Plum Creek Timber (PCL) 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	PLUM CREEK TIMBER CO INC
Entity Central Index Key	849213
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$6,924,257,143
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		176,059,055
Entity Well-known Seasoned Issuer	Yes
PLUM CREEK TIMBERLANDS L P [Member]
Entity Information [Line Items]
Entity Registrant Name	Plum Creek Timberlands LP
Entity Central Index Key	1296350
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense, net:
Net Income	$214	$214	$203
PER SHARE AMOUNTS:
Net Income per Share-Basic	$1.21	$1.30	$1.25
Net Income per Share-Diluted	$1.21	$1.30	$1.25
Weighted-Average Number of Shares Outstanding
-Basic	176.7	164.6	161.5
-Diluted	177	165	161.9
PLUM CREEK TIMBER CO INC [Member]
REVENUES:
Timber	767	669	641
Real Estate	289	286	352
Manufacturing	368	362	324
Energy and Natural Resources	34	23	22
Other	18	0	0
Total Revenues	1,476	1,340	1,339
COSTS AND EXPENSES:
Timber	555	495	498
Real Estate	151	110	157
Manufacturing	322	310	286
Energy and Natural Resources	10	5	2
Other	16	0	0
Total Cost of Goods Sold	1,054	920	943
Selling, General and Administrative	115	123	116
Total Costs and Expenses	1,169	1,043	1,059
Other Operating Income (Expense), Net	15	-2	1
Operating Income (Loss)	322	295	281
Earnings from Unconsolidated Entities	66	63	59
Interest Expense, net:
Interest Expense (Debt Obligations to Unrelated Parties)	108	83	82
Interest Expense (Note Payable to Timberland Venture)	58	58	58
Total Interest Expense, net	166	141	140
Loss on Extinguishment of Debt	0	-4	0
Income before Income Taxes	222	213	200
Provision (Benefit) for Income Taxes	8	-1	-3
Net Income	214	214	203
PER SHARE AMOUNTS:
Net Income per Share-Basic	$1.21	$1.30	$1.25
Net Income per Share-Diluted	$1.21	$1.30	$1.25
Weighted-Average Number of Shares Outstanding
-Basic	176.7	164.6	161.5
-Diluted	177	165	161.9
PLUM CREEK TIMBERLANDS L P [Member]
REVENUES:
Timber	767	669	641
Real Estate	289	286	352
Manufacturing	368	362	324
Energy and Natural Resources	34	23	22
Other	18	0	0
Total Revenues	1,476	1,340	1,339
COSTS AND EXPENSES:
Timber	555	495	498
Real Estate	151	110	157
Manufacturing	322	310	286
Energy and Natural Resources	10	5	2
Other	16	0	0
Total Cost of Goods Sold	1,054	920	943
Selling, General and Administrative	115	123	116
Total Costs and Expenses	1,169	1,043	1,059
Other Operating Income (Expense), Net	15	-2	1
Operating Income (Loss)	322	295	281
Earnings from Unconsolidated Entities	66	63	59
Interest Expense, net:
Total Interest Expense, net	108	83	82
Loss on Extinguishment of Debt	0	-4	0
Income before Income Taxes	280	271	258
Provision (Benefit) for Income Taxes	8	-1	-3
Net Income before Allocation to Series T-1 Preferred Interest and Partners	272	272	261
Net Income Allocable to Series T-1 Preferred Interest	-58	-58	-58
Net Income	214	214	203
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	63	63	59
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	63	63	59
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	3	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	$3	$0	$0

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income	$214	$214	$203
PLUM CREEK TIMBER CO INC [Member]
Net Income	214	214	203
Defined Benefit Pension Plans [Abstract]
Actuarial Gain/(Loss)	-34	25	-2
Amortization of the Net Actuarial Gain or Loss	2	5	4
Unrealized Gains (Losses) on Grantor Trust Assets [Abstract]
Unrealized Holding Gains (Losses)	1	5	2
Less: Reclassification to Net Income for Realized Gains or Losses	0	0	0
Derivative Instruments [Abstract]
Gain (Loss) on Cash Flow Hedge	0	5	0
Less: Amortization of Gain Reclassified to Interest Expense	0	0	0
Other Comprehensive Income (Loss) Before Tax	-31	40	4
Other Comprehensive Income (Loss), Tax	-7	7	1
Other Comprehensive Income (Loss), Net of Tax	-24	33	3
Total Comprehensive Income	190	247	206
PLUM CREEK TIMBERLANDS L P [Member]
Net Income	214	214	203
Net Income before Allocation to Series T-1 Preferred Interest and Partners	272	272	261
Defined Benefit Pension Plans [Abstract]
Actuarial Gain/(Loss)	-34	25	-2
Amortization of the Net Actuarial Gain or Loss	2	5	4
Unrealized Gains (Losses) on Grantor Trust Assets [Abstract]
Unrealized Holding Gains (Losses)	1	5	2
Less: Reclassification to Net Income for Realized Gains or Losses	0	0	0
Derivative Instruments [Abstract]
Gain (Loss) on Cash Flow Hedge	0	5	0
Less: Amortization of Gain Reclassified to Interest Expense	0	0	0
Other Comprehensive Income (Loss) Before Tax	-31	40	4
Other Comprehensive Income (Loss), Tax	-7	7	1
Other Comprehensive Income (Loss), Net of Tax	-24	33	3
Total Comprehensive Income	$248	$305	$264

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Assets
Cash and Cash Equivalents	$92	$433	$356
Accounts Receivable	38	29
Inventories	61	55
Deferred Tax Asset	6	9
Assets Held for Sale	98	92
Other Current Assets	15	15
Total Current Assets	310	633
Timber and Timberlands, net	4,009	4,180
Minerals and Mineral Rights, net	289	298
Property, Plant and Equipment, net	120	118
Equity Investment in Timberland Venture	217	211
Equity Investment in Real Estate Development Ventures	126	139
Deferred Tax Asset	23	17
Investment in Grantor Trusts (at Fair Value)	48	45
Other Assets	45	54
Total Assets	5,187	5,695
Liabilities
Current Portion of Long-Term Debt	439	0
Line of Credit	95	467
Accounts Payable	27	24
Interest Payable	22	22
Wages Payable	31	29
Taxes Payable	10	10
Deferred Revenue	23	26
Other Current Liabilities	10	10
Total Current Liabilities	657	588
Long-Term Debt	1,976	2,414
Note Payable to Timberland Venture	783	783
Other Liabilities	100	78
Total Liabilities	3,516	3,863
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) - 175.9 at December 31, 2014 and 177.0 at December 31, 2013	2	2
Additional Paid-In Capital	2,955	2,942
Retained Earnings (Accumulated Deficit)	-271	-173
Treasury Stock, at Cost, Common Shares - 28.3 at December 31, 2014 and 27.0 at December 31, 2013	-992	-940
Accumulated Other Comprehensive Income (Loss)	-23	1	-32
Total Stockholders' Equity	1,671	1,832	1,223
Total Liabilities and Stockholders' Equity	5,187	5,695
PLUM CREEK TIMBERLANDS L P [Member]
Assets
Cash and Cash Equivalents	92	433	356
Accounts Receivable	38	29
Inventories	61	55
Deferred Tax Asset	6	9
Assets Held for Sale	98	92
Other Current Assets	15	15
Total Current Assets	310	633
Timber and Timberlands, net	4,009	4,180
Minerals and Mineral Rights, net	289	298
Property, Plant and Equipment, net	120	118
Equity Investment in Timberland Venture	217	211
Equity Investment in Real Estate Development Ventures	126	139
Deferred Tax Asset	23	17
Investment in Grantor Trusts (at Fair Value)	49	46
Other Assets	45	54
Total Assets	5,188	5,696
Liabilities
Current Portion of Long-Term Debt	439	0
Line of Credit	95	467
Accounts Payable	27	24
Interest Payable	15	15
Wages Payable	31	29
Taxes Payable	10	10
Deferred Revenue	23	26
Other Current Liabilities	10	10
Total Current Liabilities	650	581
Long-Term Debt	1,976	2,414
Other Liabilities	101	79
Total Liabilities	2,727	3,074
Commitments and Contingencies
Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)	-23	1	-32
PARTNERSHIP CAPITAL
Series T-1 Preferred Interest	790	790
Partners' Capital (Common Partnership Interests)	1,671	1,832
Total Partnership Capital	2,461	2,622	2,013
Total Liabilities and Partnership Capital	$5,188	$5,696

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	75,000,000	75,000,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	300,634,566	300,600,000
Common Stock, Shares, Outstanding	175,900,000	177,000,000
Treasury Stock, Shares	28,300,000	27,000,000
PLUM CREEK TIMBERLANDS L P [Member]
Other Marketable Securities Noncurrent Fair Value	$48	$45

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholder's Equity and Other Comprehensive Income (USD $)	Total	PLUM CREEK TIMBER CO INC [Member]		PLUM CREEK TIMBER CO INC [Member]	PLUM CREEK TIMBER CO INC [Member]	PLUM CREEK TIMBER CO INC [Member]	PLUM CREEK TIMBER CO INC [Member]	PLUM CREEK TIMBER CO INC [Member]	PLUM CREEK TIMBERLANDS L P [Member]		PLUM CREEK TIMBERLANDS L P [Member]	PLUM CREEK TIMBERLANDS L P [Member]	PLUM CREEK TIMBERLANDS L P [Member]
In Millions, except Share data				Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]			Preferred Partnership Interest [Member]	Common Partners' Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2011									$2,053		$790	$1,298	($35)
Beginning Balance at Dec. 31, 2011		1,263		2	2,261	-28	-937	-35
Beginning Balance Shares at Dec. 31, 2011				161,300,000
Net Income before Allocation to Series T-1 Preferred Interest and Partners									261			261
Net Income	203	203				203			203
Other Comprehensive Income (Loss), Net of Tax		3						3	3				3
Dividends		-272				-272
Stock Option Exercises (Shares)				600,000
Stock Option Exercises		18		0	18
Tax Benefit from Stock Incentive Plans		0							0
Shares Issued under Stock Incentive Plans (Shares)				100,000
Shares Issued under Stock Incentive Plans		0		0	0
Share-based Compensation		9			9
Common Stock Repurchased (Shares)				0
Common Stock Repurchased		-1		0			-1
Net Income Allocation to Series T-1 Preferred Interest									0		58	-58
Distributions to Partners (Common Partnership Interests)									-255			-255
Distributions for Series T-1 Preferred Interest									-58		-58
Capital Contributions from Parent									9			9
Ending Balance at Dec. 31, 2012									2,013		790	1,255	-32
Ending Balance at Dec. 31, 2012		1,223		2	2,288	-97	-938	-32
Ending Balance Shares at Dec. 31, 2012				162,000,000
Net Income		56							56
Ending Balance at Mar. 31, 2013
Beginning Balance at Dec. 31, 2012									2,013		790	1,255	-32
Beginning Balance at Dec. 31, 2012		1,223		2	2,288	-97	-938	-32
Beginning Balance Shares at Dec. 31, 2012				162,000,000
Net Income before Allocation to Series T-1 Preferred Interest and Partners									272			272
Net Income	214	214				214			214
Other Comprehensive Income (Loss), Net of Tax		33						33	33				33
Dividends		-290				-290
Stock Option Exercises (Shares)				1,000,000
Stock Option Exercises		37		0	37
Tax Benefit from Stock Incentive Plans		1			1				1
Shares Issued under Stock Incentive Plans (Shares)				100,000
Shares Issued under Stock Incentive Plans		0		0	0
Share-based Compensation		9			9
Issuance of Common Stock (Shares)		13,915,000		13,900,000
Issuance of Common Stock		607		0	607
Common Stock Repurchased (Shares)				0
Common Stock Repurchased		-2		0			-2
Net Income Allocation to Series T-1 Preferred Interest									0		58	-58
Distributions to Partners (Common Partnership Interests)									-255			-255
Distributions for Series T-1 Preferred Interest									-58		-58
Capital Contributions from Parent									617			617
Ending Balance at Dec. 31, 2013									2,622		790	1,831	1
Ending Balance at Dec. 31, 2013		1,832		2	2,942	-173	-940	1
Ending Balance Shares at Dec. 31, 2013		177,000,000		177,000,000
Beginning Balance at Sep. 30, 2013
Net Income		40	[1]						40	[2]
Ending Balance at Dec. 31, 2013									2,622
Ending Balance at Dec. 31, 2013		1,832
Ending Balance Shares at Dec. 31, 2013		177,000,000
Net Income		30							30
Ending Balance at Mar. 31, 2014
Beginning Balance at Dec. 31, 2013									2,622		790	1,831	1
Beginning Balance at Dec. 31, 2013		1,832		2	2,942	-173	-940	1
Beginning Balance Shares at Dec. 31, 2013		177,000,000		177,000,000
Net Income before Allocation to Series T-1 Preferred Interest and Partners									272			272
Net Income	214	214				214			214
Other Comprehensive Income (Loss), Net of Tax		-24						-24	-24				-24
Dividends		-312				-312
Stock Option Exercises (Shares)				100,000
Stock Option Exercises		3		0	3
Tax Benefit from Stock Incentive Plans		0							0
Shares Issued under Stock Incentive Plans (Shares)				100,000
Shares Issued under Stock Incentive Plans		0		0	0
Share-based Compensation		10			10
Common Stock Repurchased (Shares)		-1,200,000		-1,300,000
Common Stock Repurchased		-52		0			-52
Net Income Allocation to Series T-1 Preferred Interest									0		58	-58
Distributions to Partners (Common Partnership Interests)									-361			-361
Distributions for Series T-1 Preferred Interest									-58		-58
Capital Contributions from Parent									10			10
Ending Balance at Dec. 31, 2014									2,461		790	1,694	-23
Ending Balance at Dec. 31, 2014		1,671		2	2,955	-271	-992	-23
Ending Balance Shares at Dec. 31, 2014		175,900,000		175,900,000
Beginning Balance at Sep. 30, 2014
Net Income		68							68
Ending Balance at Dec. 31, 2014									2,461
Ending Balance at Dec. 31, 2014		$1,671
Ending Balance Shares at Dec. 31, 2014		175,900,000
[1]	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.
[2]	During the fourth quarter of 2013, the Operating Partnership prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 9 of the Notes to Consolidated Financial Statements.

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$214	$214	$203
PLUM CREEK TIMBER CO INC [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	214	214	203
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization (Includes $2 MDF Fire Impairment Loss in 2014 and $4 Loss Related to Forest Fires in 2013)	138	119	114
Basis of Real Estate Sold	129	91	138
Earnings from Unconsolidated Entities	-66	-63	-59
Distributions from Timberland Venture	57	56	56
Distributions from Real Estate Development Ventures	2	0	0
Deferred Income Taxes	4	-3	-3
Loss on Extinguishment of Debt	0	4	0
Timber Deed Acquired	0	-18	-98
Pension Plan Contributions	-9	0	-20
Working Capital Changes	-11	-17	15
Other	-1	21	7
Net Cash Provided By (Used In) Operating Activities	457	404	353
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures, Excluding Timberland Acquisitions (Includes $12 MDF Replacement Capital in 2014)	-89	-71	-72
Timberlands Acquired	0	-81	-18
Minerals and Mineral Rights Acquired	0	-156	-76
Contributions to Real Estate Development Ventures	-9	0	0
Distributions from Real Estate Development Ventures	23	0	0
Insurance Recoveries (Property Damage)	10	0	0
Payment for Acquisition of MeadWestvaco Timberland Assets, net	0	-221	0
Purchases of Marketable Securities	-1	0	0
Other	1	0	-1
Net Cash Provided By (Used In) Investing Activities	-65	-529	-167
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends	-312	-290	-272
Borrowings on Line of Credit	1,307	1,771	1,843
Repayments on Line of Credit	-1,679	-1,408	-2,087
Proceeds from Issuance of Long-term Debt	0	0	773
Debt Issuance Costs	0	-1	-5
Principal Payments and Retirement of Long-Term Debt	0	-513	-353
Proceeds from Stock Option Exercises	3	37	18
Acquisition of Treasury Stock	-52	-2	-1
Proceeds from Issuance of Common Stock, net	0	607	0
Other	0	1	0
Net Cash Provided By (Used In) Financing Activities	-733	202	-84
Increase (Decrease) In Cash and Cash Equivalents	-341	77	102
Cash and Cash Equivalents:
Beginning of Period	433	356	254
End of Period	92	433	356
Supplemental Cash Flow Information [Abstract]
Interest - Debt Obligations To Unrelated Parties	109	84	79
Interest - Note Payable to Timberland Venture	58	58	58
Interest	167	142	137
Income Taxes - Net	5	-1	0
Issuance of Note Payable to MWV as Consideration for Timberland Assets Acquired	0	860	0
PLUM CREEK TIMBERLANDS L P [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	214	214	203
Net Income before Allocation to Series T-1 Preferred Interest and Partners	272	272	261
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization (Includes $2 MDF Fire Impairment Loss in 2014 and $4 Loss Related to Forest Fires in 2013)	138	119	114
Basis of Real Estate Sold	129	91	138
Earnings from Unconsolidated Entities	-66	-63	-59
Distributions from Timberland Venture	57	56	56
Distributions from Real Estate Development Ventures	2	0	0
Deferred Income Taxes	4	-3	-3
Loss on Extinguishment of Debt	0	4	0
Timber Deed Acquired	0	-18	-98
Pension Plan Contributions	-9	0	-20
Working Capital Changes	-11	-17	15
Other	-1	21	7
Net Cash Provided By (Used In) Operating Activities	515	462	411
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures, Excluding Timberland Acquisitions (Includes $12 MDF Replacement Capital in 2014)	-89	-71	-72
Timberlands Acquired	0	-81	-18
Minerals and Mineral Rights Acquired	0	-156	-76
Contributions to Real Estate Development Ventures	-9	0	0
Distributions from Real Estate Development Ventures	23	0	0
Insurance Recoveries (Property Damage)	10	0	0
Payment for Acquisition of MeadWestvaco Timberland Assets, net	0	-221	0
Purchases of Marketable Securities	-1	0	0
Other	1	0	-1
Net Cash Provided By (Used In) Investing Activities	-65	-529	-167
CASH FLOWS FROM FINANCING ACTIVITIES
Cash Distributions to Common Partners	-361	-255	-255
Cash Distributions for Series T-1 Preferred Interest	-58	-58	-58
Borrowings on Line of Credit	1,307	1,771	1,843
Repayments on Line of Credit	-1,679	-1,408	-2,087
Proceeds from Issuance of Long-term Debt	0	0	773
Debt Issuance Costs	0	-1	-5
Principal Payments and Retirement of Long-Term Debt	0	-513	-353
Capital Contributions from Parent	0	607	0
Other	0	1	0
Net Cash Provided By (Used In) Financing Activities	-791	144	-142
Increase (Decrease) In Cash and Cash Equivalents	-341	77	102
Cash and Cash Equivalents:
Beginning of Period	433	356	254
End of Period	92	433	356
Supplemental Cash Flow Information [Abstract]
Interest	109	84	79
Income Taxes - Net	5	-1	0
Issuance of Note Payable to MWV as Consideration for Timberland Assets Acquired	$0	$860	$0

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (Parenthetical) (Parentheticals) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss	$2
MDF Replacement Capital	12
PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss	2
MDF Replacement Capital	$12

