Consolidated Statements of Income (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest Expense, net:
Income from Continuing Operations			$ 82	$ 111
Gain on Sale of Properties, net of tax			0	11
Net Income	44	35	82	122
PER SHARE AMOUNTS:
Income from Continuing Operations - Basic			$ 0.51	$ 0.68
Income from Continuing Operations - Diluted			$ 0.50	$ 0.68
Net Income per Share-Basic	$ 0.27	$ 0.21	$ 0.51	$ 0.75
Net Income per Share-Diluted	$ 0.27	$ 0.21	$ 0.50	$ 0.75
Weighted-Average Number of Shares Outstanding
-Basic	162.0	162.3	161.9	162.6
-Diluted	162.3	162.5	162.2	162.8
PLUM CREEK TIMBER CO INC [Member]
REVENUES:
Timber	126	133	267	284
Real Estate	79	43	141	142
Manufacturing	74	78	141	138
Other	5	4	10	11
Total Revenues	284	258	559	575
COSTS AND EXPENSES:
Timber	101	100	208	209
Real Estate	27	16	49	51
Manufacturing	67	68	128	122
Other	1	1	1	1
Total Cost of Goods Sold	196	185	386	383
Selling, General and Administrative	25	21	53	50
Total Costs and Expenses	221	206	439	433
Other Operating Income (Expense), net	0	4	3	9
Operating Income	63	56	123	151
Equity Earnings from Timberland Venture	16	15	30	29
Interest Expense, net:
Interest Expense (Debt Obligations to Unrelated Parties)	20	19	41	39
Interest Expense (Note Payable to Timberland Venture)	15	15	29	29
Total Interest Expense, net	35	34	70	68
Income before Income Taxes	44	37	83	112
Provision (Benefit) for Income Taxes	0	2	1	1
Income from Continuing Operations			82	111
Gain on Sale of Properties, net of tax			0	11
Net Income	44	35	82	122
PER SHARE AMOUNTS:
Income from Continuing Operations - Basic			$ 0.51	$ 0.68
Income from Continuing Operations - Diluted			$ 0.50	$ 0.68
Net Income per Share-Basic	$ 0.27	$ 0.21	$ 0.51	$ 0.75
Net Income per Share-Diluted	$ 0.27	$ 0.21	$ 0.50	$ 0.75
Dividends Declared - per Common Share Outstanding	$ 0.42	$ 0.42	$ 0.84	$ 0.84
Weighted-Average Number of Shares Outstanding
-Basic	162.0	162.3	161.9	162.6
-Diluted	162.3	162.5	162.2	162.8
PLUM CREEK TIMBERLANDS L P [Member]
REVENUES:
Timber	126	133	267	284
Real Estate	79	43	141	142
Manufacturing	74	78	141	138
Other	5	4	10	11
Total Revenues	284	258	559	575
COSTS AND EXPENSES:
Timber	101	100	208	209
Real Estate	27	16	49	51
Manufacturing	67	68	128	122
Other	1	1	1	1
Total Cost of Goods Sold	196	185	386	383
Selling, General and Administrative	25	21	53	50
Total Costs and Expenses	221	206	439	433
Other Operating Income (Expense), net	0	4	3	9
Operating Income	63	56	123	151
Equity Earnings from Timberland Venture	16	15	30	29
Interest Expense, net:
Total Interest Expense, net	20	19	41	39
Income before Income Taxes	59	52	112	141
Provision (Benefit) for Income Taxes	0	2	1	1
Income from Continuing Operations			111	140
Gain on Sale of Properties, net of tax			0	11
Net Income before Allocation to Series T-1 Preferred Interest and Partners	59	50	111	151
Net Income Allocable to Series T-1 Preferred Interest	(15)	(15)	(29)	(29)
Net Income	$ 44	$ 35	$ 82	$ 122