Consolidated Balance Sheets (USD $) In Millions	Jun. 30, 2011 PLUM CREEK TIMBER CO INC [Member]	Dec. 31, 2010 PLUM CREEK TIMBER CO INC [Member]	Jun. 30, 2011 PLUM CREEK TIMBERLANDS L P [Member]	Mar. 31, 2011 PLUM CREEK TIMBERLANDS L P [Member]	Dec. 31, 2010 PLUM CREEK TIMBERLANDS L P [Member]
Current Assets:
Cash and Cash Equivalents	$ 253	$ 252	$ 253		$ 252
Accounts Receivable	33	21	33		21
Like-Kind Exchange Funds Held in Escrow	35	0	35		0
Inventories	43	49	43		49
Deferred Tax Asset	7	7	7		7
Assets Held for Sale	39	57	39		57
Other Current Assets	16	24	16		24
Total Current Assets	426	410	426		410
Timber and Timberlands, net	3,383	3,405	3,383		3,405
Property, Plant and Equipment, net	142	146	142		146
Equity Investment in Timberland Venture	203	201	203		201
Deferred Tax Asset	6	10	6		10
Investment in Grantor Trusts (at Fair Value)	38	35	39		36
Other Assets	42	44	42		44
Total Assets	4,240	4,251	4,241		4,252
Current Liabilities:
Current Portion of Long-Term Debt	395	94	395		94
Line of Credit	227	166	227		166
Accounts Payable	31	25	31		25
Interest Payable	26	23	19		16
Wages Payable	12	23	12		23
Taxes Payable	14	12	14		12
Deferred Revenue	36	25	36		25
Other Current Liabilities	8	7	8		7
Total Current Liabilities	749	375	742		368
Long-Term Debt	1,293	1,643	1,293		1,643
Note Payable to Timberland Venture	783	783
Other Liabilities	81	76	82		77
Total Liabilities	2,906	2,877	2,117		2,088
Commitments and Contingencies
Stockholders' Equity
Preferred Stock, $0.01 Par Value, Authorized Shares - 75.0, Outstanding - None	0	0
Common Stock, $0.01 Par Value, Authorized Shares - 300.6, Outstanding (net of Treasury Stock) - 162.0 at June 30, 2011 and 161.6 at December 31, 2010	2	2
Additional Paid-In Capital	2,256	2,243
Retained Earnings (Accumulated Deficit)	(3)	51
Treasury Stock, at Cost, Common Shares - 26.2 at June 30, 2011 and 26.2 at December 31, 2010	(912)	(911)
Accumulated Other Comprehensive Income (Loss)	(9)	(11)
Total Stockholders' Equity	1,334	1,374
Total Liabilities and Stockholders' Equity	4,240	4,251
PARTNERSHIP CAPITAL
Series T-1 Preferred Interest			790		790
Partners' Capital (Common Partnership Interests)			1,334		1,374
Total Partnership Capital			2,124	2,143	2,164
Total Liabilities and Partnership Capital			$ 4,241		$ 4,252