Accounting_Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Accounting Policies	ACCOUNTING POLICIES
	General. Plum Creek Timber Company, Inc. (“Plum Creek,” “the company,” “we,” “us,” or “our”), a Delaware Corporation, is a real estate investment trust, or “REIT”, for federal income tax purposes. Plum Creek Timber Company, Inc. is also the parent company of its wholly-owned subsidiary Plum Creek Timberlands, L.P. (“the Partnership”), a Delaware Limited Partnership. At December 31, 2014, the company owned and managed approximately 6.6 million acres of timberlands in the Northwest, Southern and Northeast United States, and owned seven wood product conversion facilities in the Northwest United States. Included in the 6.6 million acres are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the company has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
	Basis of Presentation. The consolidated financial statements of the company include the accounts of Plum Creek Timber Company, Inc. and its subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. All transactions are denominated in United States dollars.
	Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Customer Concentrations. Annual revenues from the company’s largest customer accounted for 7% of total annual revenues in 2014, 2013, and 2012. If market conditions for wood products were to deteriorate, the loss of this customer could have a significant effect on the company’s results of operations.
	Product Concentrations. Sales of the company’s timber and wood products are dependent upon the economic conditions of the housing, repair and remodeling, industrial, and pulp and paper industries. Sales of the company’s timberlands are dependent upon the general economic conditions in the United States, interest rates and the availability of buyer financing from financial institutions, not-for-profit organizations and government sources. As a result of these product concentrations, a prolonged decline in these markets could have a significant impact on the company’s results of operations.
	Revenue Recognition.
	Resources Revenue. Timber sales revenues are recognized when legal ownership and the risk of loss transfers to the purchaser and the quantity sold is determinable. The company sells timber under delivered log agreements as well as through sales of standing timber (or “stumpage”). For delivered sales, revenue, which includes amounts billed for shipping and handling (logging and hauling of timber), is recognized when the log is delivered to the customer. Stumpage is sold using pay-as-cut or, less frequently, using timber deed sale agreements. Under a pay-as-cut sales contract, the purchaser acquires the right to harvest specified timber on a tract, at an agreed upon price per unit. The sale and any related advances are recognized as revenue as the purchaser harvests the timber on the tract. Under a timber deed sale, the buyer agrees to purchase and harvest specified timber on a tract of land over the term of the contract (usually 18 months or less). Unlike a pay-as-cut sales contract, risk of loss and title to the trees transfer to the buyer when the contract is signed. The buyer also pays the full purchase price when the contract is signed. Revenue from a timber deed sale is recognized when the contract is signed.
	Manufacturing Revenue. Revenues generated from the sale of lumber, plywood, medium density fiberboard (“MDF”) and related by-products (primarily wood chips), and amounts billed for shipping and handling are recognized at the time of delivery.
	Real Estate Revenue. Revenue from the sale of real estate is recognized when the sale has been consummated, the buyer’s initial and ongoing payments are adequate, the risks and rewards of owning the property have transferred to the buyer, and the company has no continuing involvement with the property. For all of our real estate sales, the company receives the entire consideration in cash at closing. Also at closing, the risks and rewards of ownership transfer to the buyer and the company does not have a continuing involvement in our properties after they are sold. Therefore, real estate revenue is recognized at closing.
	Revenue from real estate development projects is generally recognized under the full accrual method of accounting because sales generally do not commence until the project is completed. Broker commissions and closing costs of our Real Estate Segment are included in Cost of Goods Sold.
	The company will occasionally sell timberlands to a single buyer under a multi-period contract covering a series of prescheduled closings and/or options. Under these multi-period contracts, once title and risk of loss have transferred to the buyer for individual properties, the properties sold cannot be returned for a refund. However, deposits for future closings under multi-period contracts may be refunded under certain circumstances. The company treats each closing under a multi-period arrangement as a separate sale. Revenue in connection with a multi-period contract is generally recognized at closing equal to the lesser of the non-refundable consideration received or an allocation of total consideration based on fair value.
	Revenue generated from real estate sales includes the sale of higher value timberlands, non-strategic timberlands and large blocks of timberlands. In some of these transactions, the company sells timberlands that qualify for like-kind (tax-deferred) exchange treatment under the Internal Revenue Code. Substantially all of these sales involve a third party intermediary, whereby the third party intermediary receives proceeds related to the property sold and then reinvests the proceeds in like-kind property. The proceeds are recorded as revenue when the third party intermediary receives them. See “Like-Kind Exchanges”.
	Energy and Natural Resources Revenue. Overriding royalties earned in connection with aggregate mineral rights are recognized as revenue when the underlying aggregates are sold and the company is entitled to its share of the gross selling price. Additionally, royalties from aggregates leases and oil and gas leases are recognized as revenue when the underlying minerals are sold and the company is entitled to its share of the gross selling price. Generally, the mineral owners and lessees make payments to the company based on a percentage of the gross sales price of the minerals they sell. For overriding royalty and lease agreements with varying royalty percentages, revenue recognition is based on the relative-selling-price method, which may result in the deferral of revenue to future periods.
	Also, included within oil and gas royalties are lease bonus payments, which are typically paid upon the execution of a lease. Lease bonus payments are initially recorded as deferred revenue and are generally recognized as revenue over the period the lessee is entitled to explore for oil and gas. Certain of the company’s leases are also subject to minimum annual payments. In some cases, lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is also recognized as revenue upon the expiration of the lessee’s ability to recoup the payments.
	Cash and Cash Equivalents. All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents. Substantially all of the cash and cash equivalents are invested in money market funds.
	Accounts Receivable.  Accounts receivable is presented net of an allowance for doubtful accounts of $0.2 million at both December 31, 2014 and December 31, 2013. Accounts are deemed past due based on payment terms. The allowance for doubtful accounts represents management’s estimate and is based on historical losses, recent collection history, credit ratings of individual customers and existing economic conditions. Delinquent accounts are charged against the allowance for doubtful accounts to the extent and at the time they are deemed uncollectible.
	Like-Kind Exchanges. Plum Creek may enter into like-kind (tax-deferred) exchange transactions to acquire and sell assets, principally timberlands. These transactions may include both forward (timberlands sold, followed by reinvestment of proceeds to acquire timberlands) and reverse (timberlands purchased, followed by receipt of proceeds from timberland sales) like-kind exchanges. The company uses a qualified escrow and/or trust account to facilitate like-kind exchange transactions. Funds from forward like-kind exchange transactions are restricted from being used until the funds are either successfully reinvested in timber and timberlands or the exchange fails and the proceeds are distributed to the company.
	Inventories. Logs, work-in-process and finished goods are stated at the lower of cost or market using the average cost method. A separate lower of cost or market analysis is prepared for each product line (i.e. lumber, plywood and MDF). Net realizable value is determined based on actual selling prices at the end of the accounting period. Losses on firm purchase commitments for logs are recorded when the related manufactured finished products are expected to be sold at a loss based on current product prices. Supplies inventories are stated at cost. Costs for manufactured inventories include raw materials, labor, supplies, energy, depreciation and production overhead. Cost of log inventories include timber depletion, stumpage, associated logging and harvesting costs, road costs and production overhead.
	Timber and Timberlands. Timber (including timber deeds and logging roads) and timberlands are stated at cost less accumulated depletion for timber previously harvested and accumulated road amortization. The company capitalizes timber and timberland purchases along with reforestation costs and other costs associated with the planting and growing of timber, such as site preparation, growing or purchases of seedlings, planting, fertilization, herbicide application and the thinning of tree stands to improve growth. The company presents timber and timberland purchases and the capitalized costs described above under Investing Activities on the Consolidated Statements of Cash Flows. A timber deed, also called timber cutting rights, allows the company to harvest timber on timberlands it does not own over a specific time period (currently less than 10 years). The company capitalizes timber deed acquisitions. The company presents timber deed acquisitions under Operating Activities on the Consolidated Statements of Cash Flows. Timber carrying costs, such as real estate taxes, insect control, wildlife control, leases of timberlands (other than lease payments for the purchase of standing timber, in which case the payments are capitalized) and forest management personnel salaries and fringe benefits, are expensed as incurred. Costs of major roads are capitalized and amortized over 30 years. Costs for roads that are built to access multiple logging sites over numerous years are capitalized and amortized over 6 years. Costs for roads built to access a single logging site are expensed as incurred.
	Costs attributable to timber harvested, or depletion, are charged against income as trees are harvested. Depletion rates are determined annually based on the relationship between net carrying value of the timber plus certain capitalizable silviculture costs expected to be incurred over the harvest cycle and total timber volume estimated to be harvested over the harvest cycle. The depletion rate does not include an estimate for either future reforestation costs associated with a stand’s final harvest or future volume in connection with the replanting of a stand subsequent to its final harvest. Net carrying value of the timber and timberlands is used to compute the gain or loss in connection with timberland sales.
	Minerals and Mineral Rights. Minerals and mineral rights are stated at cost less accumulated depletion. The company capitalizes the cost of obtaining minerals and mineral rights. The cost of minerals (primarily coal assets) are charged against income (depletion expense) using the units-of-production method, based on estimated recoverable reserves.
	The costs of mineral rights are charged against income (depletion expense) as the company recognizes royalty income from the sale of the products extracted from the quarries. Depletion rates are determined annually based on the relationship between the net carrying value of the mineral rights over the estimated remaining tons of mineral reserves.
	The company evaluates its minerals and mineral rights for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its mineral rights and coal assets to be a separate asset group based on identifiable cash flows.
	Higher and Better Use Timberlands / Real Estate Development. We estimate that included in the company’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber. Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries.
	Costs associated with a specific real estate development project are capitalized when management estimates that it is probable that a project will be successful. Both external and internal expenditures directly associated with the specific real estate project are capitalized. The company will capitalize improvements and other development costs, including interest costs and property taxes, during the development period. General real estate development costs not related to a specific project and costs incurred before management has concluded that it is probable that a project will be successful (e.g. investigatory costs) are expensed as incurred. For real estate development projects with multiple parcels, the company determines the cost of the individual lots sold by allocating the historical cost of the land, timber, development and common construction costs on a relative sales value.
	Properties developed by the company will generally be low-intensity development limited to activities associated with obtaining entitlements. Capitalized real estate development costs, including the book basis in the related timber and timberlands associated with these developments, were $12 million and $13 million at December 31, 2014 and 2013, respectively. Substantially all of these properties are expected to be sold beyond one year and are included in Other Assets (non-current).
	The company also incurs development costs on some timberlands that are currently still managed for timber operations. These consist of larger and more complicated projects needing more invested capital. These projects have a longer timeframe and are not expected to be sold or developed in the near term. The capitalized development costs for these projects and the book basis of the related timber and timberlands were $37 million and $36 million at December 31, 2014 and December 31, 2013, respectively, and are included in Timber and Timberlands.
	The book basis of timberlands that are considered held for sale are presented in the Consolidated Balance Sheet as Assets Held for Sale. The total book basis for assets held for sale was $98 million at December 31, 2014 and $92 million at December 31, 2013. Generally, timberlands that are under contract to sell or are listed for sale through an independent broker or by a taxable REIT subsidiary and are expected to be sold within the next year are considered assets held for sale. The book basis of timberlands that do not meet the held for sale criteria is included in Timber and Timberlands.
	The company evaluates its real estate development projects for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its real estate development projects to be a separate asset group based on identifiable cash flows.
	Accounting for Equity Method Investments. In 2013, the company and MeadWestvaco Corporation ("MWV") formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the company made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties. The company accounts for this interest under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in the Consolidated Statements of Income. See Note 18 of the Notes to Consolidated Financial Statements.
	In 2008, the company contributed 454,000 acres of timberlands located in its Southern Resources Segment to a timberland venture in exchange for a $705 million preferred interest and a $78 million common interest. The company accounts for these interests under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in our Consolidated Statements of Income. See Note 18 of the Notes to Consolidated Financial Statements.
	Property, Plant and Equipment. Property, plant and equipment are recorded at cost. Replacements of major units of property are capitalized, and the replaced units are retired. Replacement of minor components of property and repair and maintenance costs are charged to expense as incurred.
	The company evaluates its property, plant and equipment for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its manufacturing facilities to be a separate asset group based on identifiable cash flows.
	All property, plant and equipment other than manufacturing machinery (for lumber, plywood and MDF) are depreciated using the straight-line method over the estimated useful lives of the related assets. Manufacturing machinery and equipment are depreciated on either a straight-line basis or a units-of-production basis, which approximates a straight-line basis. Useful lives are 19 years for land improvements, 20 to 45 years for buildings, and 3 to 20 years for machinery and equipment. Leasehold improvements are depreciated over the lease term or estimated useful life, whichever is shorter. The cost and related accumulated depreciation of property sold or retired are removed from the accounts and any gain or loss is recorded. Depreciation expense, excluding impairment charges, was $21 million, $24 million, and $22 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	Grantor Trusts. The company has a grantor trust that was established for deferred compensation and deferred Plum Creek shares. See Note 12 of the Notes to Consolidated Financial Statements. Deferred compensation assets, which include money market and mutual fund investments, are classified as “trading securities” and are carried at market value. Realized gains and losses and changes in unrealized gains and losses and a corresponding amount of compensation expense are recorded in the Consolidated Statements of Income.
	Plum Creek maintains another grantor trust, which the company uses to fund its non-qualified pension plan obligation. See Notes 12 and 14 of the Notes to Consolidated Financial Statements. Money market and mutual fund investments held by this trust are classified as “available for sale securities.” The investments are carried at market values on the company’s Consolidated Balance Sheets. Realized gains and losses are recognized in the Consolidated Statements of Income; changes in unrealized gains and losses are recorded as other comprehensive income or loss, unless an other than temporary impairment has occurred, in which case an impairment loss is recognized in the Consolidated Statements of Income.
	Shipping and Handling Costs. Costs incurred for the transportation of timber and manufactured products are included in Cost of Goods Sold.
	Accounting for Share-Based Compensation. All share-based payments to employees are recognized in the income statement based on their fair values. The company uses the grant date fair values (the closing market price for its common stock) to value stock awards of restricted stock units and common stock. The company also grants share-based awards that are classified and accounted for as liabilities. These awards are valued using a Monte Carlo simulation.
	Other Operating Income (Expense), net. The company will recognize gains and losses from miscellaneous asset sales, insurance recoveries, litigation settlements and other items which are reported in our Consolidated Statements of Income as Other Operating Income (Expense), net. See Note 21 of the Notes to Consolidated Financial Statements. Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1
	Reclassifications. Certain prior year amounts have been reclassified to conform to the 2014 presentation. The reclassifications had no impact on operating income or net income.
	New Accounting Pronouncements. There were no new accounting standards adopted by the company during 2014 that had a material impact on the company's financial condition, results of operations or cash flows.
PLUM CREEK TIMBERLANDS L P [Member]
Accounting Policies	ACCOUNTING POLICIES
	General. Plum Creek Timberlands, L.P. is a Delaware Limited Partnership and a wholly-owned subsidiary of Plum Creek Timber Company, Inc. (“Parent”), a Delaware Corporation and a real estate investment trust, or “REIT”. References herein to “the Operating Partnership,” “we,” “us,” or “our” relate to Plum Creek Timberlands, L.P. and all of its wholly-owned consolidated subsidiaries; references to “Plum Creek” or “Parent” relate to Plum Creek Timber Company, Inc. and all of its wholly-owned consolidated subsidiaries.
	At December 31, 2014, the Operating Partnership owned and managed approximately 6.6 million acres of timberlands in the Northwest, Southern and Northeast United States, and owned seven wood product conversion facilities in the Northwest United States. Included in the 6.6 million acres are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the Operating Partnership has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
	Basis of Presentation. The consolidated financial statements of the Operating Partnership include the accounts of Plum Creek Timberlands, L.P. and its subsidiaries. The Operating Partnership is 100% owned by Plum Creek. Plum Creek has no assets or liabilities other than its direct and indirect ownership interests in Plum Creek Timberlands, L.P. and its interest in Plum Creek Ventures I, LLC (“PC Ventures”), a 100% owned subsidiary of Plum Creek. The Parent has no operations other than its investment in these subsidiaries and transactions in its own equity, such as the issuance and/or repurchase of common stock and the receipt of proceeds from stock option exercises. Intercompany transactions and accounts between Plum Creek Timberlands, L.P. and its subsidiaries have been eliminated in consolidation. All transactions are denominated in United States dollars.
	Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Customer Concentrations. Annual revenues from the Operating Partnership’s largest customer accounted for 7% of total annual revenues in 2014, 2013, and 2012. If market conditions for wood products were to deteriorate, the loss of this customer could have a significant effect on the Operating Partnership’s results of operations.
	Product Concentrations. Sales of the Operating Partnership’s timber and wood products are dependent upon the economic conditions of the housing, repair and remodeling, industrial, and pulp and paper industries. Sales of the Operating Partnership’s timberlands are dependent upon the general economic conditions in the United States, interest rates and the availability of buyer financing from financial institutions, not-for-profit organizations and government sources. As a result of these product concentrations, a prolonged decline in these markets could have a significant impact on the Operating Partnership’s results of operations.
	Revenue Recognition.
	Resources Revenue. Timber sales revenues are recognized when legal ownership and the risk of loss transfers to the purchaser and the quantity sold is determinable. The Operating Partnership sells timber under delivered log agreements as well as through sales of standing timber (or “stumpage”). For delivered sales, revenue, which includes amounts billed for shipping and handling (logging and hauling of timber), is recognized when the log is delivered to the customer. Stumpage is sold using pay-as-cut or, less frequently, using timber deed sale agreements. Under a pay-as-cut sales contract, the purchaser acquires the right to harvest specified timber on a tract, at an agreed upon price per unit. The sale and any related advances are recognized as revenue as the purchaser harvests the timber on the tract. Under a timber deed sale, the buyer agrees to purchase and harvest specified timber on a tract of land over the term of the contract (usually 18 months or less). Unlike a pay-as-cut sales contract, risk of loss and title to the trees transfer to the buyer when the contract is signed. The buyer also pays the full purchase price when the contract is signed. Revenue from a timber deed sale is recognized when the contract is signed.
	Manufacturing Revenue. Revenues generated from the sale of lumber, plywood, medium density fiberboard (“MDF”) and related by-products (primarily wood chips), and amounts billed for shipping and handling, are recognized at the time of delivery.
	Real Estate Revenue. Revenue from the sale of real estate is recognized when the sale has been consummated, the buyer’s initial and ongoing payments are adequate, the risks and rewards of owning the property have transferred to the buyer, and the Operating Partnership has no continuing involvement with the property. For all of our real estate sales, the Operating Partnership receives the entire consideration in cash at closing. Also at closing, the risks and rewards of ownership transfer to the buyer and the Operating Partnership does not have a continuing involvement in our properties after they are sold. Therefore, real estate revenue is recognized at closing.
	Revenue from real estate development projects is generally recognized under the full accrual method of accounting because sales generally do not commence until the project is completed. Broker commissions and closing costs of our Real Estate Segment are included in Cost of Goods Sold.
	The Operating Partnership will occasionally sell timberlands to a single buyer under a multi-period contract covering a series of prescheduled closings and/or options. Under these multi-period contracts, once title and risk of loss have transferred to the buyer for individual properties, the properties sold cannot be returned for a refund. However, deposits for future closings under multi-period contracts may be refunded under certain circumstances. The Operating Partnership treats each closing under a multi-period arrangement as a separate sale. Revenue in connection with a multi-period contract is generally recognized at closing equal to the lesser of the non-refundable consideration received or an allocation of total consideration based on fair value.
	Revenue generated from real estate sales includes the sale of higher value timberlands, non-strategic timberlands and large blocks of timberlands. In some of these transactions, the Operating Partnership sells timberlands that qualify for like-kind (tax-deferred) exchange treatment under the Internal Revenue Code. Substantially all of these sales involve a third party intermediary, whereby the third party intermediary receives proceeds related to the property sold and then reinvests the proceeds in like-kind property. The proceeds are recorded as revenue when the third party intermediary receives them. See “Like-Kind Exchanges”.
	Energy and Natural Resources Revenue. Overriding royalties earned in connection with aggregate mineral rights are recognized as revenue when the underlying aggregates are sold and the Operating Partnership is entitled to its share of the gross selling price. Additionally, royalties from aggregates leases and oil and gas leases are recognized as revenue when the underlying minerals are sold and the Operating Partnership is entitled to its share of the gross selling price. Generally, the mineral owners and lessees make payments to the Operating Partnership based on a percentage of the gross sales price of the minerals they sell. For overriding royalty and lease agreements with varying royalty percentages, revenue recognition is based on the relative-selling-price method, which may result in the deferral of revenue to future periods.
	Also, included within oil and gas royalties are lease bonus payments, which are typically paid upon the execution of a lease. Lease bonus payments are initially recorded as deferred revenue and are generally recognized as revenue over the period the lessee is entitled to explore for oil and gas. Certain of the Operating Partnership's leases are also subject to minimum annual payments. In some cases, lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is also recognized as revenue upon the expiration of the lessee’s ability to recoup the payments.
	Cash and Cash Equivalents. All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents. Substantially all of the cash and cash equivalents are invested in money market funds.
	Accounts Receivable. Accounts receivable is presented net of an allowance for doubtful accounts of $0.2 million at both December 31, 2014 and December 31, 2013. Accounts are deemed past due based on payment terms. The allowance for doubtful accounts represents management’s estimate and is based on historical losses, recent collection history, credit ratings of individual customers and existing economic conditions. Delinquent accounts are charged against the allowance for doubtful accounts to the extent and at the time they are deemed uncollectible.
	Like-Kind Exchanges. The Operating Partnership may enter into like-kind (tax-deferred) exchange transactions to acquire and sell assets, principally timberlands. These transactions may include both forward (timberlands sold, followed by reinvestment of proceeds to acquire timberlands) and reverse (timberlands purchased, followed by receipt of proceeds from timberland sales) like-kind exchanges. The Operating Partnership uses a qualified escrow and/or trust account to facilitate like-kind exchange transactions. Funds from forward like-kind exchange transactions are restricted from being used until the funds are either successfully reinvested in timber and timberlands or the exchange fails and the proceeds are distributed to the Operating Partnership.
	Inventories. Logs, work-in-process and finished goods are stated at the lower of cost or market using the average cost method. A separate lower of cost or market analysis is prepared for each product line (i.e. lumber, plywood and MDF). Net realizable value is determined based on actual selling prices at the end of the accounting period. Losses on firm purchase commitments for logs are recorded when the related manufactured finished products are expected to be sold at a loss based on current product prices. Supplies inventories are stated at cost. Costs for manufactured inventories include raw materials, labor, supplies, energy, depreciation and production overhead. Cost of log inventories include timber depletion, stumpage, associated logging and harvesting costs, road costs and production overhead.
	Timber and Timberlands. Timber (including timber deeds and logging roads) and timberlands are stated at cost less accumulated depletion for timber previously harvested and accumulated road amortization. The Operating Partnership capitalizes timber and timberland purchases along with reforestation costs and other costs associated with the planting and growing of timber, such as site preparation, growing or purchases of seedlings, planting, fertilization, herbicide application and the thinning of tree stands to improve growth. The Operating Partnership presents timber and timberland purchases and the capitalized costs described above under Investing Activities on the Consolidated Statements of Cash Flows. A timber deed, also called timber cutting rights, allows the Operating Partnership to harvest timber on timberlands it does not own over a specific time period (currently less than 10 years). The Operating Partnership capitalizes timber deed acquisitions. The Operating Partnership presents timber deed acquisitions under Operating Activities on the Consolidated Statements of Cash Flows. Timber carrying costs, such as real estate taxes, insect control, wildlife control, leases of timberlands (other than lease payments for the purchase of standing timber, in which case the payments are capitalized) and forest management personnel salaries and fringe benefits, are expensed as incurred. Costs of major roads are capitalized and amortized over 30 years. Costs for roads that are built to access multiple logging sites over numerous years are capitalized and amortized over 6 years. Costs for roads built to access a single logging site are expensed as incurred.
	Costs attributable to timber harvested, or depletion, are charged against income as trees are harvested. Depletion rates are determined annually based on the relationship between net carrying value of the timber plus certain capitalizable silviculture costs expected to be incurred over the harvest cycle and total timber volume estimated to be harvested over the harvest cycle. The depletion rate does not include an estimate for either future reforestation costs associated with a stand’s final harvest or future volume in connection with the replanting of a stand subsequent to its final harvest. Net carrying value of the timber and timberlands is used to compute the gain or loss in connection with timberland sales.
	Minerals and Mineral Rights. Minerals and mineral rights are stated at cost less accumulated depletion. The Operating Partnership capitalizes the cost of obtaining minerals and mineral rights. The cost of minerals (primarily coal assets) are charged against income (depletion expense) using the units-of-production method, based on estimated recoverable reserves.
	The costs of mineral rights are charged against income (depletion expense) as the Operating Partnership recognizes royalty income from the sale of the products extracted from the quarries. Depletion rates are determined annually based on the relationship between the net carrying value of the mineral rights over the estimated remaining tons of mineral reserves.
	The Operating Partnership evaluates its minerals and mineral rights for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its mineral rights and coal assets to be a separate asset group based on identifiable cash flows.
	Higher and Better Use Timberlands / Real Estate Development. We estimate that included in the Operating Partnership’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber. Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries.
	Costs associated with a specific real estate development project are capitalized when management estimates that it is probable that a project will be successful. Both external and internal expenditures directly associated with the specific real estate project are capitalized. The Operating Partnership will capitalize improvements and other development costs, including interest costs and property taxes, during the development period. General real estate development costs not related to a specific project and costs incurred before management has concluded that it is probable that a project will be successful (e.g. investigatory costs) are expensed as incurred. For real estate development projects with multiple parcels, the Operating Partnership determines the cost of the individual lots sold by allocating the historical cost of the land, timber, development and common construction costs on a relative sales value.
	Properties developed by the Operating Partnership will generally be low-intensity development limited to activities associated with obtaining entitlements. Capitalized real estate development costs, including the book basis in the related timber and timberlands associated with these developments, were $12 million and $13 million at December 31, 2014 and 2013, respectively. Substantially all of these properties are expected to be sold beyond one year and are included in Other Assets (non-current).
	The Operating Partnership also incurs development costs on some timberlands that are currently still managed for timber operations. These consist of larger and more complicated projects needing more invested capital. These projects have a longer timeframe and are not expected to be sold or developed in the near term. The capitalized development costs for these projects and the book basis of the related timber and timberlands were $37 million and $36 million at December 31, 2014 and December 31, 2013, respectively, and are included in Timber and Timberlands.
	The book basis of timberlands that are considered held for sale are presented in the Consolidated Balance Sheet as Assets Held for Sale. The total book basis for assets held for sale was $98 million at December 31, 2014 and $92 million at December 31, 2013. Generally, timberlands that are under contract to sell or are listed for sale through an independent broker or by a taxable REIT subsidiary and are expected to be sold within the next year are considered assets held for sale. The book basis of timberlands that do not meet the held for sale criteria is included in Timber and Timberlands.
	The Operating Partnership evaluates its real estate development projects for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its real estate development projects to be a separate asset group based on identifiable cash flows.
	Accounting for Equity Method Investments. In 2013, the Operating Partnership and MeadWestvaco Corporation ("MWV") formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the Operating Partnership made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties. The Operating Partnership accounts for this interest under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in the Consolidated Statements of Income. See Note 16 of the Notes to Consolidated Financial Statements.
	In 2008, a subsidiary of the Operating Partnership, Plum Creek Timber Operations I, LLC (“PC Member”), contributed 454,000 acres of timberlands located in its Southern Resources Segment to a timberland venture in exchange for a $705 million preferred interest and a $78 million common interest. The Operating Partnership accounts for these interests under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in our Consolidated Statements of Income. See Note 16 of the Notes to Consolidated Financial Statements.
	Property, Plant and Equipment. Property, plant and equipment are recorded at cost. Replacements of major units of property are capitalized, and the replaced units are retired. Replacement of minor components of property and repair and maintenance costs are charged to expense as incurred.
	The Operating Partnership evaluates its property, plant and equipment for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its manufacturing facilities to be a separate asset group based on identifiable cash flows.
	All property, plant and equipment other than manufacturing machinery (for lumber, plywood and MDF) are depreciated using the straight-line method over the estimated useful lives of the related assets. Manufacturing machinery and equipment are depreciated on either a straight-line basis or a units-of-production basis, which approximates a straight-line basis. Useful lives are 19 years for land improvements, 20 to 45 years for buildings, and 3 to 20 years for machinery and equipment. Leasehold improvements are depreciated over the lease term or estimated useful life, whichever is shorter. The cost and related accumulated depreciation of property sold or retired are removed from the accounts and any gain or loss is recorded. Depreciation expense, excluding impairment charges, was $21 million, $24 million, and $22 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	Grantor Trusts. The Operating Partnership has a grantor trust that was established for deferred compensation and deferred Plum Creek shares. See Note 10 of the Notes to Consolidated Financial Statements. Deferred compensation assets, which include money market and mutual fund investments, are classified as “trading securities” and are carried at market value. Realized gains and losses and changes in unrealized gains and losses and a corresponding amount of compensation expense are recorded in the Consolidated Statements of Income.
	The Operating Partnership maintains another grantor trust, which the Operating Partnership uses to fund its non-qualified pension plan obligation. See Notes 10 and 12 of the Notes to Consolidated Financial Statements. Money market and mutual fund investments held by this trust are classified as “available for sale securities.” The investments are carried at market values on the Operating Partnership’s Consolidated Balance Sheets. Realized gains and losses are recognized in the Consolidated Statements of Income; changes in unrealized gains and losses are recorded as other comprehensive income or loss, unless an other than temporary impairment has occurred, in which case an impairment loss is recognized in the Consolidated Statements of Income.
	Shipping and Handling Costs. Costs incurred for the transportation of timber and manufactured products are included in Cost of Goods Sold.
	Accounting for Share-Based Compensation. All share-based payments to employees are recognized in the income statement based on their fair values. The Operating Partnership uses the grant date fair values (the closing market price for Plum Creek’s common stock) to value Plum Creek stock awards of restricted stock units and common stock. Plum Creek also grants share-based awards that are classified and accounted for as liabilities. These awards are valued using a Monte Carlo simulation.
	Other Operating Income (Expense), net. The Operating Partnership will recognize gains and losses from miscellaneous asset sales, insurance recoveries, litigation settlements and other items which are reported in our Consolidated Statements of Income as Other Operating Income (Expense), net. See Note 19 of the Notes to Consolidated Financial Statements. Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1
	Reclassifications. Certain prior year amounts have been reclassified to conform to the 2014 presentation. The reclassifications had no impact on operating income or net income.
	New Accounting Pronouncements. There were no new accounting standards adopted by the Operating Partnership during 2014 that had a material impact on the Operating Partnership's financial condition, results of operations or cash flows.

Business_Acquisition

Business Acquisition	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Business Acquisition [Line Items]
Business Acquisition	BUSINESS ACQUISITION
	On December 6, 2013 ("the Acquisition Date"), the company acquired approximately 501,000 acres of timberlands in Alabama, Georgia, South Carolina, Virginia, and West Virginia from MeadWestvaco Corporation ("MWV") for $869 million. Certain minerals and wind power leases associated with the timberlands were also acquired for $65 million. The acquisition of the timberlands and related minerals and wind power leases ($934 million) was funded by an $860 million installment note payable and by $74 million in cash. In addition, the company and MWV formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the company made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties with an agreed-upon value of $531 million. The total purchase price for the MWV timberland assets, including amounts contributed to MWV-Charleston Land Partners, LLC, was $1.1 billion, which consisted of $226 million in cash ($221 million cash after considering post-closing adjustments) and an installment note payable of $860 million.
	Prior to closing the acquisition, the company issued 13,915,000 shares of common stock on November 4, 2013. The net proceeds of $607 million from the equity offering were used to pay the cash portion of the acquisition and the acquisition related transaction costs, with the balance used to repay $376 million of outstanding debt obligations.
	MWV-Charleston Land Partners, LLC ("MWV-CLP") consisted of 109,000 acres of high-value rural lands and development-quality lands near Charleston, South Carolina. The company acquired a 50% interest in 87,000 acres of high-value lands (agreed upon value of $279 million) for which MWV-CLP will pursue an entitlement and development strategy over the next several years. In addition, the company acquired a 5% interest in approximately 22,000 acres of residential, commercial and industrial properties (agreed upon value of $252 million) that are actively being developed in the same market. During 2014, the company’s ownership interest in the 22,000 acres of residential, commercial and industrial properties decreased from 5% to 4% due to capital calls by MWV-CLP for which the company declined to participate. An affiliate of MWV has been hired to manage the operations of MWV-CLP.
	The acquisition of the MWV timberlands and related assets complements the company's existing ownership in the Southern U.S. and increased the company's annual timber harvest volumes by over 2 million tons during 2014. The timberlands, which have a long history of excellent forest management, are commingled with the company's existing timberlands and are located in attractive markets where the company would like to further expand its presence. Additionally, all of the timberlands acquired are certified under the SFISM program. The equity investment in MWV-CLP expands the company's portfolio of high-value rural timberlands, an asset for which the company has experience maximizing values.
	The company has accounted for the acquisition as a purchase business combination. Under the purchase method, the assets acquired from MWV, along with the company's equity investment in MWV-CLP, were recorded as of the Acquisition Date at their respective fair values. Plum Creek's investment in MWV-CLP is accounted for under the equity method of accounting. See Note 18 of the Notes to Consolidated Financial Statements.
	The following table summarizes the assets acquired as of the acquisition date at fair value (in millions):
	Assets Acquired:	Fair Value
	Timber and Logging Roads	$	517
	Timberlands	352
	Minerals and Mineral Rights	57
	Property, Plant and Equipment	1
	Equity Method Investments	139
	Intangible Assets	15
	Deferred Tax Assets	4
	Total Assets Acquired	$	1,085
	Intangible Assets. The following table summarizes the purchased intangible assets subject to amortization (in millions):
	Description		Fair Value		Amortization Period (in years) (B)
	Acquired Wind Leases		$	10	20
	Acquired Land Leases(A)		7		10
	Fiber Supply Agreement		5		10
	Total Intangible Assets Acquired		$	22
	(A)	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.
	(B)	The amortization method for the purchased intangible assets approximates straight-line.
	Acquisition Costs. The company recognized approximately $5 million of acquisition related costs that were expensed during 2013. These costs are included within Selling, General and Administrative Expenses in the Consolidated Statements of Income.
	Actual and Pro Forma Impact of the Acquisition. The amount of revenue and net income included in the company's Consolidated Statements of Income from the Acquisition Date to December 31, 2013 are as follows (in millions):
	Revenue	$	3
	Net Income	$	—
	The unaudited pro forma results presented below include the effects of the acquisition, including the share issuance and debt repayments discussed above, as if it had been consummated as of January 1, 2012. In addition to the historical revenues and expenses of the acquisition, the pro forma results include adjustments to conform the acquisition's timber depletion to the company's accounting method. Pro forma adjustments have been made for interest expense, including the note payable to finance the acquisition and the debt repaid following the common stock issuance. Pro forma adjustments include the elimination of substantially all of the historical income tax expense due primarily to Plum Creek's status as a REIT. Finally, pro forma adjustments have been made for mineral depletion and logging road depreciation, and for the equity earnings / (losses) that would have resulted from the company's equity method investment in MWV-CLP. No pro forma adjustments were made for timberland sales by MWV since the acres sold were not acquired by the company and were not included in the purchase price allocation. As a result, pro forma results for 2012 include revenue of $99 million and related cost of sales of $18 million from the sale of approximately 49,000 acres, and for 2013, pro forma results include revenue of $87 million and related cost of sales of $12 million from the sale of approximately 41,000 acres by MWV. The operating margin for future timberland sales from the acquisition is expected to be substantially lower than MWV's historical operating margin as a result of allocating a portion of the purchase price to timber and timberlands. The unaudited pro forma financial information has been prepared for comparative purposes only and is not necessarily indicative of either future results of operations or results that might have been achieved had the acquisition been consummated as of January 1, 2012.
			2013		2012
	Pro Forma Revenue		$	1,491	$	1,513
	Pro Forma Net Income		$	253	$	238
PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition [Line Items]
Business Acquisition	BUSINESS ACQUISITION
	On December 6, 2013 ("the Acquisition Date"), the Operating Partnership acquired approximately 501,000 acres of timberlands in Alabama, Georgia, South Carolina, Virginia, and West Virginia from MeadWestvaco Corporation ("MWV") for $869 million. Certain minerals and wind power leases associated with the timberlands were also acquired for $65 million. The acquisition of the timberlands and related minerals and wind power leases ($934 million) was funded by an $860 million installment note payable and by $74 million in cash. In addition, the Operating Partnership and MWV formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the Operating Partnership made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties with an agreed-upon value of $531 million. The total purchase price for the MWV timberland assets, including amounts contributed to MWV-Charleston Land Partners, LLC, was $1.1 billion, which consisted of $226 million in cash ($221 million cash after considering post-closing adjustments) and an installment note payable of $860 million.
	Prior to closing the acquisition, Plum Creek issued 13,915,000 shares of common stock on November 4, 2013. The net proceeds of $607 million from the equity offering were contributed by Plum Creek to the Operating Partnership and were used to pay the cash portion of the acquisition and the acquisition related transaction costs, with the balance used to repay $376 million of outstanding debt obligations of the Operating Partnership.
	MWV-Charleston Land Partners, LLC ("MWV-CLP") consisted of 109,000 acres of high-value rural lands and development-quality lands near Charleston, South Carolina. The Operating Partnership acquired a 50% interest in 87,000 acres of high-value lands (agreed upon value of $279 million) for which MWV-CLP will pursue an entitlement and development strategy over the next several years. In addition, the Operating Partnership acquired a 5% interest in approximately 22,000 acres of residential, commercial and industrial properties (agreed upon value of $252 million) that are actively being developed in the same market. During 2014, the Operating Partnership's ownership interest in the 22,000 acres of residential, commercial and industrial properties decreased from 5% to 4% due to capital calls by MWV-CLP for which the Operating Partnership declined to participate. An affiliate of MWV has been hired to manage the operations of MWV-CLP.
	The acquisition of the MWV timberlands and related assets complements the Operating Partnership's existing ownership in the Southern U.S. and increased the Operating Partnership's annual timber harvest volumes by over 2 million tons during 2014. The timberlands, which have a long history of excellent forest management, are commingled with the Operating Partnership's existing timberlands and are located in attractive markets where the Operating Partnership would like to further expand its presence. Additionally, all of the timberlands acquired are certified under the SFISM program. The equity investment in MWV-CLP expands the Operating Partnership's portfolio of high-value rural timberlands, an asset for which the Operating Partnership has experience maximizing values.
	The Operating Partnership has accounted for the acquisition as a purchase business combination. Under the purchase method, the assets acquired from MWV, along with the Operating Partnership's equity investment in MWV-CLP, were recorded as of the Acquisition Date at their respective fair values. The Operating Partnership's investment in MWV-CLP is accounted for under the equity method of accounting. See Note 16 of the Notes to Consolidated Financial Statements.
	The following table summarizes the assets acquired as of the acquisition date at fair value (in millions):
	Assets Acquired:	Fair Value
	Timber and Logging Roads	$	517
	Timberlands	352
	Minerals and Mineral Rights	57
	Property, Plant and Equipment	1
	Equity Method Investments	139
	Intangible Assets	15
	Deferred Tax Assets	4
	Total Assets Acquired	$	1,085
	Intangible Assets. The following table summarizes the purchased intangible assets subject to amortization (in millions):
	Description		Fair Value		Amortization Period (in years) (B)
	Acquired Wind Leases		$	10	20
	Acquired Land Leases(A)		7		10
	Fiber Supply Agreement		5		10
	Total Intangible Assets Acquired		$	22
	(A)	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.
	(B)	The amortization method for the purchased intangible assets approximates straight-line.
	Acquisition Costs. The Operating Partnership recognized approximately $5 million of acquisition related costs that were expensed during 2013. These costs are included within Selling, General and Administrative Expenses in the Consolidated Statements of Income.
	Actual and Pro Forma Impact of the Acquisition. The amount of revenue and net income included in the Operating Partnership's Consolidated Statements of Income from the Acquisition Date to December 31, 2013 are as follows (in millions):
	Revenue	$	3
	Net Income	$	—
	The unaudited pro forma results presented below include the effects of the acquisition, including the share issuance, capital contribution from Plum Creek, and debt repayments discussed above, as if it had been consummated as of January 1, 2012. In addition to the historical revenues and expenses of the acquisition, the pro forma results include adjustments to conform the acquisition's timber depletion to the Operating Partnership's accounting method. Pro forma adjustments have been made for interest expense, including the note payable to finance the acquisition and the debt repaid following the capital contribution from Plum Creek. Pro forma adjustments include the elimination of substantially all of the historical income tax expense due primarily to Plum Creek's status as a REIT. Finally, pro forma adjustments have been made for mineral depletion and logging road depreciation, and for the equity earnings / (losses) that would have resulted from the Operating Partnership's equity method investment in MWV-CLP. No pro forma adjustments were made for timberland sales by MWV since the acres sold were not acquired by the Operating Partnership and were not included in the purchase price allocation. As a result, pro forma results for 2012 include revenue of $99 million and related cost of sales of $18 million from the sale of approximately 49,000 acres, and for 2013, pro forma results include revenue of $87 million and related cost of sales of $12 million from the sale of approximately 41,000 acres by MWV. The operating margin for future timberland sales from the acquisition is expected to be substantially lower than MWV's historical operating margin as a result of allocating a portion of the purchase price to timber and timberlands. The unaudited pro forma financial information has been prepared for comparative purposes only and is not necessarily indicative of either future results of operations or results that might have been achieved had the acquisition been consummated as of January 1, 2012.
			2013		2012
	Pro Forma Revenue		$	1,491	$	1,513
	Pro Forma Net Income		$	253	$	238

