trading Securities [Member]
Deferred Compensation Obligations Included in Other Liabilities	5,000,000	5,000,000
PLUM CREEK TIMBER CO INC [Member]
Long-term Debt, Fair Value	2,900,000,000	2,830,000,000
Carrying Value of Company's Debt	2,698,000,000	2,686,000,000
PLUM CREEK TIMBERLANDS L P [Member]
Long-term Debt, Fair Value	1,990,000,000	1,950,000,000
Carrying Value of Company's Debt	$ 1,915,000,000	$ 1,903,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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