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE
	The following table sets forth the reconciliation of basic and diluted earnings per share for the years ended December 31 (in millions, except per share amounts):
		2014			2013		2012
	Net Income Available to Common Stockholders	$	214		$	214	$	203
	Denominator for Basic Earnings per Share	176.7			164.6		161.5
	Effect of Dilutive Securities – Stock Options	0.2			0.3		0.3
	Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan	0.1			0.1		0.1
	Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities	177			165		161.9
	Per Share Amounts:
	Net Income per Share - Basic	$	1.21		$	1.3	$	1.25
	Net Income per Share - Diluted	$	1.21		$	1.3	$	1.25
	Under the company's Stock Incentive Plan (See Note 15 of the Notes to Consolidated Financial Statements), the company grants restricted stock units, which prior to vesting, are entitled to non-forfeitable cash payments equal to dividends paid on the company's common shares. These awards are considered participating securities for purposes of computing basic and diluted earnings per share.
	Antidilutive options were excluded for certain periods from the computation of diluted earnings per share because the exercise prices of the options were greater than the average market price of the common shares. Antidilutive options were as follows for the years ended December 31 (shares in millions):
		2014		2013	2012
	Number of Options	0.1		—	0.9
	Range of Exercise Prices	$42.98 to $43.23		N/A	$41.55 to $43.23
	Expiration on or before	Feb-18		N/A	Feb-21

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Inventories	INVENTORIES
	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Raw Materials (primarily logs)	$	12	$	9
	Work-In-Process	3		2
	Finished Goods	31		30
		46		41
	Supplies	15		14
	Total	$	61	$	55
PLUM CREEK TIMBERLANDS L P [Member]
Inventories	INVENTORIES
	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Raw Materials (primarily logs)	$	12	$	9
	Work-In-Process	3		2
	Finished Goods	31		30
		46		41
	Supplies	15		14
	Total	$	61	$	55

Timber_and_Timberlands

Timber and Timberlands	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands	TIMBER AND TIMBERLANDS
	Timber and Timberlands consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Timber and Logging Roads, net	$	2,518		$	2,630
	Timber Deeds, net	83			95
	Timberlands	1,408			1,455
	Timber and Timberlands, net	$	4,009		$	4,180
	Timber and Timberlands. During 2014, the company disposed of approximately 184,000 acres, of which 136,000 acres were located in the Northern Resources Segment and 48,000 acres were located in the Southern Resources Segment.
	During 2013, the company acquired approximately 501,000 acres of timberlands in Alabama, Georgia, South Carolina, Virginia, and West Virginia from MeadWestvaco Corporation ("MWV") for $869 million. This acquisition was accounted for as a business combination and is described in Note 2 of the Notes to Consolidated Financial Statements.
	Also during 2013, the company acquired approximately 50,000 acres of timberlands primarily located in Georgia and Alabama for a total of $81 million. These purchases were financed primarily from the company's line of credit and have been accounted for as asset acquisitions. Timberland dispositions during 2013 were approximately 168,000 acres, of which 66,000 acres were located in the Northern Resources Segment and 102,000 acres were located in the Southern Resources Segment.
	During the third quarter of 2013, the company's Northern Resources Segment recognized a $4 million loss, representing the book basis of timber volume destroyed as a result of forest fires in Montana and Oregon.
	Timber Deeds. The company owns two timber deeds in the Southern Resources Segment, both of which expire in 2020. The volume acquired under these timber deeds, along with future growth, is being harvested over the term of the deeds. The company reflects the purchase price of timber deeds in the Consolidated Statements of Cash Flows as outflows under Cash Provided by Operating Activities.
	In March 2013, the company purchased a timber deed for $18 million, which encompassed approximately 0.9 million tons of standing timber. In January 2012, the company purchased a timber deed for $103 million, of which $5 million was paid as a deposit in December 2011. The timber deed consisted of approximately 4.7 million tons of standing timber.
	Impairments. The company's Real Estate Segment revenue consists of sales of higher and better use timberlands and sales of non-strategic timberlands. Occasionally, timberlands are sold at a loss. Each potential real estate sale is evaluated for a possible impairment in accordance with the accounting for long-lived assets classified as held for sale. At December 31, 2014, the book basis of real estate held for sale was $98 million and was $92 million as of December 31, 2013. Impairment losses are included in Cost of Goods Sold for Real Estate in our Consolidated Statements of Income.
	Impairment losses recorded for the potential sale of timberlands and the associated book basis after the impairment recognition were as follows for the years ended December 31 (in millions):
		2014 (A)			2013			2012
	Impairment Losses	$	7		$	4		$	—
	Book Basis of Property	$	46		$	37		$	4
	(A)    During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000
	acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
	The fair values of the impaired assets were primarily determined based on external appraisals and an offer received from a third party. See Note 12 of the Notes to Consolidated Financial Statements.
	Multiple-Element Arrangements. As stated above, during the fourth quarter of 2014, our Board of Directors approved the sale of approximately 165,000 acres in Montana and Washington to The Nature Conservancy for a total sales price of $131 million. This sale closed in two phases with the sale of the Washington properties closing during the fourth quarter of 2014 and the sale of the Montana properties closing in January 2015. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal.
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands	TIMBER AND TIMBERLANDS
	Timber and Timberlands consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Timber and Logging Roads, net	$	2,518		$	2,630
	Timber Deeds, net	83			95
	Timberlands	1,408			1,455
	Timber and Timberlands, net	$	4,009		$	4,180
	Timber and Timberlands. During 2014, the Operating Partnership disposed of approximately 184,000 acres, of which 136,000 acres were located in the Northern Resources Segment and 48,000 acres were located in the Southern Resources Segment.
	During 2013, the Operating Partnership acquired approximately 501,000 acres of timberlands in Alabama, Georgia, South Carolina, Virginia, and West Virginia from MeadWestvaco Corporation ("MWV") for $869 million. This acquisition was accounted for as a business combination and is described in Note 2 of the Notes to Consolidated Financial Statements.
	Also during 2013, the Operating Partnership acquired approximately 50,000 acres of timberlands primarily located in Georgia and Alabama for a total of $81 million. These purchases were financed primarily from the Operating Partnership's line of credit and have been accounted for as asset acquisitions. Timberland dispositions during 2013 were approximately 168,000 acres, of which 66,000 acres were located in the Northern Resources Segment and 102,000 acres were located in the Southern Resources Segment.
	During the third quarter of 2013, the Operating Partnership's Northern Resources Segment recognized a $4 million loss, representing the book basis of timber volume destroyed as a result of forest fires in Montana and Oregon.
	Timber Deeds. The Operating Partnership owns two timber deeds in the Southern Resources Segment, both of which expire in 2020. The volume acquired under these timber deeds, along with future growth, is being harvested over the term of the deeds. The Operating Partnership reflects the purchase price of timber deeds in the Consolidated Statements of Cash Flows as outflows under Cash Provided by Operating Activities.
	In March 2013, the Operating Partnership purchased a timber deed for $18 million, which encompassed approximately 0.9 million tons of standing timber. In January 2012, the Operating Partnership purchased a timber deed for $103 million, of which $5 million was paid as a deposit in December 2011. The timber deed consisted of approximately 4.7 million tons of standing timber.
	Impairments. The Operating Partnership’s Real Estate Segment revenue consists of sales of higher and better use timberlands and sales of non-strategic timberlands. Occasionally, timberlands are sold at a loss. Each potential real estate sale is evaluated for a possible impairment in accordance with the accounting for long-lived assets classified as held for sale. At December 31, 2014, the book basis of real estate held for sale was $98 million and was $92 million as of December 31, 2013. Impairment losses are included in Cost of Goods Sold for Real Estate in our Consolidated Statements of Income.
	Impairment losses recorded for the potential sale of timberlands and the associated book basis after the impairment recognition were as follows for the years ended December 31 (in millions):
			2014 (A)			2013			2012
	Impairment Losses		$	7		$	4		$	—
	Book Basis of Property		$	46		$	37		$	4
	(A)    During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000
	acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
	The fair values of the impaired assets were primarily determined based on external appraisals and an offer received from a third party. See Note 10 of the Notes to Consolidated Financial Statements.
	Multiple-Element Arrangements. As stated above, during the fourth quarter of 2014, our Board of Directors approved the sale of approximately 165,000 acres in Montana and Washington to The Nature Conservancy for a total sales price of $131 million. This sale closed in two phases with the sale of the Washington properties closing during the fourth quarter of 2014 and the sale of the Montana properties closing in January 2015. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal.

Minerals_and_Mineral_Rights

Minerals and Mineral Rights	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals and Mineral Rights	MINERALS AND MINERAL RIGHTS
	Minerals and Mineral Rights consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Minerals, net	$	55		$	60
	Mineral Rights, net	$	234		$	238
	Minerals and Mineral Rights, net	$	289		$	298
	Minerals. In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013 (see Note 2 of the Notes to Consolidated Financial Statements), the company acquired certain proven and probable coal reserves along with related surface lease intangibles (see below). The coal reserves had an estimated acquisition date fair value of $50 million, and the surface leases had an estimated acquisition date fair value of $7 million. Depletion expense associated with the minerals owned by the company was approximately $1 million for each of the years ended December 31, 2014 and 2013.
	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the company acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the company acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the company adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	The company's overriding royalty percentage associated with the 255 million tons of aggregate reserves and 144 million tons of aggregate reserves declines after five years and declines further after ten years. The company treats each year under the royalty arrangement as a separate unit of account. Based on projected sales volume over the term of the arrangement, the company estimates a weighted-average overriding royalty percentage. The company recognizes revenue based on the weighted-average overriding royalty percentage and records deferred revenue for overriding royalties received in excess of the weighted-average percentage.
	Depletion and amortization expense associated with the above acquired mineral rights and surface lease intangibles was $6 million and $1 million for the years ending December 31, 2014 and 2013, respectively. The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals and Mineral Rights	MINERALS AND MINERAL RIGHTS
	Minerals and Mineral Rights consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Minerals, net	$	55		$	60
	Mineral Rights, net	$	234		$	238
	Minerals and Mineral Rights, net	$	289		$	298
	Minerals. In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013 (see Note 2 of the Notes to Consolidated Financial Statements), the Operating Partnership acquired certain proven and probable coal reserves along with related surface lease intangibles (see below). The coal reserves had an estimated acquisition date fair value of $50 million, and the surface leases had an estimated acquisition date fair value of $7 million. Depletion expense associated with the minerals owned by the Operating Partnership was approximately $1 million for each of the years ended December 31, 2014 and 2013.
	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the Operating Partnership acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the Operating Partnership acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the Operating Partnership adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	The Operating Partnership's overriding royalty percentage associated with the 255 million tons of aggregate reserves and 144 million tons of aggregate reserves declines after five years and declines further after ten years. The Operating Partnership treats each year under the royalty arrangement as a separate unit of account. Based on projected sales volume over the term of the arrangement, the Operating Partnership estimates a weighted-average overriding royalty percentage. The Operating Partnership recognizes revenue based on the weighted-average overriding royalty percentage and records deferred revenue for overriding royalties received in excess of the weighted-average percentage.
	Depletion and amortization expense associated with the above acquired mineral rights and surface lease intangibles was $6 million and $1 million for the years ending December 31, 2014 and 2013, respectively. The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234

Intangible_Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Intangible Assets Disclosure [Text Block]	INTANGIBLE ASSETS
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—	$	10
	Fiber Supply Agreement	5			—			5		5		—		5
	Total	$	15		$	(1	)	$	14	$	15	$	—	$	15
	Wind Power Leases. In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013 (see Note 2 of the Notes to Consolidated Financial Statements), the company acquired certain wind power leases. The wind power leases had an acquisition date fair value of $10 million. The value of the wind power leases is expected to be amortized on a straight-line basis over the twenty year term of the agreements.
	Fiber Supply Agreement. Also, in connection with the timberland acquisition from MeadWestvaco Corporation in 2013, the company acquired a fiber supply agreement. The fiber supply agreement had an acquisition date fair value of $5 million. The value of the fiber supply agreement is expected to be amortized on a straight-line basis over the ten year term of the agreement.
	Amortization expense associated with the above intangible assets was $1 million and $0 for the years ending December 31, 2014 and 2013, respectively. The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14
	See also Note 6 of the Notes to Consolidated Financial Statements.
PLUM CREEK TIMBERLANDS L P [Member]
Intangible Assets Disclosure [Text Block]	INTANGIBLE ASSETS
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—	$	10
	Fiber Supply Agreement	5			—			5		5		—		5
	Total	$	15		$	(1	)	$	14	$	15	$	—	$	15
	Wind Power Leases. In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013 (see Note 2 of the Notes to Consolidated Financial Statements), the Operating Partnership acquired certain wind power leases. The wind power leases had an acquisition date fair value of $10 million. The value of the wind power leases is expected to be amortized on a straight-line basis over the twenty year term of the agreements.
	Fiber Supply Agreement. Also, in connection with the timberland acquisition from MeadWestvaco Corporation in 2013, the Operating Partnership acquired a fiber supply agreement. The fiber supply agreement had an acquisition date fair value of $5 million. The value of the fiber supply agreement is expected to be amortized on a straight-line basis over the ten year term of the agreement.
	Amortization expense associated with the above intangible assets was $1 million and $0 for the years ending December 31, 2014 and 2013, respectively. The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14
	See also Note 5 of the Notes to Consolidated Financial Statements.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	Property, Plant and Equipment consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Land, Buildings and Improvements	$	97		$	91
	Machinery and Equipment	331			323
		428			414
	Accumulated Depreciation	(308		)	(296		)
	Property, Plant and Equipment, net	$	120		$	118
PLUM CREEK TIMBERLANDS L P [Member]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	Property, Plant and Equipment consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Land, Buildings and Improvements	$	97		$	91
	Machinery and Equipment	331			323
		428			414
	Accumulated Depreciation	(308		)	(296		)
	Property, Plant and Equipment, net	$	120		$	118

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Income Taxes	INCOME TAXES
	Plum Creek has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code. A REIT generally does not pay corporate-level income tax if it distributes 100% of its taxable income to shareholders and satisfies other organizational and operational requirements as set forth in the Internal Revenue Code. If a company fails to qualify as a REIT in any taxable year, it will be subject to federal income taxes at regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for four subsequent taxable years.
	Plum Creek operates as a REIT through various wholly-owned subsidiaries and a joint venture partnership. The activities of the operating partnerships and joint venture partnership consist primarily of sales of standing timber under pay-as-cut sales contracts. The book basis of the REIT’s assets and liabilities exceeds its tax basis by approximately $1.8 billion at December 31, 2014.
	Plum Creek conducts certain activities through various wholly-owned taxable REIT subsidiaries, which are subject to corporate-level income tax. These activities include the company’s manufacturing operations, the harvesting and sale of logs, the development and/or sale of some of the company’s higher value timberlands, timber and wood fiber procurement services, coal leases, and the company's investment in real estate development ventures (see Note 18 of the Notes to Consolidated Financial Statements). Plum Creek’s taxable REIT subsidiaries file a consolidated federal income tax return.
	The company recognizes interest and penalties, if incurred, related to income taxes in the Provision for Income Taxes in the Consolidated Statements of Income. During the years ended December 31, 2014, 2013, and 2012, amounts for interest and penalties included in the tax provision were insignificant. At December 31, 2014, and December 31, 2013, the company had no accrued interest or penalties related to income taxes.
	The provision (benefit) for income taxes consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Current Income Taxes:
	Federal	$	3		$	—		$	—
	State	1			—			—
	Deferred Income Taxes:
	Federal	4			(1		)	(3		)
	State	(2		)	—			—
	Benefit from Operating Loss Carryforward	—			(1		)	(1		)
	Change to Valuation Allowance	2			1			1
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	The provision (benefit) for income taxes is reconciled as follows to the federal statutory rate for the years ended December 31 (in millions):
		2014			2013			2012
	Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	$	78		$	75		$	70
	REIT Income not Subject to Federal Tax	(58		)	(69		)	(66		)
	Change to Valuation Allowance	2			1			1
	State Income Tax Expense (Benefit), net of Federal Benefit	(1		)	(1		)	(1		)
	Permanent Book-Tax Differences	(13		)	(7		)	(7		)
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	The federal statutory income tax rate is 35%. The income generated by the activities of the REIT is generally not subject to federal income tax. The permanent book-tax differences consist primarily of differences in cost basis for certain properties contributed (sold for tax purposes) to the taxable REIT subsidiaries that were subsequently sold, in which the tax basis exceeded the book basis.
	Total income tax provision (benefit) was allocated as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	Other Comprehensive Income	(7		)	7			1
	Additional Paid-In Capital (Share-Based Compensation)	—			(1		)	—
	Total Income Tax Provision (Benefit)	$	1		$	5		$	(2	)
	Deferred income taxes are provided for the temporary differences between the financial reporting basis and tax basis for the assets and liabilities of the taxable REIT subsidiaries. The components of deferred income tax assets and liabilities are as follows at December 31 (in millions):
		2014			2013
	Deferred Income Tax Assets:
	Net Operating Loss Carryforwards	$	12		$	13
	Accrued Compensation	8			9
	Accrued Pension Benefits	16			9
	Timber and Timberlands	15			13
	Accrued Workers' Compensation Benefits	3			4
	Other Accruals and Reserves	6			7
	Valuation Allowance	(12		)	(10		)
		48			45
	Deferred Income Tax Liabilities:
	Machinery and Equipment	(19		)	(19		)
		(19		)	(19		)
	Deferred Income Tax Asset, net	$	29		$	26
	The company has state net operating loss carryforwards for its taxable REIT subsidiaries of $261 million at December 31, 2014, which includes a portion of net operating loss carryfowards related to the REIT (i.e. Plum Creek). REIT net operating losses are generated to the extent the deduction for dividends paid exceeds Plum Creek's taxable income. In certain states, the company files a combined tax return for the REIT and the taxable REIT subsidiaries (a unitary return) and, therefore, may be able to utilize a portion of the REIT's net operating losses. The company's total state net operating loss carryforward deferred income tax asset is $12 million at December 31, 2014. The state net operating loss carryfowards will begin to expire in 2015.
	At December 31, 2014, the company had a valuation allowance of $12 million to reflect the estimated amount of deferred tax assets that may not be realized. The valuation allowance is related to certain state net operating loss carryforwards and other associated deferred tax assets that we do not believe it is more likely than not will be realized in future periods. The determination of the realization of deferred tax assets is based upon management's judgment of various future events and uncertainties, including the timing, nature and amount of future taxable income earned by certain wholly-owned subsidiaries. A valuation allowance is recognized if management believes it is more likely than not that some portion, or all, of the deferred tax asset will not be realized. The company has recorded gross deferred tax assets of $65 million (net of a $12 million valuation allowance) and $61 million (net of a $10 million valuation allowance) as of December 31, 2014 and December 31, 2013, respectively. Management believes that due to the reversal of various taxable temporary differences and/or the planned execution of prudent and feasible tax planning strategies, sufficient taxable income can be generated to utilize the company's remaining deferred tax assets for which a valuation allowance was determined to be unnecessary.
	The net deferred income tax asset is classified on our Consolidated Balance Sheets as follows at December 31 (in millions):
		2014			2013
	Current Deferred Income Tax Asset	$	6		$	9
	Non Current Deferred Income Tax Asset	23			17
	Deferred Income Tax Asset, net	$	29		$	26
	As of December 31, 2014 and December 31, 2013, we did not have any liabilities for unrecognized tax benefits. Except as described below, we believe the statute of limitations for tax assessments has expired for all tax years prior to 2010. We continue to monitor the progress of ongoing income tax controversies. We do not currently believe there is a reasonable possibility of recording a liability for unrecognized tax benefits within the next twelve months.
	Prior to 2011, Plum Creek was generally subject to corporate-level tax (built-in gains tax) when the company made a taxable disposition of certain properties acquired in a 2001 merger. The built-in gains tax applied to gains recognized from such asset sales to the extent that the fair value of the property exceeded its tax basis at the merger date. Built-in gains tax was generally not payable on dispositions of property to the extent the proceeds from such dispositions were reinvested in qualifying like-kind replacement property.
	The company's 2008 federal income tax return is currently being audited by the Internal Revenue Service (“IRS”). The IRS has proposed an adjustment to the company's U.S. federal income tax treatment of the Timberland Venture formation transaction, which occurred on October 1, 2008, on the basis that the transfer of the timberlands to Southern Diversified Timber, LLC was a taxable transaction to the company at the time of the transfer rather than a nontaxable capital contribution to the Timberland Venture. The company has filed a protest with IRS Appeals.
	If the IRS's position is upheld on administrative or judicial appeal, it could result in a maximum built-in gains tax liability of approximately $100 million. In addition, the company could be required to accelerate the distribution to its stockholders of up to $600 million of gain from the transaction. The company expects that as much as 80% of any such distribution could be made with the company's common stock, and stockholders would be subject to tax on the distribution at the applicable capital gains tax rate. The company would also be required to pay interest, which could be substantial, and, if applicable, penalties.
	We believe the transfer of the timberlands was a nontaxable contribution to the Timberland Venture and not a taxable transaction. We have not accrued income taxes for financial reporting purposes with respect to this matter. We are confident in our position and believe that the proposed re-characterization of the Timberland Venture formation transaction by the IRS will ultimately be unsuccessful. We intend to vigorously contest this re-characterization.
PLUM CREEK TIMBERLANDS L P [Member]
Income Taxes	INCOME TAXES
	Plum Creek Timberlands, L.P. is a wholly-owned limited partnership and therefore, not subject to income tax. Plum Creek Timberlands, L.P.’s taxable income is allocated 100% (directly and indirectly) to its parent, Plum Creek Timber Company, Inc., which has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code. A REIT generally does not pay corporate-level income tax if it distributes 100% of its taxable income to shareholders and satisfies other organizational and operational requirements as set forth in the Internal Revenue Code. If a company fails to qualify as a REIT in any taxable year, it will be subject to federal income taxes at regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for four subsequent taxable years. The book basis of Plum Creek’s assets and liabilities exceeds its tax basis by approximately $1.8 billion at December 31, 2014.
	The Operating Partnership conducts certain non-REIT activities through various wholly-owned taxable REIT subsidiaries, which are subject to corporate-level income tax. These activities include our manufacturing operations, the harvesting and sale of logs, the development and/or sale of some of the Operating Partnership's higher value timberlands, timber and wood fiber procurement services, coal leases, and the Operating Partnership's investment in real estate development ventures (see Note 16 of the Notes to Consolidated Financial Statements). The Operating Partnership’s tax provision includes the tax expense and/or benefit associated with Plum Creek’s wholly-owned taxable REIT subsidiaries, as well as any tax expense and/or benefit incurred by the REIT. The effective tax rate for the Operating Partnership is lower than the federal corporate statutory rate primarily due to Plum Creek’s status as a REIT.
	The Operating Partnership recognizes interest and penalties, if incurred, related to income taxes in the Provision for Income Taxes in the Consolidated Statements of Income. During the years ended December 31, 2014, 2013 and 2012, amounts for interest and penalties included in the tax provision were insignificant. At December 31, 2014, and December 31, 2013, the Operating Partnership had no accrued interest or penalties related to income taxes.
	The provision (benefit) for income taxes consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Current Income Taxes:
	Federal	$	3		$	—		$	—
	State	1			—			—
	Deferred Income Taxes:
	Federal	4			(1		)	(3		)
	State	(2		)	—			—
	Benefit from Operating Loss Carryforward	—			(1		)	(1		)
	Change to Valuation Allowance	2			1			1
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	The provision (benefit) for income taxes is reconciled as follows to the federal statutory rate for the years ended December 31 (in millions):
		2014			2013			2012
	Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	$	78		$	75		$	70
	REIT Income not Subject to Federal Tax	(58		)	(69		)	(66		)
	Change to Valuation Allowance	2			1			1
	State Income Tax Expense (Benefit), net of Federal Benefit	(1		)	(1		)	(1		)
	Permanent Book-Tax Differences	(13		)	(7		)	(7		)
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	The federal statutory income tax rate is 35%. The income generated by the activities of the REIT is generally not subject to federal income tax. The permanent book-tax differences consist primarily of differences in cost basis for certain properties contributed (sold for tax purposes) to the taxable REIT subsidiaries that were subsequently sold, in which the tax basis exceeded the book basis.
	Total income tax provision (benefit) was allocated as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	Other Comprehensive Income	(7		)	7			1
	Additional Paid-In Capital (Share-Based Compensation)	—			(1		)	—
	Total Income Tax Provision (Benefit)	$	1		$	5		$	(2	)
	Deferred income taxes are provided for the temporary differences between the financial reporting basis and tax basis for the assets and liabilities of our various wholly-owned taxable REIT subsidiaries. The components of deferred income tax assets and liabilities are as follows at December 31 (in millions):
		2014			2013
	Deferred Income Tax Assets:
	Net Operating Loss Carryforwards	$	12		$	13
	Accrued Compensation	8			9
	Accrued Pension Benefits	16			9
	Timber and Timberlands	15			13
	Accrued Workers' Compensation Benefits	3			4
	Other Accruals and Reserves	6			7
	Valuation Allowance	(12		)	(10		)
		48			45
	Deferred Income Tax Liabilities:
	Machinery and Equipment	(19		)	(19		)
		(19		)	(19		)
	Deferred Income Tax Asset, net	$	29		$	26
	The Operating Partnership has state net operating loss carryforwards for its taxable REIT subsidiaries of $261 million at December 31, 2014, which includes a portion of net operating loss carryfowards related to the REIT (i.e. Plum Creek). REIT net operating losses are generated to the extent the deduction for dividends paid exceeds Plum Creek's taxable income. In certain states, the Operating Partnership files a combined tax return for the REIT and the taxable REIT subsidiaries (a unitary return) and, therefore, may be able to utilize a portion of the REIT's net operating losses. The Operating Partnership's total state net operating loss carryforward deferred income tax asset is $12 million at December 31, 2014. The state net operating loss carryfowards will begin to expire in 2015.
	At December 31, 2014, the Operating Partnership had a valuation allowance of $12 million to reflect the estimated amount of deferred tax assets that may not be realized. The valuation allowance is related to certain state net operating loss carryforwards and other associated deferred tax assets that we do not believe it is more likely than not will be realized in future periods. The determination of the realization of deferred tax assets is based upon management's judgment of various future events and uncertainties, including the timing, nature and amount of future taxable income earned by certain wholly-owned subsidiaries. A valuation allowance is recognized if management believes it is more likely than not that some portion, or all, of the deferred tax asset will not be realized. The Operating Partnership has recorded gross deferred tax assets of $65 million (net of a $12 million valuation allowance) and $61 million (net of a $10 million valuation allowance) as of December 31, 2014 and December 31, 2013, respectively. Management believes that due to the reversal of various taxable temporary differences and/or the planned execution of prudent and feasible tax planning strategies, sufficient taxable income can be generated to utilize the company's remaining deferred tax assets for which a valuation allowance was determined to be unnecessary.
	The net deferred income tax asset is classified on our Consolidated Balance Sheets as follows at December 31 (in millions):
		2014			2013
	Current Deferred Income Tax Asset	$	6		$	9
	Non Current Deferred Income Tax Asset	23			17
	Deferred Income Tax Asset, net	$	29		$	26
	As of December 31, 2014 and December 31, 2013, Plum Creek did not have any liabilities for unrecognized tax benefits. Except as described below, we believe the statute of limitations for tax assessments has expired for all tax years prior to 2010. Plum Creek continues to monitor the progress of ongoing income tax controversies. We do not currently believe there is a reasonable possibility of recording a liability for unrecognized tax benefits within the next twelve months.
	Prior to 2011, Plum Creek was generally subject to corporate-level tax (built-in gains tax) when the Operating Partnership made a taxable disposition of certain properties acquired in a 2001 merger. The built-in gains tax applied to gains recognized from such asset sales to the extent that the fair value of the property exceeded its tax basis at the merger date. Built-in gains tax was generally not payable on dispositions of property to the extent the proceeds from such dispositions were reinvested in qualifying like-kind replacement property.
	Plum Creek's 2008 federal income tax return is currently being audited by the Internal Revenue Service (“IRS”). The IRS has proposed an adjustment to Plum Creek's U.S. federal income tax treatment of the Timberland Venture formation transaction, which occurred on October 1, 2008, on the basis that the transfer of the timberlands to Southern Diversified Timber, LLC was a taxable transaction to Plum Creek at the time of the transfer rather than a nontaxable capital contribution to the Timberland Venture. Plum Creek has filed a protest with IRS Appeals.
	If the IRS's position is upheld on administrative or judicial appeal, it could result in a maximum built-in gains tax liability of approximately $100 million. In addition, Plum Creek could be required to accelerate the distribution to its stockholders of up to $600 million of gain from the transaction. Plum Creek expects that as much as 80% of any such distribution could be made with Plum Creek's common stock, and stockholders would be subject to tax on the distribution at the applicable capital gains tax rate. Plum Creek would also be required to pay interest, which could be substantial, and, if applicable, penalties.
	We believe the transfer of the timberlands was a nontaxable contribution to the Timberland Venture and not a taxable transaction. We have not accrued income taxes for financial reporting purposes with respect to this matter. We are confident in our position and believe that the proposed re-characterization of the Timberland Venture formation transaction by the IRS will ultimately be unsuccessful. We intend to vigorously contest this re-characterization.

REIT_Disclosures

REIT Disclosures (PLUM CREEK TIMBER CO INC [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
REIT Disclosures	REIT DISCLOSURES
	Plum Creek has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code. For the years 2014, 2013 and 2012, Plum Creek elected to designate all distributions as long-term capital gain dividends. As of and for the years ended December 31, 2014, 2013, and 2012, Plum Creek has distributed all of its taxable income. The company has no undistributed capital gain or ordinary income as of December 31, 2014.
	The table below summarizes the historical tax character of distributions to Plum Creek shareholders for the years ended December 31 (amounts per share):
		2014		2013		2012
	Capital Gain Dividend	$	1.76	$	1.74	$	1.68
	Non-Taxable Return of Capital	—		—		—
	Total Distributions	$	1.76	$	1.74	$	1.68

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Borrowings	BORROWINGS
	All of our borrowings, except the Note Payable to Timberland Venture, are made by Plum Creek Timberlands, L.P., the company’s wholly-owned operating partnership (“the Partnership”). Furthermore, all of the outstanding indebtedness of the Partnership is unsecured. Outstanding borrowings consist of the following (in millions):
		December 31, 2014		December 31, 2013
	Line of Credit maturing 2019, 1.34% at 12/31/14, based on LIBOR plus 1.25%	$	95	$	467
	Term Credit Agreement due 2019, 1.67% at 12/31/14, based on LIBOR plus 1.50%.	225		225
	Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11%	439		438
	Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71%	568		568
	Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34%	323		323
	Installment Note Payable due 2023, 5.207%	860		860
	Note Payable to Timberland Venture due 2018, 7.375%	783		783
	Total Long-Term Debt	3,293		3,664
	Less: Current Portion of Long-Term Debt	439		—
	Less: Line of Credit	95		467
	Long-Term Portion	$	2,759	$	3,197
	Line of Credit. The company has a $700 million revolving line of credit agreement that matures on January 15, 2019. The weighted-average interest rate for the borrowings on the line of credit was 1.34% and 1.37% as of December 31, 2014 and December 31, 2013, respectively. The interest rate on the line of credit is currently LIBOR plus 1.25%, including the facility fee. This rate can range from LIBOR plus 1% to LIBOR plus 2% depending on our debt ratings. Subject to customary covenants, the line of credit allows for borrowings from time to time up to $700 million, including up to $60 million of standby letters of credit. Borrowings on the line of credit fluctuate daily based on cash needs. As of December 31, 2014, we had $95 million of borrowings and $2 million of standby letters of credit outstanding; $603 million remained available for borrowing under our line of credit. As of January 2, 2015, all of the borrowings under our line of credit were repaid. The line of credit has been classified as a current liability in our Consolidated Balance Sheet as of December 31, 2014 because the company used its cash as of December 31, 2014 to repay the amount outstanding.
	Term Credit Agreement. The company has a $225 million term credit agreement that matures on April 3, 2019. The interest rate on the term credit agreement was 1.67% and 1.66% as of December 31, 2014 and 2013, respectively. The interest rate on the term credit agreement is based on LIBOR plus 1.50%. After giving effect to patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both December 31, 2014 and 2013. See "Patronage" below. The term loan agreement is subject to covenants that are substantially the same as those of our revolving line of credit. The term credit agreement allows for prepayment of the borrowings at any time prior to the maturity date without premium or penalty.
	Senior Notes. The company has outstanding Senior Notes with various maturities and fixed interest rates. During 2013, the company repaid all of its privately placed borrowings with various lenders ("Private Debt"). See "Debt Principal Payments" below for a discussion of these repayments.
	As of December 31, 2014, the company had publicly issued and outstanding approximately $1.3 billion aggregate principal amount of Senior Notes (“Public Debt”). The Public Debt is issued by the Partnership and is fully and unconditionally guaranteed by Plum Creek Timber Company, Inc. This amount includes $439 million of 5.875% Public Debt which matures in 2015, $569 million of 4.70% Public Debt which matures in 2021 and $325 million of 3.25% Public Debt which matures in 2023.
	The Senior Notes are redeemable prior to maturity; however, they are subject to a premium on redemption, which is based upon interest rates of U.S. Treasury securities having similar average maturities. The premium that would have been due upon early retirement approximated $114 million at December 31, 2014 and $117 million at December 31, 2013.
	Plum Creek Timber Company, Inc. and the Partnership have filed a shelf registration statement with the Securities and Exchange Commission. Under the shelf registration statement, Plum Creek Timber Company, Inc., from time to time, may offer and sell any combination of preferred stock, common stock, depositary shares, warrants and guarantees, and the Partnership may from time to time, offer and sell debt securities. The company intends to maintain a shelf registration statement with respect to such securities.
	Installment Note Payable. The company has an $860 million installment note payable to MWV Community Development and Land Management, LLC ("MWV CDLM") which was issued in connection with the acquisition of certain timberland assets (see Note 2 of the Notes to Consolidated Financial Statements). Following the acquisition, MWV CDLM pledged the installment note to certain banks in the farm credit system. The annual interest rate on the installment note is fixed at 5.207%. After giving effect to patronage distributions, the company's effective net interest rate on the installment note was approximately 4.5% as of both December 31, 2014 and December 31, 2013. See “Patronage” below.
	During the ten-year term of the note, interest is paid semi-annually with the principal due upon maturity. The installment note matures on December 6, 2023, but may be extended at the request of the holder if the company at the time of the request intends to refinance all or a portion of the installment note for a term of five years or more. The installment note is generally not redeemable prior to maturity except in certain limited circumstances and could be subject to a premium on redemption. The installment note is subject to covenants similar to those of our revolving line of credit and term credit agreement.
	Note Payable to Timberland Venture. The company has a $783 million note payable to a timberland venture (a related party). The annual interest rate on the note payable is fixed at 7.375%. During the ten-year term of the note, interest is paid quarterly with the principal due upon maturity. The note matures on October 1, 2018 but may be extended until October 1, 2020 at the election of Plum Creek. The note is not redeemable prior to maturity. The note is structurally subordinated to all other indebtedness of the company at December 31, 2014. See Note 18 of the Notes to Consolidated Financial Statements.
	Patronage. The company receives patronage refunds under the term credit agreement and the installment note payable. Patronage refunds are distributions of profits from banks in the farm credit system, which are cooperatives that are required to distribute profits to their members. Patronage distributions, which are made in either cash or stock, are received in the year after they were earned. The company earned approximately $8 million of patronage during 2014. The company earned approximately $3 million of patronage during 2013. Patronage refunds are recorded as a reduction to interest expense in the year earned.
	Debt Principal Payments. The table below summarizes the debt principal payments made for the years ended December 31 (in millions):
		2014		2013
	Public Debt	$	—	$	24
	Private Debt	—		260
	Term Credit Agreement	—		225
	Total	$	—	$	509
	During 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income.
	Debt Maturities. The aggregate maturities on all debt agreements are as follows as of December 31, 2014 (in millions):
	Maturity	Debt		Note		Total
		Agreements		Payable to
				Timberland
				Venture
	2015	$	439	$	—	$	439
	2016	—		—		—
	2017	—		—		—
	2018	—		783		783
	2019	320		—		320
	Thereafter	1,754		—		1,754
	Total	$	2,513	$	783	$	3,296
	Debt Covenants. The company's debt agreements contain various restrictive covenants, including requiring that we maintain certain interest coverage and maximum leverage ratios. The company’s term loan, revolving line of credit and installment note payable each contain a covenant restricting our ability to make any restricted payments, which includes dividend payments, if we are in default under our debt agreements. The company was in compliance with all of its borrowing agreement covenants as of December 31, 2014.
PLUM CREEK TIMBERLANDS L P [Member]
Borrowings	BORROWINGS
	Outstanding borrowings of the Operating Partnership, all of which are unsecured, consist of the following (in millions):
		December 31, 2014		December 31, 2013
	Line of Credit maturing 2019, 1.34% at 12/31/14, based on LIBOR plus 1.25%	$	95	$	467
	Term Credit Agreement due 2019, 1.67% at 12/31/14, based on LIBOR plus 1.50%.	225		225
	Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11%	439		438
	Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71%	568		568
	Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34%	323		323
	Installment Note Payable due 2023, 5.207%	860		860
	Total Long-Term Debt	2,510		2,881
	Less: Current Portion of Long-Term Debt	439		—
	Less: Line of Credit	95		467
	Long-Term Portion	$	1,976	$	2,414
	Line of Credit. The Operating Partnership has a $700 million revolving line of credit agreement that matures on January 15, 2019. The weighted-average interest rate for the borrowings on the line of credit was 1.34% and 1.37% as of December 31, 2014 and December 31, 2013, respectively. The interest rate on the line of credit is currently LIBOR plus 1.25%, including the facility fee. This rate can range from LIBOR plus 1% to LIBOR plus 2% depending on our debt ratings. Subject to customary covenants, the line of credit allows for borrowings from time to time up to $700 million, including up to $60 million of standby letters of credit. Borrowings on the line of credit fluctuate daily based on cash needs. As of December 31, 2014, we had $95 million of borrowings and $2 million of standby letters of credit outstanding; $603 million remained available for borrowing under our line of credit. As of January 2, 2015, all of the borrowings under our line of credit were repaid. The line of credit has been classified as a current liability in our Consolidated Balance Sheet as of December 31, 2014 because the Operating Partnership used its cash as of December 31, 2014 to repay the amount outstanding.
	Term Credit Agreement. The Operating Partnership has a $225 million term credit agreement that matures on April 3, 2019. The interest rate on the term credit agreement was 1.67% and 1.66% as of December 31, 2014 and 2013, respectively. The interest rate on the term credit agreement is based on LIBOR plus 1.50%. After giving effect to patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both December 31, 2014 and 2013. See "Patronage" below. The term loan agreement is subject to covenants that are substantially the same as those of our revolving line of credit. The term credit agreement allows for prepayment of the borrowings at any time prior to the maturity date without premium or penalty.
	Senior Notes. The Operating Partnership has outstanding Senior Notes with various maturities and fixed interest rates. During 2013, the Operating Partnership repaid all of its privately placed borrowings with various lenders ("Private Debt"). See "Debt Principal Payments" below for a discussion of these repayments.
	As of December 31, 2014, the Operating Partnership had publicly issued and outstanding approximately $1.3 billion aggregate principal amount of Senior Notes (“Public Debt”). The Public Debt is issued by the Partnership and is fully and unconditionally guaranteed by Plum Creek Timber Company, Inc. This amount includes $439 million of 5.875% Public Debt which matures in 2015, $569 million of 4.70% Public Debt which matures in 2021 and $325 million of 3.25% Public Debt which matures in 2023.
	The Senior Notes are redeemable prior to maturity; however, they are subject to a premium on redemption, which is based upon interest rates of U.S. Treasury securities having similar average maturities. The premium that would have been due upon early retirement approximated $114 million at December 31, 2014 and $117 million at December 31, 2013.
	Plum Creek Timber Company, Inc. and the Operating Partnership have filed a shelf registration statement with the Securities and Exchange Commission. Under the shelf registration statement, Plum Creek Timber Company, Inc., from time to time, may offer and sell any combination of preferred stock, common stock, depositary shares, warrants and guarantees, and the Operating Partnership may from time to time, offer and sell debt securities. Plum Creek and the Operating Partnership intend to maintain a shelf registration statement with respect to such securities.
	Installment Note Payable. The Operating Partnership has an $860 million installment note payable to MWV Community Development and Land Management, LLC ("MWV CDLM") which was issued in connection with the acquisition of certain timberland assets (see Note 2 of the Notes to Consolidated Financial Statements). Following the acquisition, MWV CDLM pledged the installment note to certain banks in the farm credit system. The annual interest rate on the installment note is fixed at 5.207%. After giving effect to patronage distributions, the Operating Partnership's effective net interest rate on the installment note was approximately 4.5% as of both December 31, 2014 and December 31, 2013. See "Patronage" below.
	During the ten-year term of the note, interest is paid semi-annually with the principal due upon maturity. The installment note matures on December 6, 2023, but may be extended at the request of the holder if the Operating Partnership at the time of the request intends to refinance all or a portion of the installment note for a term of five years or more. The installment note is generally not redeemable prior to maturity except in certain limited circumstances and could be subject to a premium on redemption. The installment note is subject to covenants similar to those of our revolving line of credit and term credit agreement.
	Patronage. The Operating Partnership receives patronage refunds under the term credit agreement and the installment note payable. Patronage refunds are distributions of profits from banks in the farm credit system, which are cooperatives that are required to distribute profits to their members. Patronage distributions, which are made in either cash or stock, are received in the year after they were earned. The Operating Partnership earned approximately $8 million of patronage during 2014. The Operating Partnership earned approximately $3 million of patronage during 2013. Patronage refunds are recorded as a reduction to interest expense in the year earned.
	Debt Principal Payments. The table below summarizes the debt principal payments made for the years ended December 31 (in millions):
		2014		2013
	Public Debt	$	—	$	24
	Private Debt	—		260
	Term Credit Agreement	—		225
	Total	$	—	$	509
	During 2013, the Operating Partnership prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income.
	Debt Maturities. The aggregate maturities on all debt agreements are as follows as of December 31, 2014 (in millions):
	Maturity	Debt Agreements
	2015	$	439
	2016	—
	2017	—
	2018	—
	2019	320
	Thereafter	1,754
	Total	$	2,513
	Debt Covenants. The Operating Partnership's debt agreements contain various restrictive covenants, including requiring that we maintain certain interest coverage and maximum leverage ratios. The Operating Partnership’s term loan, revolving line of credit and installment note payable each contain a covenant restricting our ability to make any restricted payments, which includes dividend payments, if we are in default under our debt agreements. The Operating Partnership was in compliance with all of its borrowing agreement covenants as of December 31, 2014.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Fair Value Measurements	FAIR VALUE MEASUREMENTS
	Assets and Liabilities Measured at Fair Value on a Recurring Basis. The company’s fair value measurements of its cash equivalents, available-for-sale securities, and trading securities, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the company’s financial statements at fair value, measured on a recurring basis (in millions):
		Balance at			Fair Value Measurements
		31-Dec-14			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	90		$	90
	Available-for-Sale Securities (B)	43			43
	Trading Securities (B)	5			5
	Total	$	138		$	138
		Balance at			Fair Value Measurements
		31-Dec-13			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	428		$	428
	Available-for-Sale Securities (B)	40			40
	Trading Securities (B)	5			5
	Total	$	473		$	473
	(A)	Consists of several money market funds and is included in the $92 million and $433 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013, respectively.
	(B)	Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013. At December 31, 2014, investments in these mutual funds were approximately 45% in domestic (U.S.) equities, 25% in international equities and 30% in debt securities.
	Available-for-Sale Securities. Certain investments in the grantor trusts relate to the company's non-qualified pension plans and are classified as available-for-sale securities. The company has invested in various money market, debt and equity mutual funds and plans to use these investments to fund its non-qualified pension obligations. Unrealized holding gains and losses are included as a component of accumulated other comprehensive income. The company records changes in unrealized holding gains and losses in Other Comprehensive Income, unless an other than temporary impairment has occurred, which is then charged to expense. Changes in the fair value of available-for-sale securities were not material to the company's financial position or results of operations for the years ended December 31, 2014 and December 31, 2013. As of December 31, 2014 and 2013, the amortized cost of the available-for-sale securities was approximately $31 million and $28 million, respectively. See Note 13 of the Notes to Consolidated Financial Statements.
	Trading Securities. Certain investments in the grantor trusts relate to the company's deferred compensation plans and are classified as trading securities. Deferred compensation amounts are invested in various money market, debt and equity mutual funds. The company plans to use these investments to fund deferred compensation obligations. Realized gains and losses and changes in unrealized gains and losses (and a corresponding amount of compensation expense) are recognized in the company's Consolidated Statements of Income. Deferred compensation obligations are included in Other Liabilities and were $5 million at both December 31, 2014 and 2013. Changes in the fair value of trading securities were not material to the company's financial position or results of operations for the years ended December 31, 2014 and December 31, 2013.
	Other Instruments. Summarized below are the carrying amount and fair value of the company's debt (estimated using the discounted cash flow method) along with the categorization under the fair value hierarchy in the Accounting Standards Codification (in millions):
						Fair Value at December 31, 2014
			Carrying Amount at December 31, 2014			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,330		$	—	$	1,398	$	—	$	1,398
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		95			—		95		—		95
	Installment Note Payable (D)		860			—		906		—		906
	Note Payable to Timberland Venture (E)		783			—		—		892		892
	Total Debt		$	3,293		$	—	$	2,624	$	892	$	3,516
						Fair Value at December 31, 2013
			Carrying Amount at December 31, 2013			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,329		$	—	$	1,361	$	—	$	1,361
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		467			—		467		—		467
	Installment Note Payable (D)		860			—		845		—		845
	Note Payable to Timberland Venture (E)		783			—		—		916		916
	Total Debt		$	3,664		$	—	$	2,898	$	916	$	3,814
	(A)	Fair value of the company's Public Debt (publicly issued Senior Notes) is estimated using multiple market quotes for the company's public bonds.
	(B)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable debt.
	(C)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable credit lines.
	(D)	Fair value is estimated by adjusting the spread over the applicable Treasury rate to a current market quote for comparable debt.
	(E)	Fair value is estimated by using market quotes for the company's Public Debt adjusted by an estimated risk premium for holding company debt and the different maturity.
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. The company’s fair value measurements of its assets and liabilities, measured on a nonrecurring basis, are categorized as Level 3 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 3 valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Summarized below are the Level 3 assets reported in the company's financial statements at fair value, measured on a nonrecurring basis, during the years ended December 31 (in millions):
		2014		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (A)	$46		$46	($7)
	Total				($7)
		2013		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
(Level 3 Measurements)
Timberlands Held for Sale (B)	$37		$37	($4)
Total				($4)
(A)	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
(B)	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value Measurements	FAIR VALUE MEASUREMENTS
	Assets and Liabilities Measured at Fair Value on a Recurring Basis. The Operating Partnership’s fair value measurements of its cash equivalents, available-for-sale securities, and trading securities, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the Operating Partnership’s financial statements at fair value, measured on a recurring basis (in millions):
		Balance at			Fair Value Measurements
		31-Dec-14			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	90		$	90
	Available-for-Sale Securities (B)	43			43
	Trading Securities (B)	5			5
	Total	$	138		$	138
		Balance at			Fair Value Measurements
		31-Dec-13			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	428		$	428
	Available-for-Sale Securities (B)	40			40
	Trading Securities (B)	5			5
	Total	$	473		$	473
	(A)	Consists of several money market funds and is included in the $92 million and $433 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013, respectively.
	(B)	Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013. At December 31, 2014, investments in these mutual funds were approximately 45% in domestic (U.S.) equities, 25% in international equities and 30% in debt securities.
	Available-for-Sale Securities. Certain investments in the grantor trusts relate to the Operating Partnership's non-qualified pension plans and are classified as available-for-sale securities. The Operating Partnership has invested in various money market, debt and equity mutual funds and plans to use these investments to fund its non-qualified pension obligations. Unrealized holding gains and losses are included as a component of accumulated other comprehensive income. The Operating Partnership records changes in unrealized holding gains and losses in Other Comprehensive Income, unless an other than temporary impairment has occurred, which is then charged to expense. Changes in the fair value of available-for-sale securities were not material to the Operating Partnership's financial position or results of operations for the years ended December 31, 2014 and December 31, 2013. As of December 31, 2014 and 2013, the amortized cost of the available-for-sale securities was approximately $31 million and $28 million, respectively. See Note 11 of the Notes to Consolidated Financial Statements.
	Trading Securities. Certain investments in the grantor trusts relate to the Operating Partnership's deferred compensation plans and are classified as trading securities. Deferred compensation amounts are invested in various money market, debt and equity mutual funds. The Operating Partnership plans to use these investments to fund deferred compensation obligations. Realized gains and losses and changes in unrealized gains and losses (and a corresponding amount of compensation expense) are recognized in the Operating Partnership's Consolidated Statements of Income. Deferred compensation obligations are included in Other Liabilities and were $5 million at both December 31, 2014 and 2013. Changes in the fair value of trading securities were not material to the Operating Partnership's financial position or results of operations for the years ended December 31, 2014 and December 31, 2013.
	Other Instruments. Summarized below are the carrying amount and fair value of the Operating Partnership's debt (estimated using the discounted cash flow method) along with the categorization under the fair value hierarchy in the Accounting Standards Codification (in millions):
						Fair Value at December 31, 2014
			Carrying Amount at December 31, 2014			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,330		$	—	$	1,398	$	—	$	1,398
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		95			—		95		—		95
	Installment Note Payable (D)		860			—		906		—		906
	Total Debt		$	2,510		$	—	$	2,624	$	—	$	2,624
						Fair Value at December 31, 2013
			Carrying Amount at December 31, 2013			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,329		$	—	$	1,361	$	—	$	1,361
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		467			—		467		—		467
	Installment Note Payable (D)		860			—		845		—		845
	Total Debt		$	2,881		$	—	$	2,898	$	—	$	2,898
	(A)	Fair value of the Operating Partnership's Public Debt (publicly issued Senior Notes) is estimated using multiple market quotes for the Operating Partnership's public bonds.
	(B)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable debt.
	(C)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable credit lines.
	(D)	Fair value is estimated by adjusting the spread over the applicable Treasury rate to a current market quote for comparable debt.
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. The Operating Partnership’s fair value measurements of its assets and liabilities, measured on a nonrecurring basis, are categorized as Level 3 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 3 valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Summarized below are the Level 3 assets reported in the Operating Partnership's financial statements at fair value, measured on a nonrecurring basis, during the years ended December 31 (in millions):
		2014		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (A)	$46		$46	($7)
	Total				($7)
		2013		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (B)	$37		$37	($4)
	Total				($4)
(A)	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
(B)	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.

Stockholders_Equity

Stockholders' Equity (PLUM CREEK TIMBER CO INC [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Stockholders' Equity	STOCKHOLDERS' EQUITY
	At December 31, 2014, Plum Creek had the following authorized capital of which 175.9 million shares of common stock were issued and outstanding:
	•	300,634,566 shares of common stock, par value $.01 per share;
	•	150,000,001 shares of excess stock, par value $.01 per share; and
	•	75,000,000 shares of preferred stock, par value $.01 per share.
	On November 4, 2013, the company completed an equity offering, resulting in the issuance of 13.9 million additional shares of common stock for net proceeds of $607 million. The proceeds from the equity offering were used to pay the cash portion of the timberland acquisition from MeadWestvaco Corporation and the acquisition related transaction fees, with the balance used to pay down approximately $376 million of the company's outstanding debt. See Note 2 of the Notes to Consolidated Financial Statements.
	The Board of Directors, from time to time, has authorized a share repurchase program. The table below summarizes the share repurchases pursuant to this program for the year ended December 31:
			2014
	Shares of Common Stock (in millions)		1.2
	Total Cost of Shares (in millions)		$	50
	Average Cost per Share		$	40.21
	There were no share repurchases pursuant to the Board of Directors authorized share repurchase program in 2013 or 2012. At December 31, 2014, $125 million is available for share repurchases under the current Board of Directors authorization.
	Comprehensive Income
	Comprehensive income includes net income, actuarial gains and losses associated with our defined benefit pension plans, unrealized gains and losses on available-for-sale securities and a gain for the effective portion of a derivative transaction designated as a cash flow hedge. Comprehensive income was as follows for the years ended December 31 (in millions):
			Pretax			Tax Expense			After-Tax
			Amount			(Benefit)			Amount
	December 31, 2012
	Net Income								$	203
	Unrealized Holding Gains (Losses)		$	2		$	—		2
	Defined Benefit Plans:
	Actuarial Gain (Loss)		(2		)	—			(2		)
	Reclassification to Net Income		4			1			3
	Total Comprehensive Income								$	206
	December 31, 2013
	Net Income								$	214
	Unrealized Holding Gains (Losses)		$	5		$	—		5
	Defined Benefit Plans:
	Actuarial Gain (Loss)		25			6			19
	Reclassification to Net Income		5			1			4
	Derivative Gain (Loss) on Cash Flow Hedge		5			—			5
	Total Comprehensive Income								$	247
	December 31, 2014
	Net Income								$	214
	Unrealized Holding Gains (Losses)		$	1		$	—		1
	Defined Benefit Plans:
	Actuarial Gain (Loss)		(34		)	(7		)	(27		)
	Reclassification to Net Income		2			—			2
	Derivative Instruments:
	Amortization of Gain Reclassified to Interest Expense		—			—			—
	Total Comprehensive Income								$	190
	The components of accumulated other comprehensive income, net of tax, were as follows at December 31 (in millions):
			Net Unrealized Holding Gain (Loss)			Defined Benefit Plan Actuarial Net Loss			Gain on Cash Flow Hedge			Total
	31-Dec-12		$	8		$	(40	)	$	—		$	(32	)
	Other Comprehensive Income (Loss) before Reclassifications		5			19			5			29
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)		—			4			—			4
	31-Dec-13		$	13		$	(17	)	$	5		$	1
	Other Comprehensive Income (Loss) before Reclassifications		1			(27		)	—			(26		)
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)		—			2			—			2
	31-Dec-14		$	14		$	(42	)	$	5		$	(23	)
	(A)	Amortization of actuarial gains and losses on the company's defined benefit pension plans is included in the computation of pension cost. See Note 14 of the Notes to Consolidated Financial Statements.
	Cash Flow Hedge. On December 6, 2013, the company issued an $860 million installment note to MWV Community Development and Land Management, LLC ("MWV CDLM") in connection with the acquisition of certain timberland assets (see Notes 2 and 11 of the Notes to Consolidated Financial Statements). To hedge against interest rate risk, the company entered into several forward treasury lock transactions following the announcement of the acquisition on October 28, 2013. These transactions, which were executed prior to issuance of the installment note, are accounted for as cash flow hedges. These transactions settled on December 6, 2013, the date the installment note was issued, and the company received proceeds of $5 million that are reflected in Other Operating Activities on the Consolidated Statements of Cash Flows. The company recorded a gain of $5 million, the effective portion of the hedge, in Other Comprehensive Income. This gain is being amortized as a reduction to interest expense on the installment note over its term of ten years. The company is not a party to any other derivative arrangements.

Partners_Capital

Partners' Capital (PLUM CREEK TIMBERLANDS L P [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBERLANDS L P [Member]
Partners' Capital	PARTNERS' CAPITAL
	During 2008, PC Ventures I, LLC (“PC Ventures”), a 100% wholly-owned subsidiary of Plum Creek Timber Company, Inc., borrowed $783 million from an entity in which a subsidiary of the Operating Partnership has an equity interest (the Timberland Venture). See Note 16 of the Notes to Consolidated Financial Statements. PC Ventures used the proceeds from the borrowing to make a $783 million capital contribution to the Operating Partnership in exchange for a Series T-1 Redeemable Preferred Limited Partnership Interest in the Operating Partnership (“Series T-1 Preferred Interest”). The Operating Partnership has no ownership interest in PC Ventures.
	The Series T-1 Preferred Interest provides for a return of 7.375% per annum (approximately $58 million) on its contributed capital of $783 million. Distributions are payable on February 15th, May 15th, August 15th, and November 15th each year. The Series T-1 Preferred Interest is redeemable upon liquidation of the Operating Partnership. The Series T-1 Preferred Interest has a preference in liquidation over the Common Partnership Interests (Partners’ Capital) to the extent the Operating Partnership has available assets to distribute to the Series T-1 Preferred Interest.
	On November 4, 2013, Plum Creek completed an equity offering, resulting in the issuance of 13.9 million additional shares of common stock for net proceeds of $607 million. Following the equity offering, Plum Creek made a $607 million capital contribution to the Operating Partnership. The proceeds from this capital contribution were used by the Operating Partnership to pay the cash portion of the timberland acquisition from MeadWestvaco Corporation and the acquisition related transaction fees, with the balance used to pay down approximately $376 million of the Operating Partnership’s outstanding debt. See Note 2 of the Notes to Consolidated Financial Statements.
	Comprehensive Income
	Comprehensive income includes net income, actuarial gains and losses associated with our defined benefit pension plans, unrealized gains and losses on available-for-sale securities and a gain for the effective portion of a derivative transaction designated as a cash flow hedge. Comprehensive income was as follows for the years ended December 31 (in millions):
		Pretax			Tax Expense			After-Tax
		Amount			(Benefit)			Amount
	December 31, 2012
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	261
	Unrealized Holding Gains (Losses)	$	2		$	—		2
	Defined Benefit Plans:
	Actuarial Gain (Loss)	(2		)	—			(2		)
	Reclassification to Net Income	4			1			3
	Total Comprehensive Income							$	264
	December 31, 2013
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	272
	Unrealized Holding Gains (Losses)	$	5		$	—		5
	Defined Benefit Plans:
	Actuarial Gain (Loss)	25			6			19
	Reclassification to Net Income	5			1			4
	Derivative Gain (Loss) on Cash Flow Hedge	5			—			5
	Total Comprehensive Income							$	305
	December 31, 2014
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	272
	Unrealized Holding Gains (Losses)	$	1		$	—		1
	Defined Benefit Plans:
	Actuarial Gain (Loss)	(34		)	(7		)	(27		)
	Reclassification to Net Income	2			—			2
	Derivative Instruments:
	Amortization of Gain Reclassified to Interest Expense	—			—			—
	Total Comprehensive Income							$	248
	The components of accumulated other comprehensive income, net of tax, were as follows at December 31 (in millions):
		Net Unrealized Holding Gain (Loss)			Defined Benefit Plan Actuarial Net Loss			Gain on Cash Flow Hedge			Total
	31-Dec-12	$	8		$	(40	)	$	—		$	(32	)
	Other Comprehensive Income (Loss) before Reclassifications	5			19			5			29
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)	—			4			—			4
	31-Dec-13	$	13		$	(17	)	$	5		$	1
	Other Comprehensive Income (Loss) before Reclassifications	1			(27		)	—			(26		)
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)	—			2			—			2
	31-Dec-14	$	14		$	(42	)	$	5		$	(23	)
	(A)    Amortization of actuarial gains and losses on the Operating Partnership’s defined benefit pension plans is
	included in the computation of pension cost. See Note 12 of the Notes to Consolidated Financial Statements.
	Cash Flow Hedge. On December 6, 2013, the Operating Partnership issued an $860 million installment note to MWV Community Development and Land Management, LLC ("MWV CDLM") in connection with the acquisition of certain timberland assets (see Notes 2 and 9 of the Notes to Consolidated Financial Statements). To hedge against interest rate risk, the Operating Partnership entered into several forward treasury lock transactions following the announcement of the acquisition on October 28, 2013. These transactions, which were executed prior to issuance of the installment note, are accounted for as cash flow hedges. These transactions settled on December 6, 2013, the date the installment note was issued, and the Operating Partnership received proceeds of $5 million that are reflected in Other Operating Activities on the Consolidated Statements of Cash Flows. The Operating Partnership recorded a gain of $5 million, the effective portion of the hedge, in Other Comprehensive Income. This gain is being amortized as a reduction to interest expense on the installment note over its term of ten years. The Operating Partnership is not a party to any other derivative arrangements.

Employee_Pension_and_Retiremen

Employee Pension and Retirement Plans	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Employee Pension and Retirement Plans	EMPLOYEE PENSION AND RETIREMENT PLANS
	Pension Plan—General. The company provides defined benefit pension plans that cover substantially all employees of the company. Most of the company’s salaried and all hourly employees who complete one year of service in which they work at least 1,000 hours are eligible to participate in the plan. Participants vest after three years of service. The cash balance benefits for salaried employees are determined based primarily on certain percentages of compensation, age, years of service and interest accrued based on the 30-year Treasury bond rate. Participants who were employees of the company on September 1, 2000, earn benefits based on the greater of the cash balance formula or a monthly pension benefit that is principally based on the highest monthly average earnings during any consecutive sixty-month out of 120-month period and the number of years of service credit. The benefits to hourly employees are generally based on a fixed amount per year of service.
	The company maintains a qualified defined benefit pension plan and two non-qualified defined benefit pension plans. Assets related to the non-qualified plans are held in a grantor trust and are subject to the claims of creditors in the event of bankruptcy. As a result, pension assets for the non-qualified plans are not considered plan assets, and therefore, have not been netted against our pension liability. Pension assets for the non-qualified plans are included in “Investment in Grantor Trusts” and the related pension liability is included in “Other Current Liabilities” and “Other Liabilities” in our Consolidated Balance Sheets.
	Funded Status. The following table provides a reconciliation of benefit obligations, plan assets, and funded status of the plans for the years ended December 31 (in millions):
			2014				2013
	Change in Benefit Obligation
	Benefit Obligation at Beginning of Period		$	178			$	181
	Service Cost		7				7
	Interest Cost		8				8
	Actuarial (Gain) Loss		32				(12		)
	Benefits Paid		(7		)		(6		)
	Benefit Obligation at End of Period		$	218			$	178
	Change in Plan Assets
	Fair Value of Plan Assets at Beginning of Period		$	144			$	128
	Actual Return on Plan Assets		7				22
	Employer Contributions		10				—
	Benefits Paid		(7		)		(6		)
	Fair Value of Plan Assets at End of Period		154				144
	Funded Status—December 31		$	(64	)		$	(34	)
	Amounts Recognized in the Consolidated Balance Sheet
	Other Assets		$	—			$	10
	Other Current Liabilities		(5		)		(5		)
	Other Liabilities		(59		)		(39		)
	Total		$	(64	)		$	(34	)
	Note: The Benefit Obligation reflects both the qualified and non-qualified plans while the Plan Assets reflects only the qualified plan. The actuarial loss reflected in the change in benefit obligation for 2014 is due primarily to a change in the interest rate assumptions (decreased discount rates) for measuring our pension liabilities as of December 31, 2014, and to a lesser extent, a change in our mortality assumptions (plan participants are living longer). The actuarial gain reflected in the change in benefit obligation for 2013 is due primarily to a change in the interest rate assumptions (increased discount rates) for measuring our pension liabilities as of December 31, 2013.
	The following table sets forth the benefit obligation, accumulated benefit obligation, plan assets, and assets held in the grantor trust for the qualified and non-qualified pension plans as of December 31 (in millions):
			Qualified Pension Plan								Non-Qualified Pension Plans
			2014				2013				2014			2013
	Projected Benefit Obligation		$	164			$	134			$	54		$	44
	Accumulated Benefit Obligation		154				126				45			36
	Plan Assets		154				144				N/A			N/A
	Assets Held in the Grantor Trust		N/A				N/A				43			40
	Pension contributions are significantly impacted by investment returns and changes in interest rates. It is generally the company’s policy to fund the qualified plan annually such that the fair value of plan assets equals or exceeds the actuarially computed accumulated benefit obligation (the approximate actuarially computed current pension obligation if the plan was discontinued) over a market cycle (generally 3 to 5 years). During 2014, the company contributed $9 million to the qualified pension plan and contributed $1 million to its grantor trust associated with the non-qualified plans. During 2013, the company did not make any contributions to the qualified pension plan or to its grantor trust associated with the non-qualified plans. Based on current interest rates and expected returns, the company expects 2015 contributions to the qualified pension plan to range between $4 million and $8 million. During 2015, the company expects to contribute between $1 million and $4 million to its grantor trust associated with the non-qualified plans.
	Pension Cost and Assumptions. The components of pension cost recognized in net income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Service Cost		$	7			$	7			$	6
	Interest Cost		8				8				8
	Expected Return on Plan Assets		(9		)		(9		)		(7		)
	Recognized Actuarial Loss		2				5				4
	Total Pension Cost		$	8			$	11			$	11
	The components of pension cost recognized in comprehensive income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Net Actuarial Loss (Gain)		$	34			$	(25	)		$	2
	Amortization of Net Actuarial Loss		(2		)		(5		)		(4		)
	Total (Gain) Loss Recognized in Other Comprehensive Income		$	32			$	(30	)		$	(2	)
	Combined Pension Cost Recognized in Comprehensive Income		$	40			$	(19	)		$	9
	Amounts included in accumulated other comprehensive income are as follows as of December 31 (in millions):
			2014				2013
	Net Loss		$	54			$	22
	Deferred Tax Benefit		$	(13	)		$	(6	)
	During 2015, the company expects $4 million of the $54 million net actuarial loss to be included as a component of our total pension cost.
	The qualified pension plan allows terminated employees to elect to receive pension benefits either as a lump-sum distribution or as annuity payments. The non-qualified plans only provide for lump-sum distributions. Management estimates that approximately half of the qualified plan participants will elect a lump-sum payment upon termination. Therefore, approximately 50% of the benefit obligation for the qualified plan is discounted based on high quality corporate bond yields while approximately 50% of the qualified plan and 100% of the non-qualified plans are discounted based on yields on 30-year U.S. Treasury bonds. Weighted-average assumptions used to determine benefit obligation are as follows:
			December 31, 2014			December 31, 2013
	Discount Rates
	Annuity Distributions		4.15	%		5.05	%
	Lump-Sum Distributions		3.04	%		3.8	%
	Rate of Compensation Increase		3.45	%		3.45	%
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
			2014			2013			2012
	Discount Rate		5.05	%		4.35	%		4.95	%
	Expected Long-Term Return on Plan Assets		7.25	%		7.25	%		7.5	%
	Rate of Compensation Increase		3.45	%		3.45	%		3.45	%
	To develop the expected long-term rate of return on plan assets assumption, the company considered the current level of expected returns on risk-free investments (primarily government bonds), the historical level of the risk premium associated with the other asset classes in which the portfolio is invested and the expectations for future returns on each asset class. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected long-term rate of return on plan assets assumption for the portfolio. This resulted in the selection of the 7.25% assumption as of January 1, 2014 and as of January 1, 2013.
	The market related value of plan assets for the qualified plan is a calculated value that spreads unexpected investment returns over three years. The market-related value of assets held in a grantor trust for the non-qualified plans is fair market value. The market-related values are used to determine the amount of net actuarial loss/gain which is recognized as a component of pension cost. There has been no change in the method for determining the market-related value of assets since the prior valuation.
The benefit obligation and net periodic pension cost are impacted by assumptions for plan participants' life expectancies. In determining the benefit obligation at December 31, 2014, the company updated its mortality assumptions to reflect increased life expectancies. The updated mortality assumptions did not impact the 2014 net periodic pension cost and will not significantly impact future net periodic pension costs.
Investment Policies and Strategies. Investment allocation decisions are made to achieve maximum returns at a reasonable risk for the company’s pension assets over a full market cycle and are made without regard to future pension obligations. At December 31, 2014, target allocations for the various asset classes are as follows:
Large Capitalization Domestic Equities	32		%
Small and Mid-Size Capitalization Domestic Equities	7		%
International Equities	26		%
Fixed Income	35		%
The company currently uses actively managed funds and index funds, utilizing seven fund managers, to capture favorable returns in various asset classes and to diversify risk. All asset classes are invested in a diversified portfolio and fund managers are expected to be well diversified with respect to company, industry and economic sectors. Equity investments consist primarily of common stocks, common stock equivalents and preferred stock. Fixed income investments consist primarily of investments in U.S. treasuries, agencies of the U.S. Government, corporations, municipalities, banks, foreign bonds and other financial institutions. Pension assets are analyzed at least quarterly and rebalanced as needed to maintain the target allocations.
Over a full market cycle, the investment goals (net of related fees) for the company’s various asset classes are as follows:
•	Large Cap. Domestic Equities—For actively managed funds performance should exceed the applicable benchmark (e.g., Russell 1000 Growth or Russell 1000 Value Indexes) by 0.50% per annum, while index funds should match the performance of the applicable benchmark (e.g. S&P 500 Index).
•	Small and Mid. Cap. Domestic Equities—For index funds performance should match the applicable benchmark (e.g. Russell 2000 Index).
•	International Equities—For actively managed funds performance should exceed the applicable benchmark (e.g. MSCI EAFE Index) by 1.00% per annum, while index funds should match the performance of the applicable benchmark (e.g. MSCI Emerging Markets Index).
•	Fixed Income Securities—Fund performance should exceed the applicable benchmark (e.g., Barclays Capital Aggregate Bond, Barclays Capital High Yield, or Barclays Capital U.S. Credit Indexes) by 0.25% per annum.
Fair Value of Pension Plan Assets. The fair values of each major class of plan assets were as follows as of December 31, 2014 (in millions):
		Quoted Prices				Significant				Total
		In Active				Observable
		Markets for				Inputs
		Identical Assets				(Level 2)
		(Level 1)
Money Market Funds		$	1			$	—			$	1
Mutual Funds invested in:
Large Cap. Domestic Equity Securities		16				—				16
Small and Mid. Cap. Domestic Equity Securities		11				—				11
International Equity Securities		40				—				40
Fixed Income Securities		8				—				8
Collective Trust Funds invested in:
Large Cap. Domestic Equity Securities		—				34				34
Fixed Income Securities		—				8				8
Limited Partnership Interest invested in:
Fixed Income Securities		—				36				36
Total Investments Measured at Fair Value		$	76			$	78			$	154
The fair values of each major class of plan assets were as follows as of December 31, 2013 (in millions):
		Quoted Prices				Significant				Total
		In Active				Observable
		Markets for				Inputs
		Identical Assets				(Level 2)
		(Level 1)
Money Market Funds		$	—			$	—			$	—
Mutual Funds invested in:
Large Cap. Domestic Equity Securities		16				—				16
Small and Mid. Cap. Domestic Equity Securities		11				—				11
International Equity Securities		38				—				38
Fixed Income Securities		40				—				40
Collective Trust Funds invested in:
Large Cap. Domestic Equity Securities		—				32				32
Fixed Income Securities		—				7				7
Total Investments Measured at Fair Value		$	105			$	39			$	144
The valuation techniques and inputs used to measure fair value for each major class of plan assets were as follows (there have been no changes in these techniques and inputs during the year ended December 31, 2014):
•	The fair value of mutual funds is derived from quoted market prices in active markets at the measurement date.
•	The fair value of the underlying assets of the collective trust funds and limited partnership interest is determined using the net asset values. The net asset values are based on the fair value of the underlying assets, minus their liabilities, and then divided by the number of units outstanding at the valuation date. The unit price is based primarily on observable market data of the fund’s underlying assets.
Projected Benefit Payments. The following table presents expected future benefit payments projected based on the same assumptions used by the company to measure the benefit obligation and estimate future employee service (in millions):
Year		Projected Benefit
		Payments
2015		$	17
2016		18
2017		27
2018		15
2019		16
2020 through 2024		78
Thrift and Profit Sharing Plan. The company sponsors an employee thrift and profit sharing plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all full-time employees. The company matches employee contributions of up to six percent of compensation at rates ranging from 35% to 100%, depending upon financial performance.
The employer match was 100% for 2014, 2013 and 2012. Amounts charged to expense relating to the company’s thrift and profit sharing plan were $5 million in 2014 and $4 million in 2013 and 2012.
PLUM CREEK TIMBERLANDS L P [Member]
Employee Pension and Retirement Plans	EMPLOYEE PENSION AND RETIREMENT PLANS
	Pension Plan—General. Plum Creek Timberlands, L.P. sponsors defined benefit pension plans that cover substantially all employees of the Operating Partnership. Most of the Operating Partnership’s salaried and all hourly employees who complete one year of service in which they work at least 1,000 hours are eligible to participate in the plan. Participants vest after three years of service. The cash balance benefits for salaried employees are determined based primarily on certain percentages of compensation, age, years of service and interest accrued based on the 30-year Treasury bond rate. Participants who were employees of the Operating Partnership on September 1, 2000, earn benefits based on the greater of the cash balance formula or a monthly pension benefit that is principally based on the highest monthly average earnings during any consecutive sixty-month out of 120-month period and the number of years of service credit. The benefits to hourly employees are generally based on a fixed amount per year of service.
	The Operating Partnership maintains a qualified defined benefit pension plan and two non-qualified defined benefit pension plans. Assets related to the non-qualified plans are held in a grantor trust and are subject to the claims of creditors in the event of bankruptcy. As a result, pension assets for the non-qualified plans are not considered plan assets, and therefore, have not been netted against our pension liability. Pension assets for the non-qualified plans are included in “Investment in Grantor Trusts” and the related pension liability is included in “Other Current Liabilities” and “Other Liabilities” in our Consolidated Balance Sheets.
	Funded Status. The following table provides a reconciliation of benefit obligations, plan assets, and funded status of the plans for the years ended December 31 (in millions):
			2014				2013
	Change in Benefit Obligation
	Benefit Obligation at Beginning of Period		$	178			$	181
	Service Cost		7				7
	Interest Cost		8				8
	Actuarial (Gain) Loss		32				(12		)
	Benefits Paid		(7		)		(6		)
	Benefit Obligation at End of Period		$	218			$	178
	Change in Plan Assets
	Fair Value of Plan Assets at Beginning of Period		$	144			$	128
	Actual Return on Plan Assets		7				22
	Employer Contributions		10				—
	Benefits Paid		(7		)		(6		)
	Fair Value of Plan Assets at End of Period		154				144
	Funded Status—December 31		$	(64	)		$	(34	)
	Amounts Recognized in the Consolidated Balance Sheet
	Other Assets		$	—			$	10
	Other Current Liabilities		(5		)		(5		)
	Other Liabilities		(59		)		(39		)
	Total		$	(64	)		$	(34	)
	Note: The Benefit Obligation reflects both the qualified and non-qualified plans while the Plan Assets reflects only the qualified plan. The actuarial loss reflected in the change in benefit obligation for 2014 is due primarily to a change in the interest rate assumptions (decreased discount rates) for measuring our pension liabilities as of December 31, 2014, and to a lesser extent, a change in our mortality assumptions (plan participants are living longer). The actuarial gain reflected in the change in benefit obligation for 2013 is due primarily to a change in the interest rate assumptions (increased discount rates) for measuring our pension liabilities as of December 31, 2013.
	The following table sets forth the benefit obligation, accumulated benefit obligation, plan assets, and assets held in the grantor trust for the qualified and non-qualified pension plans as of December 31 (in millions):
			Qualified Pension Plan								Non-Qualified Pension Plans
			2014				2013				2014			2013
	Projected Benefit Obligation		$	164			$	134			$	54		$	44
	Accumulated Benefit Obligation		154				126				45			36
	Plan Assets		154				144				N/A			N/A
	Assets Held in the Grantor Trust		N/A				N/A				43			40
	Pension contributions are significantly impacted by investment returns and changes in interest rates. It is generally the Operating Partnership’s policy to fund the qualified plan annually such that the fair value of plan assets equals or exceeds the actuarially computed accumulated benefit obligation (the approximate actuarially computed current pension obligation if the plan was discontinued) over a market cycle (generally 3 to 5 years). During 2014, the Operating Partnership contributed $9 million to the qualified pension plan and contributed $1 million to its grantor trust associated with the non-qualified plans. During 2013, the Operating Partnership did not make any contributions to the qualified pension plan or to its grantor trust associated with the non-qualified plans. Based on current interest rates and expected returns, the Operating Partnership expects 2015 contributions to the qualified pension plan to range between $4 million and $8 million. During 2015, the Operating Partnership expects to contribute between $1 million and $4 million to its grantor trust associated with the non-qualified plans.
	Pension Cost and Assumptions. The components of pension cost recognized in net income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Service Cost		$	7			$	7			$	6
	Interest Cost		8				8				8
	Expected Return on Plan Assets		(9		)		(9		)		(7		)
	Recognized Actuarial Loss		2				5				4
	Total Pension Cost		$	8			$	11			$	11
	The components of pension cost recognized in comprehensive income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Net Actuarial Loss (Gain)		$	34			$	(25	)		$	2
	Amortization of Net Actuarial Loss		(2		)		(5		)		(4		)
	Total (Gain) Loss Recognized in Other Comprehensive Income		$	32			$	(30	)		$	(2	)
	Combined Pension Cost Recognized in Comprehensive Income		$	40			$	(19	)		$	9
	Amounts included in accumulated other comprehensive income are as follows as of December 31 (in millions):
			2014				2013
	Net Loss		$	54			$	22
	Deferred Tax Benefit		$	(13	)		$	(6	)
	During 2015, the Operating Partnership expects $4 million of the $54 million net actuarial loss to be included as a component of our total pension cost.
	The qualified pension plan allows terminated employees to elect to receive pension benefits either as a lump-sum distribution or as annuity payments. The non-qualified plans only provide for lump-sum distributions. Management estimates that approximately half of the qualified plan participants will elect a lump-sum payment upon termination. Therefore, approximately 50% of the benefit obligation for the qualified plan is discounted based on high quality corporate bond yields while approximately 50% of the qualified plan and 100% of the non-qualified plans are discounted based on yields on 30-year U.S. Treasury bonds. Weighted-average assumptions used to determine benefit obligation are as follows:
			December 31, 2014			December 31, 2013
	Discount Rates
	Annuity Distributions		4.15	%		5.05	%
	Lump-Sum Distributions		3.04	%		3.8	%
	Rate of Compensation Increase		3.45	%		3.45	%
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
			2014			2013			2012
	Discount Rate		5.05	%		4.35	%		4.95	%
	Expected Long-Term Return on Plan Assets		7.25	%		7.25	%		7.5	%
	Rate of Compensation Increase		3.45	%		3.45	%		3.45	%
	To develop the expected long-term rate of return on plan assets assumption, the Operating Partnership considered the current level of expected returns on risk-free investments (primarily government bonds), the historical level of the risk premium associated with the other asset classes in which the portfolio is invested and the expectations for future returns on each asset class. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected long-term rate of return on plan assets assumption for the portfolio. This resulted in the selection of the 7.25% assumption as of January 1, 2014 and as of January 1, 2013.
	The market related value of plan assets for the qualified plan is a calculated value that spreads unexpected investment returns over three years. The market-related value of assets held in a grantor trust for the non-qualified plans is fair market value. The market-related values are used to determine the amount of net actuarial loss/gain which is recognized as a component of pension cost. There has been no change in the method for determining the market-related value of assets since the prior valuation.
The benefit obligation and net periodic pension cost are impacted by assumptions for plan participants' life expectancies. In determining the benefit obligation at December 31, 2014, the Operating Partnership updated its mortality assumptions to reflect increased life expectancies. The updated mortality assumptions did not impact the 2014 net periodic pension cost and will not significantly impact future net periodic pension costs.
Investment Policies and Strategies. Investment allocation decisions are made to achieve maximum returns at a reasonable risk for the Operating Partnership’s pension assets over a full market cycle and are made without regard to future pension obligations. At December 31, 2014, target allocations for the various asset classes are as follows:
Large Capitalization Domestic Equities	32		%
Small and Mid-Size Capitalization Domestic Equities	7		%
International Equities	26		%
Fixed Income	35		%
The Operating Partnership currently uses actively managed funds and index funds, utilizing seven fund managers, to capture favorable returns in various asset classes and to diversify risk. All asset classes are invested in a diversified portfolio and fund managers are expected to be well diversified with respect to company, industry and economic sectors. Equity investments consist primarily of common stocks, common stock equivalents and preferred stock. Fixed income investments consist primarily of investments in U.S. treasuries, agencies of the U.S. Government, corporations, municipalities, banks, foreign bonds and other financial institutions. Pension assets are analyzed at least quarterly and rebalanced as needed to maintain the target allocations.
Over a full market cycle, the investment goals (net of related fees) for the Operating Partnership’s various asset classes are as follows:
•	Large Cap. Domestic Equities—For actively managed funds performance should exceed the applicable benchmark (e.g., Russell 1000 Growth or Russell 1000 Value Indexes) by 0.50% per annum, while index funds should match the performance of the applicable benchmark (e.g. S&P 500 Index).
•	Small and Mid. Cap. Domestic Equities—For index funds performance should match the applicable benchmark (e.g. Russell 2000 Index).
•	International Equities—For actively managed funds performance should exceed the applicable benchmark (e.g. MSCI EAFE Index) by 1.00% per annum, while index funds should match the performance of the applicable benchmark (e.g. MSCI Emerging Markets Index).
•	Fixed Income Securities—Fund performance should exceed the applicable benchmark (e.g., Barclays Capital Aggregate Bond, Barclays Capital High Yield, or Barclays Capital U.S. Credit Indexes) by 0.25% per annum.
Fair Value of Pension Plan Assets. The fair values of each major class of plan assets were as follows as of December 31, 2014 (in millions):
		Quoted Prices				Significant				Total
		In Active				Observable
		Markets for				Inputs
		Identical Assets				(Level 2)
		(Level 1)
Money Market Funds		$	1			$	—			$	1
Mutual Funds invested in:
Large Cap. Domestic Equity Securities		16				—				16
Small and Mid. Cap. Domestic Equity Securities		11				—				11
International Equity Securities		40				—				40
Fixed Income Securities		8				—				8
Collective Trust Funds invested in:
Large Cap. Domestic Equity Securities		—				34				34
Fixed Income Securities		—				8				8
Limited Partnership Interest invested in:
Fixed Income Securities		—				36				36
Total Investments Measured at Fair Value		$	76			$	78			$	154
The fair values of each major class of plan assets were as follows as of December 31, 2013 (in millions):
		Quoted Prices				Significant				Total
		In Active				Observable
		Markets for				Inputs
		Identical Assets				(Level 2)
		(Level 1)
Money Market Funds		$	—			$	—			$	—
Mutual Funds invested in:
Large Cap. Domestic Equity Securities		16				—				16
Small and Mid. Cap. Domestic Equity Securities		11				—				11
International Equity Securities		38				—				38
Fixed Income Securities		40				—				40
Collective Trust Funds invested in:
Large Cap. Domestic Equity Securities		—				32				32
Fixed Income Securities		—				7				7
Total Investments Measured at Fair Value		$	105			$	39			$	144
The valuation techniques and inputs used to measure fair value for each major class of plan assets were as follows (there have been no changes in these techniques and inputs during the year ended December 31, 2014):
•	The fair value of mutual funds is derived from quoted market prices in active markets at the measurement date.
•	The fair value of the underlying assets of the collective trust funds and limited partnership interest is determined using the net asset values. The net asset values are based on the fair value of the underlying assets, minus their liabilities, and then divided by the number of units outstanding at the valuation date. The unit price is based primarily on observable market data of the fund’s underlying assets.
Projected Benefit Payments. The following table presents expected future benefit payments projected based on the same assumptions used by the Operating Partnership to measure the benefit obligation and estimate future employee service (in millions):
Year	Projected Benefit
	Payments
2015	$	17
2016	18
2017	27
2018	15
2019	16
2020 through 2024	78
Thrift and Profit Sharing Plan. The Operating Partnership sponsors an employee thrift and profit sharing plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all full-time employees. The Operating Partnership matches employee contributions of up to six percent of compensation at rates ranging from 35% to 100%, depending upon financial performance.
The employer match was 100% for 2014, 2013 and 2012. Amounts charged to expense relating to the Operating Partnership’s thrift and profit sharing plan were $5 million in 2014 and $4 million in 2013 and 2012.

ShareBased_Compensation_Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Share-Based Compensation Plans	SHARE-BASED COMPENSATION PLANS
	Plum Creek has a stockholder approved Stock Incentive Plan (“the Plan”) that provides for the award of shares of the company’s stock including, but not limited to, common stock awards, restricted stock units and value management awards. Under the Plan, there are 6.1 million shares of common stock reserved and eligible for issuance. At December 31, 2014, 0.6 million shares of the 6.1 million reserved shares have been used and, therefore, 5.5 million shares remain available for future grants of common stock awards and restricted stock units or payments of vested value management awards. The number of shares to be issued in connection with value management awards is not determined until the end of their respective performance periods. New shares are issued for payment under the Plan for awards that pay out in shares or where the participant can elect payment in shares.
	Value Management Awards. Value management awards provide incentive compensation to participants that is contingent upon the company’s performance over a three-year period measured separately against the performance of peer groups consisting of forest products companies, the S&P 500 Index and the MSCI U.S. REIT Index over the same period.
	Value management awards are earned in whole or in part based on a sliding scale. No award is earned if the company's total shareholder return is below the 25th percentile of the peer group. The full value management award is earned if the company’s total shareholder return is above the 85th percentile. The value of an award between the 25th percentile and the 85th percentile is based on a sliding scale between 0% and 200% of the face value. A unit has a face value of $100, which equates performance to the 55th percentile.
	Amounts earned, if any, are paid in the quarter immediately following the end of the three-year performance period. Unless otherwise specified by the participant, each payment will be paid in cash, except that any officer not in compliance with the company’s stock ownership guidelines is required to receive up to half of the payment value in the company’s common stock. To be entitled to the payment, a participant must be employed by the company on the last day of the performance period.
	Value management awards activity was as follows for the year ended December 31, 2014:
		Units
	Nonvested, January 1, 2014	256,133
	Granted	145,080
	Vested	(123,080	)
	Forfeited	(6,975	)
	Nonvested, December 31, 2014	271,158
	Presented below is a summary of outstanding value management awards and related fair values, unrecognized compensation expense and maximum value as of December 31, 2014 (dollars in millions):
	Performance Period		Outstanding		Fair Value (A)			Unrecognized				Maximum Award
			Units					Compensation				Value (B)
								Expense
	2012 to 2014		120,280		$	0.3		$	—			$	24.1
	2013 to 2015		129,203		$	2.5		$	0.8			$	25.8
	2014 to 2016		141,955		$	6.3		$	4			$	28.4
	(A)	The estimated fair value includes unrecognized compensation expense.
	(B)	Maximum award value is based on a unit value of $200.
	Presented below is a summary of earned and paid (primarily in cash) value management awards for the following three-year performance periods:
	Performance Period		Payout Value			Total Payout			Payment Date
			per Unit			(millions)
	2012 to 2014		$	3		$	0.3		1st Quarter 2015
	2011 to 2013		$	35		$	2.7		1st Quarter 2014
	2010 to 2012		$	0		$	0		Not Earned
	2009 to 2011		$	0		$	0		Not Earned
	Grants of value management awards are classified and accounted for as liabilities. As a result, the expense recognized over the performance period for value management awards will equal the fair value (i.e., cash value) of an award as of the last day of the performance period multiplied by the number of awards that are earned. The quarterly expense is recognized during the performance period based on the fair value of value management awards as of the end of the most recent quarter. Prior to the end of the performance period, compensation costs for value management awards are based on the awards’ most recent quarterly fair values and the number of months of service rendered during the performance period.
	Fair values for value management awards are computed based on our historical relative total shareholder return compared to the peer group from the beginning of the performance period to the end of the most recent quarter, and our simulated relative total shareholder return through the end of the performance period. The simulated total shareholder return of the company and the peer group is computed using a Monte Carlo simulation. The key assumptions used in the simulation of the company’s and the peer group’s total shareholder return are volatility, beta (the measure of how Plum Creek’s stock moves relative to the market as a whole) and risk-free interest rate.
	Restricted Stock Units. Under the Plan, restricted stock units may be awarded to certain directors, officers and employees of the company. The recipients of restricted stock units generally have the right to receive a cash amount equal to any dividends paid on the company’s common stock during the restriction period and upon vesting, the right to receive an equal number of shares of the company’s common stock. Restricted stock units generally vest over a four-year period at a rate of 25% per year. If employment is terminated prior to vesting, all unvested restricted stock units are forfeited. The weighted-average grant date fair value of restricted stock units granted for the years ended December 31, 2014, 2013 and 2012 was $42.04, $47.93 and $39.00, respectively. The fair value of restricted stock units is based on the closing price of the company’s common stock on the date of grant.
	Restricted stock unit activity was as follows for the year ended December 31, 2014:
			Units		Weighted-
					Average
					Grant Date
					Fair Value
	Nonvested, January 1, 2014		366,133		$	43.35
	Granted		228,765		$	42.04
	Vested		(133,236	)	$	41.71
	Forfeited		(48,090	)	$	42.12
	Nonvested, December 31, 2014		413,572		$	43.3
	The total fair value of restricted stock units that vested during the years ended December 31, 2014, 2013 and 2012 was approximately $6 million, $5 million and $4 million, respectively.
	Awards of Common Stock. Under the Plan, common stock of the company may be awarded to directors, officers and employees of the company. The common stock is granted without restriction or vesting provisions. During 2014, 24,053 shares of common stock were granted/issued. The weighted-average grant date fair value of common stock awards granted for the years ended December 31, 2014, 2013 and 2012 was $42.14, $48.47 and $38.93, respectively. The fair value of common stock awards is based on the closing price of Plum Creek's common stock on the date of grant. The total fair value of common stock awards that were issued during 2014, 2013 and 2012 was $1 million, $1 million and $0.7 million, respectively.
	Stock Options. Under the Plan, non-qualified stock options may be granted to directors, officers and employees of the company. Each stock option granted allows the recipient the right to purchase the company’s common stock at the fair market value of the company’s common stock on the date of grant. Generally, the stock options have a ten-year term and vest over a four-year period at a rate of 25% per year. Under the Plan, the exercise price of an option may not be reduced. No stock options have been awarded since 2011.
	Presented below is a summary of Plum Creek’s stock option Plan activity for the year ended December 31, 2014:
			Shares		Weighted-			Weighted-			Aggregate
			Subject to		Average			Average			Intrinsic Value
			Options		Exercise			Remaining			(Millions)
					Price			Contractual
								Life (Years)
	Outstanding, January 1, 2014		1,928,961		$	38.47
	Granted		—		—
	Exercised/Surrendered		(70,425	)	35.54
	Cancelled/Forfeited		(12,238	)	36.36
	Outstanding, December 31, 2014		1,846,298		$	38.59		4			$	8
	Vested or Expected to Vest, December 31, 2014		1,846,298		$	38.59		4			$	8
	Exercisable, December 31, 2014		1,713,696		$	38.37		4			$	8
	The table below presents stock activity related to stock options exercised during the years ended December 31 (in millions):
			2014			2013			2012
	Proceeds from Stock Options Exercised		$	3		$	37		$	18
	Intrinsic Value of Stock Options Exercised		$	1		$	12		$	6
	Tax Benefit Related to Stock Options Exercised		$	—		$	2		$	1
	Accounting for Share-Based Compensation. Share-based employee compensation cost is recognized based on fair value (see “Accounting for Share-Based Compensation” in Note 1 of the Notes to Consolidated Financial Statements). Stock options and most restricted stock units vest 25% per year over a four-year vesting period. Compensation cost related to these awards is recognized using the straight-line method over the four-year vesting period. The table below presents total compensation expense and recognized tax benefits for all share-based compensation plans (including both awards paid in stock and cash) for the years ended December 31 (in millions):
			2014			2013			2012
Share-based Compensation Expense		$	6		$	13		$	13
Recognized Tax Benefits		$	1		$	2		$	2
At December 31, 2014, there was $16 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan. That cost is expected to be recognized over a weighted-average period of approximately two years.
PLUM CREEK TIMBERLANDS L P [Member]
Share-Based Compensation Plans	SHARE-BASED COMPENSATION PLANS
	All of Plum Creek’s activities are conducted through the Operating Partnership, therefore all share-based compensation expense is allocated to the Operating Partnership. Proceeds from the exercise of Plum Creek stock options are retained by Plum Creek Timber Company, Inc.
	Plum Creek Timber Company, Inc. has a stockholder approved Stock Incentive Plan ("the Plan") that provides for the award of shares of Plum Creek stock including, but not limited to, common stock awards, restricted stock units and value management awards. Under the Plan, there are 6.1 million shares of Plum Creek Timber Company, Inc. common stock reserved and eligible for issuance. At December 31, 2014, 0.6 million shares of the 6.1 million reserved shares have been used and, therefore, 5.5 million shares remain available for future grants of common stock awards and restricted stock units or payments of vested value management awards. The number of shares to be issued in connection with value management awards is not determined until the end of their respective performance periods. New shares are issued for payment under the Plan for awards that pay out in shares or where the participant can elect payment in shares.
	Value Management Awards. Value management awards provide incentive compensation to participants that is contingent upon Plum Creek’s performance over a three-year period measured separately against the performance of peer groups consisting of forest products companies, the S&P 500 Index and the MSCI U.S. REIT Index over the same period.
	Value management awards are earned in whole or in part based on a sliding scale. No award is earned if Plum Creek’s total shareholder return is below the 25th percentile of the peer group. The full value management award is earned if Plum Creek’s total shareholder return is above the 85th percentile. The value of an award between the 25th percentile and the 85th percentile is based on a sliding scale between 0% and 200% of the face value. A unit has a face value of $100, which equates performance to the 55th percentile.
	Amounts earned, if any, are paid in the quarter immediately following the end of the three-year performance period. Unless otherwise specified by the participant, each payment will be paid in cash, except that any officer not in compliance with Plum Creek’s stock ownership guidelines is required to receive up to half of the payment value in Plum Creek’s common stock. To be entitled to the payment, a participant must be employed by the Operating Partnership on the last day of the performance period.
	Value management awards activity was as follows for the year ended December 31, 2014:
		Units
	Nonvested, January 1, 2014	256,133
	Granted	145,080
	Vested	(123,080	)
	Forfeited	(6,975	)
	Nonvested, December 31, 2014	271,158
	Presented below is a summary of outstanding value management awards and related fair values, unrecognized compensation expense and maximum value as of December 31, 2014 (dollars in millions):
	Performance Period		Outstanding		Fair Value (A)			Unrecognized				Maximum Award
			Units					Compensation				Value (B)
								Expense
	2012 to 2014		120,280		$	0.3		$	—			$	24.1
	2013 to 2015		129,203		$	2.5		$	0.8			$	25.8
	2014 to 2016		141,955		$	6.3		$	4			$	28.4
	(A)	The estimated fair value includes unrecognized compensation expense.
	(B)	Maximum award value is based on a unit value of $200.
	Presented below is a summary of earned and paid (primarily in cash) value management awards for the following three-year performance periods:
	Performance Period		Payout Value			Total Payout			Payment Date
			per Unit			(millions)
	2012 to 2014		$	3		$	0.3		1st Quarter 2015
	2011 to 2013		$	35		$	2.7		1st Quarter 2014
	2010 to 2012		$	0		$	0		Not Earned
	2009 to 2011		$	0		$	0		Not Earned
	Grants of value management awards are classified and accounted for as liabilities. As a result, the expense recognized over the performance period for value management awards will equal the fair value (i.e., cash value) of an award as of the last day of the performance period multiplied by the number of awards that are earned. The quarterly expense is recognized during the performance period based on the fair value of value management awards as of the end of the most recent quarter. Prior to the end of the performance period, compensation costs for value management awards are based on the awards’ most recent quarterly fair values and the number of months of service rendered during the performance period.
	Fair values for value management awards are computed based on Plum Creek’s historical relative total shareholder return compared to the peer group from the beginning of the performance period to the end of the most recent quarter, and its simulated relative total shareholder return through the end of the performance period. The simulated total shareholder return of Plum Creek and the peer group is computed using a Monte Carlo simulation. The key assumptions used in the simulation of Plum Creek’s and the peer group’s total shareholder return are volatility, beta (the measure of how Plum Creek’s stock moves relative to the market as a whole) and risk-free interest rate.
	Restricted Stock Units. Under the Plan, restricted stock units of Plum Creek Timber Company, Inc. may be awarded to certain directors, officers and employees of the Operating Partnership. The recipients of restricted stock units generally have the right to receive a cash amount equal to any dividends paid on Plum Creek’s common stock during the restriction period and upon vesting, the right to receive an equal number of shares of Plum Creek’s common stock. Restricted stock units generally vest over a four-year period at a rate of 25% per year. If employment is terminated prior to vesting, all unvested restricted stock units are forfeited. The weighted-average grant date fair value of restricted stock units granted for the years ended December 31, 2014, 2013 and 2012 was $42.04, $47.93 and $39.00, respectively. The fair value of restricted stock units is based on the closing price of Plum Creek’s common stock on the date of grant.
	Restricted stock unit activity was as follows for the year ended December 31, 2014:
			Units		Weighted-
					Average
					Grant Date
					Fair Value
	Nonvested, January 1, 2014		366,133		$	43.35
	Granted		228,765		$	42.04
	Vested		(133,236	)	$	41.71
	Forfeited		(48,090	)	$	42.12
	Nonvested, December 31, 2014		413,572		$	43.3
	The total fair value of restricted stock units that vested during the years ended December 31, 2014, 2013 and 2012 was approximately $6 million, $5 million and $4 million, respectively.
	Awards of Common Stock. Under the Plan, common stock of Plum Creek Timber Company, Inc. may be awarded to directors, officers and employees of the Operating Partnership. The common stock is granted without restriction or vesting provisions. During 2014, 24,053 shares of Plum Creek common stock were granted/issued. The weighted-average grant date fair value of common stock awards granted for the years ended December 31, 2014, 2013, and 2012 was $42.14, $48.47 and $38.93, respectively. The fair value of common stock awards is based on the closing price of Plum Creek’s common stock on the date of grant. The total fair value of common stock awards that were issued during 2014, 2013 and 2012 was $1 million, $1 million and $0.7 million, respectively.
	Stock Options. Under the Plan, non-qualified stock options may be granted to directors, officers and employees of the Operating Partnership. Each stock option granted allows the recipient the right to purchase Plum Creek’s common stock at the fair market value of Plum Creek’s common stock on the date of grant. Generally, the stock options have a ten-year term and vest over a four-year period at a rate of 25% per year. Under the Plan, the exercise price of an option may not be reduced. No stock options have been awarded since 2011.
	Presented below is a summary of Plum Creek’s stock option Plan activity for the year ended December 31, 2014:
			Shares		Weighted-			Weighted-			Aggregate
			Subject to		Average			Average			Intrinsic Value
			Options		Exercise			Remaining			(Millions)
					Price			Contractual
								Life (Years)
	Outstanding, January 1, 2014		1,928,961		$	38.47
	Granted		—		—
	Exercised/Surrendered		(70,425	)	35.54
	Cancelled/Forfeited		(12,238	)	36.36
	Outstanding, December 31, 2014		1,846,298		$	38.59		4			$	8
	Vested or Expected to Vest, December 31, 2014		1,846,298		$	38.59		4			$	8
	Exercisable, December 31, 2014		1,713,696		$	38.37		4			$	8
	The table below presents stock activity related to stock options exercised during the years ended December 31 (in millions):
			2014			2013			2012
	Proceeds from Stock Options Exercised		$	3		$	37		$	18
	Intrinsic Value of Stock Options Exercised		$	1		$	12		$	6
	Tax Benefit Related to Stock Options Exercised		$	—		$	2		$	1
	Accounting for Share-Based Compensation. Share-based employee compensation cost is recognized based on fair value (see “Accounting for Share-Based Compensation” in Note 1 of the Notes to Consolidated Financial Statements). Stock options and most restricted stock units vest 25% per year over a four-year vesting period. Compensation cost related to these awards is recognized using the straight-line method over the four-year vesting period. The table below presents total compensation expense and recognized tax benefits for all share-based compensation plans (including both awards paid in stock and cash) for the years ended December 31 (in millions):
		2014			2013			2012
Share-based Compensation Expense		$	6		$	13		$	13
Recognized Tax Benefits		$	1		$	2		$	2
At December 31, 2014, there was $16 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the Plan. That cost is expected to be recognized over a weighted-average period of approximately two years.

Detail_of_Certain_Balance_Shee

Detail of Certain Balance Sheet Accounts	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Details of Certain Balance Sheet Accounts Disclosure [Text Block]	DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS
	Certain balance sheet accounts consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Other Current Assets
	Prepaid Expenses	$	8	$	7
	Taxes Receivable	4		3
	Notes Receivable	—		3
	Deposits	2		2
	Real Estate Development Properties	1		—
		$	15	$	15
	Other Non-Current Assets
	Real Estate Development Properties	$	12	$	13
	Unamortized Debt Issue Costs	7		8
	Deposits	8		8
	Qualified Pension Asset	—		10
	Intangible Assets	14		15
	Other	4		—
		$	45	$	54
	Other Current Liabilities
	Long-Term Incentive Compensation	$	—	$	3
	Accrued Pension Liability	5		5
	Workers’ Compensation	1		1
	Other	4		1
		$	10	$	10
	Other Non-Current Liabilities
	Timber Obligations	$	5	$	5
	Deferred Compensation	5		5
	Long-Term Incentive Compensation	4		8
	Accrued Pension Liability	59		39
	Deferred Revenue	12		7
	Workers’ Compensation	7		9
	Other	8		5
		$	100	$	78
PLUM CREEK TIMBERLANDS L P [Member]
Details of Certain Balance Sheet Accounts Disclosure [Text Block]	DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS
	Certain balance sheet accounts consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Other Current Assets
	Prepaid Expenses	$	8	$	7
	Taxes Receivable	4		3
	Notes Receivable	—		3
	Deposits	2		2
	Real Estate Development Properties	1		—
		$	15	$	15
	Other Non-Current Assets
	Real Estate Development Properties	$	12	$	13
	Unamortized Debt Issue Costs	7		8
	Deposits	8		8
	Qualified Pension Asset	—		10
	Intangible Assets	14		15
	Other	4		—
		$	45	$	54
	Other Current Liabilities
	Long-Term Incentive Compensation	$	—	$	3
	Accrued Pension Liability	5		5
	Workers’ Compensation	1		1
	Other	4		1
		$	10	$	10
	Other Non-Current Liabilities
	Timber Obligations	$	5	$	5
	Deferred Compensation	6		6
	Long-Term Incentive Compensation	4		8
	Accrued Pension Liability	59		39
	Deferred Revenue	12		7
	Workers’ Compensation	7		9
	Other	8		5
		$	101	$	79

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Contingencies. The company is subject to regulations regarding forest, harvest and manufacturing practices and is, from time to time, involved in various legal proceedings, including, but not limited to, environmental and regulatory matters, incidental to its business. Reserves have been established for any probable losses. Except as discussed elsewhere, management does not believe that these matters, individually or in the aggregate, are material. However, it is possible that one or more of these matters could become material in the future, and an unfavorable outcome in one or more of these matters could have a material negative financial impact on the company. See also Note 9 of the Notes to Consolidated Financial Statements for a discussion of a tax proceeding involving the company and its consolidated subsidiaries.
	MDF Fire Loss and Related Insurance Recoveries. During 2014, the company incurred a fire loss at its Medium Density Fiberboard (“MDF”) facility. The estimated net book value of the MDF building and equipment damaged by the fire was $2 million.
	The company carries property insurance which is expected to reimburse the company for costs incurred to rebuild the damaged building and equipment along with any related lost earnings (i.e. business interruption insurance). During 2014, the company recorded a gain related to insurance recoveries of $13 million. Insurance recoveries received were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. The $2 million fire loss and related $13 million insurance recoveries resulted in a net $11 million gain and is included in operating income for the Manufacturing Segment and in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	During 2015, the company expects to recognize additional insurance recoveries of approximately $2 million related primarily to additional costs to restore the damaged building and equipment. Insurance proceeds related to reimbursed costs to restore the damaged property are reported when received under investing activities and insurance proceeds associated with lost earnings are reported under operating activities in the Consolidated Statements of Cash Flows.
	Contractual Obligations. The company has contracted to source logs and supply fiber with customers under long-term agreements at prevailing market rates. The agreements expire beginning in 2015 through 2038, with the majority having various renewal options by either party. These renewal options are for periods ranging from two years to fifteen additional years.
	Lease Commitments. The company leases buildings and equipment under non–cancelable operating lease agreements. Operating lease expense was $4 million in both 2014 and 2013 and $3 million in 2012. Additionally, the company has timber obligations related to certain timberlands where the company acquired title to standing timber at the inception of the leases. The following summarizes the future minimum operating lease payments and obligations in connection with leasing timberlands at December 31, 2014 (in millions):
		Operating		Timber
		Leases		Obligations
	2015	$	4	$	1
	2016	4		—
	2017	4		—
	2018	4		—
	2019	3		—
	Thereafter	12		4
	Total	$	31	$	5
PLUM CREEK TIMBERLANDS L P [Member]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Contingencies. The Operating Partnership is subject to regulations regarding forest, harvest and manufacturing practices and is, from time to time, involved in various legal proceedings, including, but not limited to, environmental and regulatory matters, incidental to its business. Reserves have been established for any probable losses. Except as discussed elsewhere, management does not believe that these matters, individually or in the aggregate, are material. However, it is possible that one or more of these matters could become material in the future, and an unfavorable outcome in one or more of these matters could have a material negative financial impact on the Operating Partnership. See also Note 8 of the Notes to Consolidated Financial Statements for a discussion of a tax proceeding involving Plum Creek.
	MDF Fire Loss and Related Insurance Recoveries. During 2014, the Operating Partnership incurred a fire loss at its Medium Density Fiberboard (“MDF”) facility. The estimated net book value of the MDF building and equipment damaged by the fire was $2 million.
	The Operating Partnership carries property insurance which is expected to reimburse the Operating Partnership for costs incurred to rebuild the damaged building and equipment along with any related lost earnings (i.e. business interruption insurance). During 2014, the Operating Partnership recorded a gain related to insurance recoveries of $13 million. Insurance recoveries received were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. The $2 million fire loss and related $13 million insurance recoveries resulted in a net $11 million gain and is included in operating income for the Manufacturing Segment and in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	During 2015, the Operating Partnership expects to recognize additional insurance recoveries of approximately $2 million related primarily to additional costs to restore the damaged building and equipment. Insurance proceeds related to reimbursed costs to restore the damaged property are reported when received under investing activities and insurance proceeds associated with lost earnings are reported under operating activities in the Consolidated Statements of Cash Flows.
	Contractual Obligations. The Operating Partnership has contracted to source logs and supply fiber with customers under long-term agreements at prevailing market rates. The agreements expire beginning in 2015 through 2038, with the majority having various renewal options by either party. These renewal options are for periods ranging from two years to fifteen additional years.
	Lease Commitments. The Operating Partnership leases buildings and equipment under non–cancelable operating lease agreements. Operating lease expense was $4 million in both 2014 and 2013 and $3 million in 2012. Additionally, the Operating Partnership has timber obligations related to certain timberlands where the Operating Partnership acquired title to standing timber at the inception of the leases. The following summarizes the future minimum operating lease payments and obligations in connection with leasing timberlands at December 31, 2014 (in millions):
		Operating		Timber
		Leases		Obligations
	2015	$	4	$	1
	2016	4		—
	2017	4		—
	2018	4		—
	2019	3		—
	Thereafter	12		4
	Total	$	31	$	5

Equity_Method_Investments

Equity Method Investments	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Equity Method Investments	EQUITY METHOD INVESTMENTS
	Real Estate Development Ventures. On December 6, 2013, in connection with the MeadWestvaco timberland acquisition (see Note 2 of the Notes to Consolidated Financial Statements) the company and MeadWestvaco Corporation (“MWV”) formed a limited liability company (MWV-Charleston Land Partners, LLC or “MWV-CLP”). Plum Creek contributed cash to MWV-CLP and MWV contributed real estate development properties, which consisted of both residential and commercial properties currently under development (“Class A Properties”) and high-value development lands (“Class B Properties”). Plum Creek contributed $12 million in exchange for a 5% interest in Class A Properties and $140 million in exchange for a 50% interest in Class B Properties. MWV contributed 22,000 acres of Class A Properties with an agreed upon value of $252 million in exchange for a 95% interest in Class A Properties and 87,000 acres of Class B Properties with an agreed upon value of $279 million in exchange for a 50% interest in Class B Properties. During 2014, the company’s ownership interest in the Class A Properties decreased from 5% to 4% due to capital calls by MWV-CLP for which the company declined to participate.
	An affiliate of MWV has been hired to manage the day-to-day operations of MWV-CLP. Oversight of the Class A Properties is governed by a board of directors consisting of four members of which Plum Creek has one board member. Oversight of the Class B Properties is governed by a board of directors consisting of six members of which Plum Creek has three board members. The company uses the equity method of accounting for both its Class A and Class B interests.
	The total purchase price for the MeadWestvaco timberlands and related assets was $1.1 billion of which $139 million was allocated to our equity method investments in MWV-CLP. Our share of the book value of MWV-CLP’s net assets as of the acquisition date was approximately $52 million. This basis difference of $87 million will be amortized (i.e., additional expense) into equity earnings (loss) in future periods as the real estate properties are sold and/or as the timber on these properties is harvested.
	Timberland Venture. In 2008, the company contributed 454,000 acres of timberlands located in its Southern Resources Segment to Southern Diversified Timber, LLC (“the Timberland Venture”) in exchange for a $705 million preferred interest and a 9% common interest valued at $78 million. The Timberland Venture’s other member, an affiliate of The Campbell Group LLC, contributed $783 million of cash in exchange for 91% of the Timberland Venture’s common interest. Following the contribution, the company borrowed $783 million from the Timberland Venture (“Note Payable to Timberland Venture”).
	The preferred interest is entitled to a cumulative preferred return equal to 7.875% per annum (approximately $56 million). No distributions can be made on the common interests until all current period and prior period preferred returns have been paid. Preferred return distributions are payable on March 15th and September 15th each year.
	The annual interest rate on the Note Payable to Timberland Venture is fixed at 7.375%, resulting in annual interest expense of approximately $58 million. During the 10-year term of the note, interest is paid quarterly with the principal due upon maturity.
	The activities of the Timberland Venture consist primarily of the ownership of timberlands and entering into cutting contracts with an affiliate of The Campbell Group for the sale and harvesting of timber. An affiliate of The Campbell Group is the manager of the Timberland Venture. The manager and the other member control the day-to-day operating decisions of the Timberland Venture. Plum Creek retains certain protective rights that require its consent before the Timberland Venture can take certain actions. For example, without Plum Creek’s consent and subject to certain exceptions, the Timberland Venture generally cannot sell properties, incur indebtedness, file for bankruptcy or enter into contracts with affiliates which are not arm’s length.
	No gain was recognized in connection with the contribution of the timberlands to the venture in 2008. The book basis in the contributed timberlands was $174 million, and the company capitalized costs of $9 million in connection with the transfer. The Timberland Venture recorded the contributed timberlands at fair value, or $783 million. The difference between the beginning book basis in the venture ($174 million) and the company’s share of the equity in the net assets of the venture ($783 million) was allocated between standing timber ($289 million) and land ($320 million). In addition to the allocation of earnings to our common and preferred interests, the basis difference associated with standing timber is amortized into equity earnings based on the timber harvested during the period compared to the timber expected to be harvested over one timber rotation (approximately 27 years). The basis difference associated with land is recognized in equity earnings in the period in which timberlands are sold by the venture based on a per acre rate. Since the inception of the Timberland Venture through December 31, 2014, the company has recognized $49 million in equity earnings related to the amortization of the basis difference.
	Both our preferred and common interests are accounted for based on the equity method of accounting. Equity earnings of the Timberland Venture are first allocated to our preferred interest to the extent of our preferred return with any excess earnings allocated among the common interests based on ownership percentage (i.e., 9% to our common interest). All of the equity earnings will be allocated to our preferred interest in years in which our preferred return equals or exceeds the earnings of the Timberland Venture. To the extent of any shortfall in equity earnings (cumulative preferred return in excess of allocated equity earnings), future years’ earnings will be allocated to our preferred interest when the earnings of the Timberland Venture exceed our preferred return. At December 31, 2014, the cumulative shortfall in allocated equity earnings is $28 million. In addition to equity earnings associated with our common and preferred interests, equity earnings include the amortization of the difference between the book basis of our investment in the Timberland Venture and our share of the Timberland Venture’s net assets. Equity earnings for the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	54	$	53	$	51
	Common Interest	—		—		—
	Amortization of Basis Difference	9		10		8
	Total Equity Earnings from Timberland Venture	$	63	$	63	$	59
	Distributions from the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	56	$	55	$	56
	Common Interest	1		1		—
	Total Distributions from Timberland Venture	$	57	$	56	$	56
	As of December 31, 2014 and December 31, 2013, the undistributed earnings from the Timberland Venture were $33 million and $27 million, respectively.
	The Timberland Venture can only be liquidated with the consent of both members. However, upon the nine year anniversary of the Timberland Venture, Plum Creek has the right for a six-month period to cause the Timberland Venture to redeem the other member’s interest. The other Timberland Venture member has a similar redemption right after the seven year anniversary (October 1, 2015 to March 31, 2016). Upon liquidation or redemption, the members’ interests (i.e. capital accounts) will be adjusted to reflect the fair value of the Timberland Venture’s net assets. The adjustment would first be allocated to our preferred interest if there exists an accumulated shortfall in net income attributable to our preferred interest but only to the extent that the fair value of the net assets of the Timberland Venture exceed book basis.
	For the years ended December 31, 2014, 2013 and 2012, the Timberland Venture was considered a Significant Subsidiary in accordance with the financial reporting requirements of the Securities and Exchange Commission. Accordingly, the audited financial statements of the Timberland Venture are attached as an exhibit to the company’s 2014 Form 10-K filing.
PLUM CREEK TIMBERLANDS L P [Member]
Equity Method Investments	EQUITY METHOD INVESTMENTS
	Real Estate Development Ventures. On December 6, 2013, in connection with the MeadWestvaco timberland acquisition (see Note 2 of the Notes to Consolidated Financial Statements) the Operating Partnership and MeadWestvaco Corporation (“MWV”) formed a limited liability company (MWV-Charleston Land Partners, LLC or “MWV-CLP”). The Operating Partnership contributed cash to MWV-CLP and MWV contributed real estate development properties, which consisted of both residential and commercial properties currently under development (“Class A Properties”) and high-value development lands (“Class B Properties”). The Operating Partnership contributed $12 million in exchange for a 5% interest in Class A Properties and $140 million in exchange for a 50% interest in Class B Properties. MWV contributed 22,000 acres of Class A Properties with an agreed upon value of $252 million in exchange for a 95% interest in Class A Properties and 87,000 acres of Class B Properties with an agreed upon value of $279 million in exchange for a 50% interest in Class B Properties. During 2014, the company’s ownership interest in the Class A Properties decreased from 5% to 4% due to capital calls by MWV-CLP for which the company declined to participate.
	An affiliate of MWV has been hired to manage the day-to-day operations of MWV-CLP. Oversight of the Class A Properties is governed by a board of directors consisting of four members of which the Operating Partnership has one board member. Oversight of the Class B Properties is governed by a board of directors consisting of six members of which the Operating Partnership has three board members. The Operating Partnership uses the equity method of accounting for both its Class A and Class B interests.
	The total purchase price for the MeadWestvaco timberlands and related assets was $1.1 billion of which $139 million was allocated to our equity method investments in MWV-CLP. Our share of the book value of MWV-CLP’s net assets as of the acquisition date was approximately $52 million. This basis difference of $87 million will be amortized (i.e., additional expense) into equity earnings (loss) in future periods as the real estate properties are sold and/or as the timber on these properties is harvested.
	Timberland Venture. In 2008, a subsidiary of the Operating Partnership, Plum Creek Timber Operations I, LLC (“PC Member”), contributed 454,000 acres of timberlands located in its Southern Resources Segment to Southern Diversified Timber, LLC (“the Timberland Venture”) in exchange for a $705 million preferred interest and a 9% common interest valued at $78 million. The Timberland Venture’s other member, an affiliate of The Campbell Group LLC, contributed $783 million of cash in exchange for 91% of the Timberland Venture’s common interest. Following the formation of the Timberland Venture, PC Ventures borrowed $783 million from the Timberland Venture. PC Ventures used the proceeds from the borrowing to make a $783 million capital contribution to the Operating Partnership. See Note 11 of the Notes to Consolidated Financial Statements.
	PC Member’s preferred interest in the Timberland Venture is entitled to a cumulative preferred return equal to 7.875% per annum (approximately $56 million). The Timberland Venture cannot make distributions on the common interests until all current period and prior period preferred returns have been paid. Preferred return distributions are payable on March 15th and September 15th each year.
	The activities of the Timberland Venture consist primarily of the ownership of timberlands and entering into cutting contracts with an affiliate of The Campbell Group for the sale and harvesting of timber. An affiliate of The Campbell Group is the manager of the Timberland Venture. The manager and the other member control the day-to-day operating decisions of the Timberland Venture. PC Member retains certain protective rights that require its consent before the Timberland Venture can take certain actions. For example, without PC Member’s consent and subject to certain exceptions, the Timberland Venture generally cannot sell properties, incur indebtedness, file for bankruptcy or enter into contracts with affiliates which are not arm’s length.
	No gain was recognized in connection with the contribution of the timberlands to the venture in 2008. The book basis in the contributed timberlands was $174 million, and PC Member capitalized costs of $9 million in connection with the transfer. The Timberland Venture recorded the contributed timberlands at fair value, or $783 million. The difference between the beginning book basis in the venture ($174 million) and PC Member’s share of the equity in the net assets of the venture ($783 million) was allocated between standing timber ($289 million) and land ($320 million). In addition to the allocation of earnings to our common and preferred interests, the basis difference associated with standing timber is amortized into equity earnings based on the timber harvested during the period compared to the timber expected to be harvested over one timber rotation (approximately 27 years). The basis difference associated with land is recognized in equity earnings in the period in which timberlands are sold by the venture based on a per acre rate. Since the inception of the Timberland Venture through December 31, 2014, the Operating Partnership has recognized $49 million in equity earnings related to the amortization of the basis difference.
	Both our preferred and common interests are accounted for based on the equity method of accounting. Equity earnings of the Timberland Venture are first allocated to our preferred interest to the extent of our preferred return with any excess earnings allocated among the common interests based on ownership percentage (i.e., 9% to our common interest). All of the equity earnings will be allocated to our preferred interest in years in which our preferred return equals or exceeds the earnings of the Timberland Venture. To the extent of any shortfall in equity earnings (cumulative preferred return in excess of allocated equity earnings), future years’ earnings will be allocated to our preferred interest when the earnings of the Timberland Venture exceed our preferred return. At December 31, 2014, the cumulative shortfall in allocated equity earnings is $28 million. In addition to equity earnings associated with our common and preferred interests, equity earnings include the amortization of the difference between the book basis of our investment in the Timberland Venture and our share of the Timberland Venture’s net assets. Equity earnings for the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	54	$	53	$	51
	Common Interest	—		—		—
	Amortization of Basis Difference	9		10		8
	Total Equity Earnings from Timberland Venture	$	63	$	63	$	59
	Distributions from the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	56	$	55	$	56
	Common Interest	1		1		—
	Total Distributions from Timberland Venture	$	57	$	56	$	56
	As of December 31, 2014 and December 31, 2013, the undistributed earnings from the Timberland Venture were $33 million and $27 million, respectively.
	The Timberland Venture can only be liquidated with the consent of both members. However, upon the nine year anniversary of the Timberland Venture, PC Member has the right for a six-month period to cause the Timberland Venture to redeem the other member’s interest. The other Timberland Venture member has a similar redemption right after the seven year anniversary (October 1, 2015 to March 31, 2016). Upon liquidation or redemption, the members’ interests (i.e. capital accounts) will be adjusted to reflect the fair value of the Timberland Venture’s net assets. The adjustment would first be allocated to our preferred interest if there exists an accumulated shortfall in net income attributable to our preferred interest but only to the extent that the fair value of the net assets of the Timberland Venture exceed book basis.
	For the years ended December 31, 2014, 2013, and 2012, the Timberland Venture was considered a Significant Subsidiary in accordance with the financial reporting requirements of the Securities and Exchange Commission. Accordingly, the audited financial statements of the Timberland Venture are attached as an exhibit to Plum Creek’s 2014 Form 10-K filing.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entities	VARIABLE INTEREST ENTITIES
	Real Estate Development Ventures. The MWV-Charleston Land Partners, LLC (“MWV-CLP”) (see Note 18 of the Notes to Consolidated Financial Statements) is a variable interest entity. The primary activities of MWV-CLP are the active development of residential and commercial real estate on approximately 22,000 acres ("Class A Properties") and the identification, entitlement, marketing, and selling of approximately 71,000 acres of high-value rural and development-quality lands ("Class B Properties"). MWV-CLP is managed by an affiliate of MeadWestvaco Corporation ("MWV"). MWV-CLP is financed by regular capital calls from the manager of MWV-CLP in proportion to a member’s ownership interest. If a member does not make a capital contribution, the member’s ownership interest is diluted. The company has committed to contribute capital of at least $39 million over the next six years in connection with its interest in Class B Properties. The company has not provided any financing for MWV-CLP other than its initial capital contribution of $152 million in 2013 and its ongoing capital calls under the LLC agreement. Capital contributions of $9 million were made during 2014. The company does not intend to provide any other sources of financing for MWV-CLP.
	The company is not the primary beneficiary of MWV-CLP. The company considers the activities that most significantly impact the economic performance of MWV-CLP to be the day-to-day operating decisions along with the oversight responsibilities for the real estate development projects and properties. MWV has the power to direct the activities of MWV-CLP that most significantly impact its economic performance through its ability to manage the day-to-day operations of MWV-CLP. MWV also has the ability to control all management decisions associated with the 22,000 acres of Class A Properties through its majority representation on the board of directors for the Class A Properties and its joint control of the Class B Properties due to its equal representation on the board of directors for the Class B Properties.
	The carrying amount of our investment in MWV-CLP is $126 million at December 31, 2014 and $139 million at December 31, 2013 and is reported in the Consolidated Balance Sheets as Equity Investment in Real Estate Development Ventures. Our maximum exposure to loss is $126 million, our carrying amount of our investment, plus any future capital contributions we elect to contribute to MWV-CLP. At a minimum, the company has agreed to make capital contributions in connection with its interest in Class B Properties of $39 million over the next six years. The company has a 50% ownership interest in the Class B Properties; and therefore, is entitled to 50% of the earnings or losses associated with these properties. Additionally, the company has a 4% ownership interest in the Class A Properties in which it is generally entitled to 4% of the earnings or losses associated with these properties.
	Timberland Venture. The Timberland Venture (see Note 18 of the Notes to Consolidated Financial Statements) is a variable interest entity. The primary operating activities of the Timberland Venture consist of owning timberlands and entering into cutting contracts with an affiliate of the other member. Besides quarterly interest payments on the Note Payable to Timberland Venture, the company has not provided financing or other support to the venture. The venture generates sufficient cash from operating activities to finance its operations.
	We are not the primary beneficiary of the Timberland Venture. The company does not manage the day-to-day operations of the Timberland Venture, has only limited protective rights and its involvement is generally limited to receiving distributions on its preferred and common interests. We are not the primary beneficiary because we do not direct the activities that most significantly impact the Timberland Venture’s economic performance. We believe that the activities that most significantly impact the Timberland Venture’s economic performance include managing the timberlands along with the timing and extent of the harvesting activities, neither of which we control.
	The carrying amount of the investment is $217 million at December 31, 2014 and $211 million at December 31, 2013, and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $217 million, the carrying amount of the investment. Generally, losses are first allocated among the common interests based on positive capital accounts in which we hold a 9% common interest. No losses are allocated to our preferred interest ($705 million) until the common interests have absorbed losses of approximately $861 million.
PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entities	VARIABLE INTEREST ENTITIES
	Real Estate Development Ventures. The MWV-Charleston Land Partners, LLC (“MWV-CLP”) (see Note 16 of the Notes to Consolidated Financial Statements) is a variable interest entity. The primary activities of MWV-CLP are the active development of residential and commercial real estate on approximately 22,000 acres ("Class A Properties") and the identification, entitlement, marketing, and selling of approximately 71,000 acres of high-value rural and development-quality lands ("Class B Properties"). MWV-CLP is managed by an affiliate of MeadWestvaco Corporation ("MWV"). MWV-CLP is financed by regular capital calls from the manager of MWV-CLP in proportion to a member’s ownership interest. If a member does not make a capital contribution, the member’s ownership interest is diluted. The Operating Partnership has committed to contribute capital of at least $39 million over the next six years in connection with its interest in Class B Properties. The Operating Partnership has not provided any financing for MWV-CLP other than its initial capital contribution of $152 million in 2013 and its ongoing capital calls under the LLC agreement. Capital contributions of $9 million were made during 2014. The Operating Partnership does not intend to provide any other sources of financing for MWV-CLP.
	The Operating Partnership is not the primary beneficiary of MWV-CLP. The Operating Partnership considers the activities that most significantly impact the economic performance of MWV-CLP to be the day-to-day operating decisions along with the oversight responsibilities for the real estate development projects and properties. MWV has the power to direct the activities of MWV-CLP that most significantly impact its economic performance through its ability to manage the day-to-day operations of MWV-CLP. MWV also has the ability to control all management decisions associated with the 22,000 acres of Class A Properties through its majority representation on the board of directors for the Class A Properties and its joint control of the Class B Properties due to its equal representation on the board of directors for the Class B Properties.
	The carrying amount of our investment in MWV-CLP is $126 million at December 31, 2014 and $139 million at December 31, 2013 and is reported in the Consolidated Balance Sheets as Equity Investment in Real Estate Development Ventures. Our maximum exposure to loss is $126 million, our carrying amount of our investment, plus any future capital contributions we elect to contribute to MWV-CLP. At a minimum, the Operating Partnership has agreed to make capital contributions in connection with its interest in Class B Properties of $39 million over the next six years. The Operating Partnership has a 50% ownership interest in the Class B Properties, and therefore, is entitled to 50% of the earnings or losses associated with these properties. Additionally, the Operating Partnership has a 4% ownership interest in the Class A Properties in which it is generally entitled to 4% of the earnings or losses associated with these properties.
	Timberland Venture. The Timberland Venture (see Note 16 of the Notes to Consolidated Financial Statements) is a variable interest entity. The primary operating activities of the Timberland Venture consist of owning timberlands and entering into cutting contracts with an affiliate of the other member. Besides quarterly distributions to PC Ventures which it uses to fund interest payments on the loan owed by PC Ventures, the Operating Partnership has not provided financing or other support to the venture. The venture generates sufficient cash from operating activities to finance its operations.
	We are not the primary beneficiary of the Timberland Venture. PC Member does not manage the day-to-day operations of the Timberland Venture, has only limited protective rights and its involvement is generally limited to receiving distributions on its preferred and common interests. We are not the primary beneficiary because we do not direct the activities that most significantly impact the Timberland Venture’s economic performance. We believe that the activities that most significantly impact the Timberland Venture’s economic performance include managing the timberlands along with the timing and extent of the harvesting activities, neither of which we control.
	The carrying amount of the investment is $217 million at December 31, 2014 and $211 million at December 31, 2013, and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $217 million, the carrying amount of the investment. Generally, losses are first allocated among the common interests based on positive capital accounts in which we hold a 9% common interest. No losses are allocated to our preferred interest ($705 million) until the common interests have absorbed losses of approximately $861 million.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Related Party Transactions	RELATED PARTY TRANSACTIONS
	The company has a common and preferred interest in Southern Diversified Timber, LLC (“the Timberland Venture”), which is accounted for under the equity method of accounting. See Note 18 of the Notes to Consolidated Financial Statements.
	Equity earnings and distributions from the Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Equity Earnings	$	63	$	63	$	59
	Distributions	57		56		56
	In 2008, the company borrowed $783 million from the Timberland Venture for a 10-year term at a fixed annual interest rate of 7.375%. The related party obligation is included in the Consolidated Balance Sheets as Note Payable to Timberland Venture. Interest expensed and paid with respect to the Note Payable to Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Interest Expense	$	58	$	58	$	58
	Interest Payments	58		58		58
	As a result, the company had accrued interest payable for the Note Payable to Timberland Venture of the following at December 31 (in millions):
		2014		2013
	Interest Payable (to related party)	$	7	$	7
PLUM CREEK TIMBERLANDS L P [Member]
Related Party Transactions	RELATED PARTY TRANSACTIONS
	Transactions with Parent. The Operating Partnership’s parent, Plum Creek Timber Company, Inc., provides share-based compensation plans that cover employees of the Operating Partnership (see Note 13 of the Notes to Consolidated Financial Statements). All of Plum Creek’s activities are conducted through the Operating Partnership. Therefore, all share-based compensation expense is allocated to the Operating Partnership.
	Transactions with Other Related Parties. A subsidiary of the Operating Partnership, Plum Creek Timber Operations I, LLC (“PC Member”) has a common and preferred interest in Southern Diversified Timber, LLC (“the Timberland Venture”), which is accounted for under the equity method of accounting. See Note 16 of the Notes to Consolidated Financial Statements. Equity earnings and distributions from the Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Equity Earnings	$	63	$	63	$	59
	Distributions	57		56		56
	In 2008, PC Ventures borrowed $783 million from the Timberland Venture for a 10-year term at a fixed annual interest rate of 7.375%. PC Ventures used the proceeds from the borrowing to make a $783 million capital contribution to the Operating Partnership in exchange for a Series T-1 Redeemable Preferred Limited Partnership Interest. See Note 11 of the Notes to Consolidated Financial Statements. The Operating Partnership made the following cash distributions to PC Ventures for the years ended December 31 (in millions):
		2014		2013		2012
	Cash Distributions	$	58	$	58	$	58

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Segment Information	SEGMENT INFORMATION
	The company is organized into seven operating segments based on the nature of the business activities of each component. Each operating segment has a separate management team. The measurement of operating segment results is generally consistent with the presentation of the Consolidated Statements of Income. Intersegment Revenues are recorded at market prices, which are determined at least quarterly, and are eliminated in the consolidated results. Several operating segments have sales outside of the U.S. (see Export Revenues), but the company does not hold any long-lived foreign assets. The company’s reportable segments are: (1) Northern Resources, (2) Southern Resources, (3) Real Estate, (4) Manufacturing, (5) Energy and Natural Resources, and (6) Other. The Other Segment is composed of two operating segments that do not meet the criteria to be individually reported or aggregated with another reportable segment.
	The company evaluates performance of the segments based on operating income before interest, unallocated corporate expenses and taxes. Asset information is not reported by segment, as the company does not produce such information internally.
	Northern Resources Segment. The Northern Resources Segment consists of timberlands located in Maine, Michigan, Montana, New Hampshire, Oregon, Vermont, Washington, West Virginia and Wisconsin. The Northern Resources Segment grows timber for sale primarily in domestic regional markets. Additionally, some logs are sold in export markets, mainly to China and Canada. The Northern Resources Segment sells softwood and hardwood sawlogs and softwood and hardwood pulpwood. Softwood and hardwood sawlogs are sold primarily to regional lumber and plywood manufacturers. Logs harvested in Montana are sold mostly to the company’s Manufacturing Segment (see Intersegment Revenues). Softwood and hardwood pulpwood is sold to regional paper and packaging manufacturers.
	Southern Resources Segment. The Southern Resources Segment consists of timberlands located in Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Texas and Virginia. The Southern Resources Segment grows timber for sale in domestic regional markets. The Southern Resources Segment sells primarily softwood sawlogs and pulpwood. Additionally, some logs are sold in export markets, mainly to Europe and Asia. Softwood sawlogs are sold to regional lumber and plywood manufacturers. Softwood pulpwood is sold to regional paper and packaging manufacturers, producers of oriented strand board, and producers of wood pellets for use in bioenergy. Additionally, the Southern Resources Segment leases its timberlands to third parties on an annual basis for recreational purposes.
	Real Estate Segment. The Real Estate Segment consists of sales of higher value timberlands and non-strategic timberlands. We estimate that included in the company’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation, commercial and residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. The company has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller scale transactions over the near and medium term. In addition to these 225,000 acres, the company may also make sales of non-strategic timberlands in larger scale transactions to commercial timberland buyers as opportunities arise. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
	Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries. Properties developed internally by the company will generally be low-intensity development limited to obtaining entitlements. Larger and more complicated projects needing more invested capital may be developed through third party ventures.
	Manufacturing Segment. The Manufacturing Segment consists of two lumber mills, two plywood mills, two medium density fiberboard (“MDF”) facilities in Montana and one lumber remanufacturing facility in Idaho. The lumber facilities produce boards, studs, and dimension lumber and the panel facilities produce high-quality plywood and MDF panels. All of these products are targeted to domestic wood products retailers, home construction, industrial customers, and to a lesser extent, for export primarily to Canada and Mexico. Residual chips that are not used internally may be sold to regional pulp and paper manufacturers. Revenues from the Manufacturing Segment by product line were as follows for the years ended December 31 (in millions):
			2014			2013			2012
	Lumber		$	109		$	95		$	78
	Plywood		87			92			91
	MDF		172			175			155
	Total		$	368		$	362		$	324
	Energy and Natural Resources Segment. The Energy and Natural Resources Segment consists primarily of the net earnings derived from the company's non-timber natural resources. The Segment includes overriding royalties in connection with the company's ownership of aggregate mineral rights. The overriding royalties are earned as the underlying aggregates are sold. These mineral rights exist at four quarries in South Carolina and four quarries in Georgia, all of which are operated by Vulcan Materials Company. The Segment also includes royalties from third-party lessees associated with the extraction of oil, natural gas, aggregates and other minerals, and wind leases from the lands the company owns. Additionally, the Energy and Natural Resources Segment includes revenues the company earns in connection with granting oil and gas exploration rights and communication and transportation rights of way. Some of the Energy and Natural Resources Segment’s activities are conducted through the company's wholly-owned taxable REIT subsidiaries.
	Other Segment. The Other Segment includes revenues and expenses associated with our new business of providing timber and wood-fiber procurement services by the harvesting and selling of trees from timberlands that are not owned by the company. Additionally, equity earnings (losses) associated with the company's investment in MWV-Charleston Land Partners, LLC (see Note 18 of the Notes to Consolidated Financial Statements) are reported in the Other Segment. These activities are conducted through our wholly-owned taxable REIT subsidiaries. There were no similar activities in 2013 or 2012.
	The tables below present information about reported segments for the years ended December 31 (in millions):
		Northern			Southern			Real			Manufacturing(C)		Energy and Natural Resources(D)		Other(E)		Total(F)
		Resources(A)			Resources			Estate(B)
	2014
	External Revenues	$	236		$	531		$	289		$	368	$	34	$	18	$	1,476
	Intersegment Revenues	28			—			—			—		—		—		28
	Export Revenues	10			9			—			28		—		—		47
	Depreciation, Depletion and Amortization	28			82			1			14		8		—		133
	Basis of Real Estate Sold	—			—			129			—		—		—		129
	Other Operating Gain	—			—			—			11		2		—		13
	Equity Earnings	—			—			—			—		—		3		3
	Operating Income	44			137			133			49		25		2		390
	2013
	External Revenues	$	234		$	435		$	286		$	362	$	23	$	—	$	1,340
	Intersegment Revenues	26			—			—			—		—		—		26
	Export Revenues	15			6			—			29		—		—		50
	Depreciation, Depletion and Amortization	30			65			1			16		3		—		115
	Basis of Real Estate Sold	—			—			91			—		—		—		91
	Other Operating Gain	—			—			—			—		1		—		1
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	32			108			169			43		19		—		371
	2012
	External Revenues	$	224		$	417		$	352		$	324	$	22	$	—	$	1,339
	Intersegment Revenues	22			—			—			—		—		—		22
	Export Revenues	19			2			—			32		—		—		53
	Depreciation, Depletion and Amortization	26			67			1			15		1		—		110
	Basis of Real Estate Sold	—			—			138			—		—		—		138
	Other Operating Gain	—			—			—			—		—		—		—
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	20			90			187			29		19		—		345
	(A)	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
	(B)	The company recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 5 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
	(C)	During 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(D)	During 2014, the company agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the company sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(E)	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.
	(F)	Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $3 million, $4 million, and $4 million for 2014, 2013 and 2012, respectively.
	A reconciliation of total segment operating income to income before income taxes is presented below for the years ended December 31 (in millions):
		2014			2013			2012
	Total Segment Operating Income	$	390		$	371		$	345
	Corporate and Other Unallocated Expenses	(67		)	(73		)	(65		)
	Other Unallocated Operating Income (Expense), net	2			(3		)	1
	Equity Earnings from Timberland Venture	63			63			59
	Total Interest Expense, net	(166		)	(141		)	(140		)
	Loss on Extinguishment of Debt	—			(4		)	—
	Income before Income Taxes	$	222		$	213		$	200
PLUM CREEK TIMBERLANDS L P [Member]
Segment Information	SEGMENT INFORMATION
	The Operating Partnership is organized into seven operating segments based on the nature of the business activities of each component. Each operating segment has a separate management team. The measurement of operating segment results is generally consistent with the presentation of the Consolidated Statements of Income. Intersegment Revenues are recorded at market prices, which are determined at least quarterly, and are eliminated in the consolidated results. Several operating segments have sales outside of the U.S. (see Export Revenues), but the Operating Partnership does not hold any long-lived foreign assets. The Operating Partnership’s reportable segments are: (1) Northern Resources, (2) Southern Resources, (3) Real Estate, (4) Manufacturing, (5) Energy and Natural Resources, and (6) Other. The Other Segment is composed of two operating segments that do not meet the criteria to be individually reported or aggregated with another reportable segment.
	The Operating Partnership evaluates performance of the segments based on operating income before interest, unallocated corporate expenses and taxes. Asset information is not reported by segment, as the Operating Partnership does not produce such information internally.
	Northern Resources Segment. The Northern Resources Segment consists of timberlands located in Maine, Michigan, Montana, New Hampshire, Oregon, Vermont, Washington, West Virginia and Wisconsin. The Northern Resources Segment grows timber for sale primarily in domestic regional markets. Additionally, some logs are sold in export markets, mainly to China and Canada. The Northern Resources Segment sells softwood and hardwood sawlogs and softwood and hardwood pulpwood. Softwood and hardwood sawlogs are sold primarily to regional lumber and plywood manufacturers. Logs harvested in Montana are sold mostly to the Operating Partnership’s Manufacturing Segment (see Intersegment Revenues). Softwood and hardwood pulpwood is sold to regional paper and packaging manufacturers.
	Southern Resources Segment. The Southern Resources Segment consists of timberlands located in Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Texas and Virginia. The Southern Resources Segment grows timber for sale in domestic regional markets. The Southern Resources Segment sells primarily softwood sawlogs and pulpwood. Additionally, some logs are sold in export markets, mainly to Europe and Asia. Softwood sawlogs are sold to regional lumber and plywood manufacturers. Softwood pulpwood is sold to regional paper and packaging manufacturers, producers of oriented strand board, and producers of wood pellets for use in bioenergy. Additionally, the Southern Resources Segment leases its timberlands to third parties on an annual basis for recreational purposes.
	Real Estate Segment. The Real Estate Segment consists of sales of higher value timberlands and non-strategic timberlands. We estimate that included in the Operating Partnership’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation, commercial and residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. The Operating Partnership has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller scale transactions over the near and medium term. In addition to these 225,000 acres, the Operating Partnership may also make sales of non-strategic timberlands in larger scale transactions to commercial timberland buyers as opportunities arise. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
	Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries. Properties developed internally by the Operating Partnership will generally be low-intensity development limited to obtaining entitlements. Larger and more complicated projects needing more invested capital may be developed through third party ventures.
	Manufacturing Segment. The Manufacturing Segment consists of two lumber mills, two plywood mills, two medium density fiberboard (“MDF”) facilities in Montana and one lumber remanufacturing facility in Idaho. The lumber facilities produce boards, studs, and dimension lumber and the panel facilities produce high-quality plywood and MDF panels. All of these products are targeted to domestic wood products retailers, home construction, industrial customers, and to a lesser extent, for export primarily to Canada and Mexico. Residual chips that are not used internally may be sold to regional pulp and paper manufacturers. Revenues from the Manufacturing Segment by product line were as follows for the years ended December 31 (in millions):
			2014			2013			2012
	Lumber		$	109		$	95		$	78
	Plywood		87			92			91
	MDF		172			175			155
	Total		$	368		$	362		$	324
	Energy and Natural Resources Segment. The Energy and Natural Resources Segment consists primarily of the net earnings derived from the Operating Partnership's non-timber natural resources. The Segment includes overriding royalties in connection with the Operating Partnership's ownership of aggregate mineral rights. The overriding royalties are earned as the underlying aggregates are sold. These mineral rights exist at four quarries in South Carolina and four quarries in Georgia, all of which are operated by Vulcan Materials Company. The Segment also includes royalties from third-party lessees associated with the extraction of oil, natural gas, aggregates and other minerals, and wind leases from the lands the Operating Partnership owns. Additionally, the Energy and Natural Resources Segment includes revenues the Operating Partnership earns in connection with granting oil and gas exploration rights and communication and transportation rights of way. Some of the Energy and Natural Resources Segment’s activities are conducted through the Operating Partnership's wholly-owned taxable REIT subsidiaries.
	Other Segment. The Other Segment includes revenues and expenses associated with our new business of providing timber and wood-fiber procurement services by the harvesting and selling of trees from timberlands that are not owned by the Operating Partnership. Additionally, equity earnings (losses) associated with the Operating Partnership's investment in MWV-Charleston Land Partners, LLC (see Note 16 of the Notes to Consolidated Financial Statements) are reported in the Other Segment. These activities are conducted through our wholly-owned taxable REIT subsidiaries. There were no similar activities in 2013 or 2012.
	The tables below present information about reported segments for the years ended December 31 (in millions):
		Northern			Southern			Real			Manufacturing(C)		Energy and Natural Resources(D)		Other(E)		Total(F)
		Resources(A)			Resources			Estate(B)
	2014
	External Revenues	$	236		$	531		$	289		$	368	$	34	$	18	$	1,476
	Intersegment Revenues	28			—			—			—		—		—		28
	Export Revenues	10			9			—			28		—		—		47
	Depreciation, Depletion and Amortization	28			82			1			14		8		—		133
	Basis of Real Estate Sold	—			—			129			—		—		—		129
	Other Operating Gain	—			—			—			11		2		—		13
	Equity Earnings	—			—			—			—		—		3		3
	Operating Income	44			137			133			49		25		2		390
	2013
	External Revenues	$	234		$	435		$	286		$	362	$	23	$	—	$	1,340
	Intersegment Revenues	26			—			—			—		—		—		26
	Export Revenues	15			6			—			29		—		—		50
	Depreciation, Depletion and Amortization	30			65			1			16		3		—		115
	Basis of Real Estate Sold	—			—			91			—		—		—		91
	Other Operating Gain	—			—			—			—		1		—		1
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	32			108			169			43		19		—		371
	2012
	External Revenues	$	224		$	417		$	352		$	324	$	22	$	—	$	1,339
	Intersegment Revenues	22			—			—			—		—		—		22
	Export Revenues	19			2			—			32		—		—		53
	Depreciation, Depletion and Amortization	26			67			1			15		1		—		110
	Basis of Real Estate Sold	—			—			138			—		—		—		138
	Other Operating Gain	—			—			—			—		—		—		—
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	20			90			187			29		19		—		345
	(A)	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
	(B)	The Operating Partnership recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 4 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
	(C)	During 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(D)	During 2014, the Operating Partnership agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the Operating Partnership sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(E)	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.
	(F)	Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $3 million, $4 million, and $4 million for 2014, 2013 and 2012, respectively.
	A reconciliation of total segment operating income to income before income taxes is presented below for the years ended December 31 (in millions):
		2014			2013			2012
	Total Segment Operating Income	$	390		$	371		$	345
	Corporate and Other Unallocated Expenses	(67		)	(73		)	(65		)
	Other Unallocated Operating Income (Expense), net	2			(3		)	1
	Equity Earnings from Timberland Venture	63			63			59
	Interest Expense, net	(108		)	(83		)	(82		)
	Loss on Extinguishment of Debt	—			(4		)	—
	Income before Income Taxes	$	280		$	271		$	258

Subsequent_Events

Subsequent Events (PLUM CREEK TIMBER CO INC [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Subsequent Events	SUBSEQUENT EVENTS
	Quarterly Dividend. On February 4, 2015, the Board of Directors authorized the company to make a dividend payment of $0.44 per share, or approximately $77 million, which will be paid on February 27, 2015 to stockholders of record on February 13, 2015.

Unaudited_Selected_Quarterly_F

Unaudited Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Unaudited Selected Quarterly Financial Data	UNAUDITED SELECTED QUARTERLY FINANCIAL DATA
	(In Millions, Except per Share Amounts)		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (C)
	2014
	Revenues		$	317	$	356	$	375	$	428
	Gross Profit		85		109		109		119
	Operating Income (A)		57		82		91		92
	Net Income		30		55		61		68
	Net Income per Share—Basic (B)		$	0.17	$	0.31	$	0.34	$	0.39
	Net Income per Share—Diluted (B)		$	0.17	$	0.31	$	0.34	$	0.39
	2013
	Revenues		$	340	$	303	$	366	$	331
	Gross Profit		110		90		122		98
	Operating Income		78		62		91		64
	Net Income		56		46		72		40
	Net Income per Share—Basic (B)		$	0.35	$	0.28	$	0.44	$	0.24
	Net Income per Share—Diluted (B)		$	0.35	$	0.28	$	0.44	$	0.24
	(A)	During the second quarter of 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 21 of the Notes to Consolidated Financial Statements.
	(B)	Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may not equal the total computed for the year.
	(C)	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.
PLUM CREEK TIMBERLANDS L P [Member]
Unaudited Selected Quarterly Financial Data	UNAUDITED SELECTED QUARTERLY FINANCIAL DATA
	(In Millions)		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (B)
	2014
	Revenues		$	317	$	356	$	375	$	428
	Gross Profit		85		109		109		119
	Operating Income (A)		57		82		91		92
	Net Income Available to Common Interest Partners		30		55		61		68
	2013
	Revenues		$	340	$	303	$	366	$	331
	Gross Profit		110		90		122		98
	Operating Income		78		62		91		64
	Net Income Available to Common Interest Partners		56		46		72		40
	(A)	During the second quarter of 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 19 of the Notes to Consolidated Financial Statements.
	(B)	During the fourth quarter of 2013, the Operating Partnership prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 9 of the Notes to Consolidated Financial Statements.

Supplemental_Disclosures

Supplemental Disclosures	12 Months Ended
	Dec. 31, 2014
Supplemental Disclosures Abstract
Supplemental Disclosures	Included in this item are the consolidated financial statements related to Plum Creek Timberlands, L.P., a Delaware Limited Partnership and a wholly-owned subsidiary of Plum Creek Timber Company, Inc. These financial statements are provided pursuant to Rule 3-10 of Regulation S-X in connection with the shelf registration statement on Form S-3 filed in November of 2014 pursuant to which Plum Creek Timberlands, L.P. has registered and from time to time may offer and sell debt securities. As of December 31, 2014, Plum Creek Timberlands, L.P. has publicly issued and outstanding $1,333 million aggregate principal amount of Senior Notes ("Public Debt") pursuant to the shelf registration statement.

Accounting_Policies_Policy

Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
General	General. Plum Creek Timber Company, Inc. (“Plum Creek,” “the company,” “we,” “us,” or “our”), a Delaware Corporation, is a real estate investment trust, or “REIT”, for federal income tax purposes. Plum Creek Timber Company, Inc. is also the parent company of its wholly-owned subsidiary Plum Creek Timberlands, L.P. (“the Partnership”), a Delaware Limited Partnership. At December 31, 2014, the company owned and managed approximately 6.6 million acres of timberlands in the Northwest, Southern and Northeast United States, and owned seven wood product conversion facilities in the Northwest United States. Included in the 6.6 million acres are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the company has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
Basis of Presentation	Basis of Presentation. The consolidated financial statements of the company include the accounts of Plum Creek Timber Company, Inc. and its subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. All transactions are denominated in United States dollars.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Concentrations Disclosure	Customer Concentrations. Annual revenues from the company’s largest customer accounted for 7% of total annual revenues in 2014, 2013, and 2012. If market conditions for wood products were to deteriorate, the loss of this customer could have a significant effect on the company’s results of operations.
	Product Concentrations. Sales of the company’s timber and wood products are dependent upon the economic conditions of the housing, repair and remodeling, industrial, and pulp and paper industries. Sales of the company’s timberlands are dependent upon the general economic conditions in the United States, interest rates and the availability of buyer financing from financial institutions, not-for-profit organizations and government sources. As a result of these product concentrations, a prolonged decline in these markets could have a significant impact on the company’s results of operations.
Revenue Recognition	Revenue Recognition.
	Resources Revenue. Timber sales revenues are recognized when legal ownership and the risk of loss transfers to the purchaser and the quantity sold is determinable. The company sells timber under delivered log agreements as well as through sales of standing timber (or “stumpage”). For delivered sales, revenue, which includes amounts billed for shipping and handling (logging and hauling of timber), is recognized when the log is delivered to the customer. Stumpage is sold using pay-as-cut or, less frequently, using timber deed sale agreements. Under a pay-as-cut sales contract, the purchaser acquires the right to harvest specified timber on a tract, at an agreed upon price per unit. The sale and any related advances are recognized as revenue as the purchaser harvests the timber on the tract. Under a timber deed sale, the buyer agrees to purchase and harvest specified timber on a tract of land over the term of the contract (usually 18 months or less). Unlike a pay-as-cut sales contract, risk of loss and title to the trees transfer to the buyer when the contract is signed. The buyer also pays the full purchase price when the contract is signed. Revenue from a timber deed sale is recognized when the contract is signed.
	Manufacturing Revenue. Revenues generated from the sale of lumber, plywood, medium density fiberboard (“MDF”) and related by-products (primarily wood chips), and amounts billed for shipping and handling are recognized at the time of delivery.
	Real Estate Revenue. Revenue from the sale of real estate is recognized when the sale has been consummated, the buyer’s initial and ongoing payments are adequate, the risks and rewards of owning the property have transferred to the buyer, and the company has no continuing involvement with the property. For all of our real estate sales, the company receives the entire consideration in cash at closing. Also at closing, the risks and rewards of ownership transfer to the buyer and the company does not have a continuing involvement in our properties after they are sold. Therefore, real estate revenue is recognized at closing.
	Revenue from real estate development projects is generally recognized under the full accrual method of accounting because sales generally do not commence until the project is completed. Broker commissions and closing costs of our Real Estate Segment are included in Cost of Goods Sold.
	The company will occasionally sell timberlands to a single buyer under a multi-period contract covering a series of prescheduled closings and/or options. Under these multi-period contracts, once title and risk of loss have transferred to the buyer for individual properties, the properties sold cannot be returned for a refund. However, deposits for future closings under multi-period contracts may be refunded under certain circumstances. The company treats each closing under a multi-period arrangement as a separate sale. Revenue in connection with a multi-period contract is generally recognized at closing equal to the lesser of the non-refundable consideration received or an allocation of total consideration based on fair value.
	Revenue generated from real estate sales includes the sale of higher value timberlands, non-strategic timberlands and large blocks of timberlands. In some of these transactions, the company sells timberlands that qualify for like-kind (tax-deferred) exchange treatment under the Internal Revenue Code. Substantially all of these sales involve a third party intermediary, whereby the third party intermediary receives proceeds related to the property sold and then reinvests the proceeds in like-kind property. The proceeds are recorded as revenue when the third party intermediary receives them. See “Like-Kind Exchanges”.
	Energy and Natural Resources Revenue. Overriding royalties earned in connection with aggregate mineral rights are recognized as revenue when the underlying aggregates are sold and the company is entitled to its share of the gross selling price. Additionally, royalties from aggregates leases and oil and gas leases are recognized as revenue when the underlying minerals are sold and the company is entitled to its share of the gross selling price. Generally, the mineral owners and lessees make payments to the company based on a percentage of the gross sales price of the minerals they sell. For overriding royalty and lease agreements with varying royalty percentages, revenue recognition is based on the relative-selling-price method, which may result in the deferral of revenue to future periods.
	Also, included within oil and gas royalties are lease bonus payments, which are typically paid upon the execution of a lease. Lease bonus payments are initially recorded as deferred revenue and are generally recognized as revenue over the period the lessee is entitled to explore for oil and gas. Certain of the company’s leases are also subject to minimum annual payments. In some cases, lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is also recognized as revenue upon the expiration of the lessee’s ability to recoup the payments.
Cash and Cash Equivalents	Cash and Cash Equivalents. All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents. Substantially all of the cash and cash equivalents are invested in money market funds.
Accounts Receivable	Accounts Receivable.  Accounts receivable is presented net of an allowance for doubtful accounts of $0.2 million at both December 31, 2014 and December 31, 2013. Accounts are deemed past due based on payment terms. The allowance for doubtful accounts represents management’s estimate and is based on historical losses, recent collection history, credit ratings of individual customers and existing economic conditions. Delinquent accounts are charged against the allowance for doubtful accounts to the extent and at the time they are deemed uncollectible.
Like-Kind Exchanges	Like-Kind Exchanges. Plum Creek may enter into like-kind (tax-deferred) exchange transactions to acquire and sell assets, principally timberlands. These transactions may include both forward (timberlands sold, followed by reinvestment of proceeds to acquire timberlands) and reverse (timberlands purchased, followed by receipt of proceeds from timberland sales) like-kind exchanges. The company uses a qualified escrow and/or trust account to facilitate like-kind exchange transactions. Funds from forward like-kind exchange transactions are restricted from being used until the funds are either successfully reinvested in timber and timberlands or the exchange fails and the proceeds are distributed to the company.
Inventories	Inventories. Logs, work-in-process and finished goods are stated at the lower of cost or market using the average cost method. A separate lower of cost or market analysis is prepared for each product line (i.e. lumber, plywood and MDF). Net realizable value is determined based on actual selling prices at the end of the accounting period. Losses on firm purchase commitments for logs are recorded when the related manufactured finished products are expected to be sold at a loss based on current product prices. Supplies inventories are stated at cost. Costs for manufactured inventories include raw materials, labor, supplies, energy, depreciation and production overhead. Cost of log inventories include timber depletion, stumpage, associated logging and harvesting costs, road costs and production overhead.
Timber and Timberlands	Timber and Timberlands. Timber (including timber deeds and logging roads) and timberlands are stated at cost less accumulated depletion for timber previously harvested and accumulated road amortization. The company capitalizes timber and timberland purchases along with reforestation costs and other costs associated with the planting and growing of timber, such as site preparation, growing or purchases of seedlings, planting, fertilization, herbicide application and the thinning of tree stands to improve growth. The company presents timber and timberland purchases and the capitalized costs described above under Investing Activities on the Consolidated Statements of Cash Flows. A timber deed, also called timber cutting rights, allows the company to harvest timber on timberlands it does not own over a specific time period (currently less than 10 years). The company capitalizes timber deed acquisitions. The company presents timber deed acquisitions under Operating Activities on the Consolidated Statements of Cash Flows. Timber carrying costs, such as real estate taxes, insect control, wildlife control, leases of timberlands (other than lease payments for the purchase of standing timber, in which case the payments are capitalized) and forest management personnel salaries and fringe benefits, are expensed as incurred. Costs of major roads are capitalized and amortized over 30 years. Costs for roads that are built to access multiple logging sites over numerous years are capitalized and amortized over 6 years. Costs for roads built to access a single logging site are expensed as incurred.
	Costs attributable to timber harvested, or depletion, are charged against income as trees are harvested. Depletion rates are determined annually based on the relationship between net carrying value of the timber plus certain capitalizable silviculture costs expected to be incurred over the harvest cycle and total timber volume estimated to be harvested over the harvest cycle. The depletion rate does not include an estimate for either future reforestation costs associated with a stand’s final harvest or future volume in connection with the replanting of a stand subsequent to its final harvest. Net carrying value of the timber and timberlands is used to compute the gain or loss in connection with timberland sales.
Minerals and Mineral Rights Policy	Minerals and Mineral Rights. Minerals and mineral rights are stated at cost less accumulated depletion. The company capitalizes the cost of obtaining minerals and mineral rights. The cost of minerals (primarily coal assets) are charged against income (depletion expense) using the units-of-production method, based on estimated recoverable reserves.
	The costs of mineral rights are charged against income (depletion expense) as the company recognizes royalty income from the sale of the products extracted from the quarries. Depletion rates are determined annually based on the relationship between the net carrying value of the mineral rights over the estimated remaining tons of mineral reserves.
	The company evaluates its minerals and mineral rights for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its mineral rights and coal assets to be a separate asset group based on identifiable cash flows.
Real Estate Held for Development and Sale, Policy	Higher and Better Use Timberlands / Real Estate Development. We estimate that included in the company’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber. Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries.
	Costs associated with a specific real estate development project are capitalized when management estimates that it is probable that a project will be successful. Both external and internal expenditures directly associated with the specific real estate project are capitalized. The company will capitalize improvements and other development costs, including interest costs and property taxes, during the development period. General real estate development costs not related to a specific project and costs incurred before management has concluded that it is probable that a project will be successful (e.g. investigatory costs) are expensed as incurred. For real estate development projects with multiple parcels, the company determines the cost of the individual lots sold by allocating the historical cost of the land, timber, development and common construction costs on a relative sales value.
	Properties developed by the company will generally be low-intensity development limited to activities associated with obtaining entitlements. Capitalized real estate development costs, including the book basis in the related timber and timberlands associated with these developments, were $12 million and $13 million at December 31, 2014 and 2013, respectively. Substantially all of these properties are expected to be sold beyond one year and are included in Other Assets (non-current).
	The company also incurs development costs on some timberlands that are currently still managed for timber operations. These consist of larger and more complicated projects needing more invested capital. These projects have a longer timeframe and are not expected to be sold or developed in the near term. The capitalized development costs for these projects and the book basis of the related timber and timberlands were $37 million and $36 million at December 31, 2014 and December 31, 2013, respectively, and are included in Timber and Timberlands.
	The book basis of timberlands that are considered held for sale are presented in the Consolidated Balance Sheet as Assets Held for Sale. The total book basis for assets held for sale was $98 million at December 31, 2014 and $92 million at December 31, 2013. Generally, timberlands that are under contract to sell or are listed for sale through an independent broker or by a taxable REIT subsidiary and are expected to be sold within the next year are considered assets held for sale. The book basis of timberlands that do not meet the held for sale criteria is included in Timber and Timberlands.
	The company evaluates its real estate development projects for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its real estate development projects to be a separate asset group based on identifiable cash flows.
Accounting for Equity Method Investments	Accounting for Equity Method Investments. In 2013, the company and MeadWestvaco Corporation ("MWV") formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the company made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties. The company accounts for this interest under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in the Consolidated Statements of Income. See Note 18 of the Notes to Consolidated Financial Statements.
	In 2008, the company contributed 454,000 acres of timberlands located in its Southern Resources Segment to a timberland venture in exchange for a $705 million preferred interest and a $78 million common interest. The company accounts for these interests under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in our Consolidated Statements of Income. See Note 18 of the Notes to Consolidated Financial Statements.
Property, Plant, and Equipment	Property, Plant and Equipment. Property, plant and equipment are recorded at cost. Replacements of major units of property are capitalized, and the replaced units are retired. Replacement of minor components of property and repair and maintenance costs are charged to expense as incurred.
	The company evaluates its property, plant and equipment for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The company considers each of its manufacturing facilities to be a separate asset group based on identifiable cash flows.
	All property, plant and equipment other than manufacturing machinery (for lumber, plywood and MDF) are depreciated using the straight-line method over the estimated useful lives of the related assets. Manufacturing machinery and equipment are depreciated on either a straight-line basis or a units-of-production basis, which approximates a straight-line basis. Useful lives are 19 years for land improvements, 20 to 45 years for buildings, and 3 to 20 years for machinery and equipment. Leasehold improvements are depreciated over the lease term or estimated useful life, whichever is shorter. The cost and related accumulated depreciation of property sold or retired are removed from the accounts and any gain or loss is recorded. Depreciation expense, excluding impairment charges, was $21 million, $24 million, and $22 million for the years ended December 31, 2014, 2013, and 2012, respectively.
Grantor Trusts	Grantor Trusts. The company has a grantor trust that was established for deferred compensation and deferred Plum Creek shares. See Note 12 of the Notes to Consolidated Financial Statements. Deferred compensation assets, which include money market and mutual fund investments, are classified as “trading securities” and are carried at market value. Realized gains and losses and changes in unrealized gains and losses and a corresponding amount of compensation expense are recorded in the Consolidated Statements of Income.
	Plum Creek maintains another grantor trust, which the company uses to fund its non-qualified pension plan obligation. See Notes 12 and 14 of the Notes to Consolidated Financial Statements. Money market and mutual fund investments held by this trust are classified as “available for sale securities.” The investments are carried at market values on the company’s Consolidated Balance Sheets. Realized gains and losses are recognized in the Consolidated Statements of Income; changes in unrealized gains and losses are recorded as other comprehensive income or loss, unless an other than temporary impairment has occurred, in which case an impairment loss is recognized in the Consolidated Statements of Income.
Shipping and Handling Costs	Shipping and Handling Costs. Costs incurred for the transportation of timber and manufactured products are included in Cost of Goods Sold.
Accounting for Share-Based Compensation	Accounting for Share-Based Compensation. All share-based payments to employees are recognized in the income statement based on their fair values. The company uses the grant date fair values (the closing market price for its common stock) to value stock awards of restricted stock units and common stock. The company also grants share-based awards that are classified and accounted for as liabilities. These awards are valued using a Monte Carlo simulation.
Other Operating Income	Other Operating Income (Expense), net. The company will recognize gains and losses from miscellaneous asset sales, insurance recoveries, litigation settlements and other items which are reported in our Consolidated Statements of Income as Other Operating Income (Expense), net. See Note 21 of the Notes to Consolidated Financial Statements. Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1
Reclassifications	Reclassifications. Certain prior year amounts have been reclassified to conform to the 2014 presentation. The reclassifications had no impact on operating income or net income.
New Accounting Pronouncements	New Accounting Pronouncements. There were no new accounting standards adopted by the company during 2014 that had a material impact on the company's financial condition, results of operations or cash flows.
PLUM CREEK TIMBERLANDS L P [Member]
General	General. Plum Creek Timberlands, L.P. is a Delaware Limited Partnership and a wholly-owned subsidiary of Plum Creek Timber Company, Inc. (“Parent”), a Delaware Corporation and a real estate investment trust, or “REIT”. References herein to “the Operating Partnership,” “we,” “us,” or “our” relate to Plum Creek Timberlands, L.P. and all of its wholly-owned consolidated subsidiaries; references to “Plum Creek” or “Parent” relate to Plum Creek Timber Company, Inc. and all of its wholly-owned consolidated subsidiaries.
	At December 31, 2014, the Operating Partnership owned and managed approximately 6.6 million acres of timberlands in the Northwest, Southern and Northeast United States, and owned seven wood product conversion facilities in the Northwest United States. Included in the 6.6 million acres are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. In addition, the Operating Partnership has approximately 225,000 acres of non-strategic timberlands, which are expected to be sold in smaller acreage transactions over the near and medium term. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber.
Basis of Presentation	Basis of Presentation. The consolidated financial statements of the Operating Partnership include the accounts of Plum Creek Timberlands, L.P. and its subsidiaries. The Operating Partnership is 100% owned by Plum Creek. Plum Creek has no assets or liabilities other than its direct and indirect ownership interests in Plum Creek Timberlands, L.P. and its interest in Plum Creek Ventures I, LLC (“PC Ventures”), a 100% owned subsidiary of Plum Creek. The Parent has no operations other than its investment in these subsidiaries and transactions in its own equity, such as the issuance and/or repurchase of common stock and the receipt of proceeds from stock option exercises. Intercompany transactions and accounts between Plum Creek Timberlands, L.P. and its subsidiaries have been eliminated in consolidation. All transactions are denominated in United States dollars.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Concentrations Disclosure	Customer Concentrations. Annual revenues from the Operating Partnership’s largest customer accounted for 7% of total annual revenues in 2014, 2013, and 2012. If market conditions for wood products were to deteriorate, the loss of this customer could have a significant effect on the Operating Partnership’s results of operations.
	Product Concentrations. Sales of the Operating Partnership’s timber and wood products are dependent upon the economic conditions of the housing, repair and remodeling, industrial, and pulp and paper industries. Sales of the Operating Partnership’s timberlands are dependent upon the general economic conditions in the United States, interest rates and the availability of buyer financing from financial institutions, not-for-profit organizations and government sources. As a result of these product concentrations, a prolonged decline in these markets could have a significant impact on the Operating Partnership’s results of operations.
Revenue Recognition	Revenue Recognition.
	Resources Revenue. Timber sales revenues are recognized when legal ownership and the risk of loss transfers to the purchaser and the quantity sold is determinable. The Operating Partnership sells timber under delivered log agreements as well as through sales of standing timber (or “stumpage”). For delivered sales, revenue, which includes amounts billed for shipping and handling (logging and hauling of timber), is recognized when the log is delivered to the customer. Stumpage is sold using pay-as-cut or, less frequently, using timber deed sale agreements. Under a pay-as-cut sales contract, the purchaser acquires the right to harvest specified timber on a tract, at an agreed upon price per unit. The sale and any related advances are recognized as revenue as the purchaser harvests the timber on the tract. Under a timber deed sale, the buyer agrees to purchase and harvest specified timber on a tract of land over the term of the contract (usually 18 months or less). Unlike a pay-as-cut sales contract, risk of loss and title to the trees transfer to the buyer when the contract is signed. The buyer also pays the full purchase price when the contract is signed. Revenue from a timber deed sale is recognized when the contract is signed.
	Manufacturing Revenue. Revenues generated from the sale of lumber, plywood, medium density fiberboard (“MDF”) and related by-products (primarily wood chips), and amounts billed for shipping and handling, are recognized at the time of delivery.
	Real Estate Revenue. Revenue from the sale of real estate is recognized when the sale has been consummated, the buyer’s initial and ongoing payments are adequate, the risks and rewards of owning the property have transferred to the buyer, and the Operating Partnership has no continuing involvement with the property. For all of our real estate sales, the Operating Partnership receives the entire consideration in cash at closing. Also at closing, the risks and rewards of ownership transfer to the buyer and the Operating Partnership does not have a continuing involvement in our properties after they are sold. Therefore, real estate revenue is recognized at closing.
	Revenue from real estate development projects is generally recognized under the full accrual method of accounting because sales generally do not commence until the project is completed. Broker commissions and closing costs of our Real Estate Segment are included in Cost of Goods Sold.
	The Operating Partnership will occasionally sell timberlands to a single buyer under a multi-period contract covering a series of prescheduled closings and/or options. Under these multi-period contracts, once title and risk of loss have transferred to the buyer for individual properties, the properties sold cannot be returned for a refund. However, deposits for future closings under multi-period contracts may be refunded under certain circumstances. The Operating Partnership treats each closing under a multi-period arrangement as a separate sale. Revenue in connection with a multi-period contract is generally recognized at closing equal to the lesser of the non-refundable consideration received or an allocation of total consideration based on fair value.
	Revenue generated from real estate sales includes the sale of higher value timberlands, non-strategic timberlands and large blocks of timberlands. In some of these transactions, the Operating Partnership sells timberlands that qualify for like-kind (tax-deferred) exchange treatment under the Internal Revenue Code. Substantially all of these sales involve a third party intermediary, whereby the third party intermediary receives proceeds related to the property sold and then reinvests the proceeds in like-kind property. The proceeds are recorded as revenue when the third party intermediary receives them. See “Like-Kind Exchanges”.
	Energy and Natural Resources Revenue. Overriding royalties earned in connection with aggregate mineral rights are recognized as revenue when the underlying aggregates are sold and the Operating Partnership is entitled to its share of the gross selling price. Additionally, royalties from aggregates leases and oil and gas leases are recognized as revenue when the underlying minerals are sold and the Operating Partnership is entitled to its share of the gross selling price. Generally, the mineral owners and lessees make payments to the Operating Partnership based on a percentage of the gross sales price of the minerals they sell. For overriding royalty and lease agreements with varying royalty percentages, revenue recognition is based on the relative-selling-price method, which may result in the deferral of revenue to future periods.
	Also, included within oil and gas royalties are lease bonus payments, which are typically paid upon the execution of a lease. Lease bonus payments are initially recorded as deferred revenue and are generally recognized as revenue over the period the lessee is entitled to explore for oil and gas. Certain of the Operating Partnership's leases are also subject to minimum annual payments. In some cases, lessees must make minimum annual or quarterly payments which are generally recoupable over certain time periods. These minimum payments are recorded as deferred revenue when received. The deferred revenue attributable to the minimum payment is recognized as royalty revenue when the lessee recoups the minimum payment through production. The deferred revenue is also recognized as revenue upon the expiration of the lessee’s ability to recoup the payments.
Cash and Cash Equivalents	Cash and Cash Equivalents. All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents. Substantially all of the cash and cash equivalents are invested in money market funds.
Accounts Receivable	Accounts Receivable. Accounts receivable is presented net of an allowance for doubtful accounts of $0.2 million at both December 31, 2014 and December 31, 2013. Accounts are deemed past due based on payment terms. The allowance for doubtful accounts represents management’s estimate and is based on historical losses, recent collection history, credit ratings of individual customers and existing economic conditions. Delinquent accounts are charged against the allowance for doubtful accounts to the extent and at the time they are deemed uncollectible.
Like-Kind Exchanges	Like-Kind Exchanges. The Operating Partnership may enter into like-kind (tax-deferred) exchange transactions to acquire and sell assets, principally timberlands. These transactions may include both forward (timberlands sold, followed by reinvestment of proceeds to acquire timberlands) and reverse (timberlands purchased, followed by receipt of proceeds from timberland sales) like-kind exchanges. The Operating Partnership uses a qualified escrow and/or trust account to facilitate like-kind exchange transactions. Funds from forward like-kind exchange transactions are restricted from being used until the funds are either successfully reinvested in timber and timberlands or the exchange fails and the proceeds are distributed to the Operating Partnership.
Inventories	Inventories. Logs, work-in-process and finished goods are stated at the lower of cost or market using the average cost method. A separate lower of cost or market analysis is prepared for each product line (i.e. lumber, plywood and MDF). Net realizable value is determined based on actual selling prices at the end of the accounting period. Losses on firm purchase commitments for logs are recorded when the related manufactured finished products are expected to be sold at a loss based on current product prices. Supplies inventories are stated at cost. Costs for manufactured inventories include raw materials, labor, supplies, energy, depreciation and production overhead. Cost of log inventories include timber depletion, stumpage, associated logging and harvesting costs, road costs and production overhead.
Timber and Timberlands	Timber and Timberlands. Timber (including timber deeds and logging roads) and timberlands are stated at cost less accumulated depletion for timber previously harvested and accumulated road amortization. The Operating Partnership capitalizes timber and timberland purchases along with reforestation costs and other costs associated with the planting and growing of timber, such as site preparation, growing or purchases of seedlings, planting, fertilization, herbicide application and the thinning of tree stands to improve growth. The Operating Partnership presents timber and timberland purchases and the capitalized costs described above under Investing Activities on the Consolidated Statements of Cash Flows. A timber deed, also called timber cutting rights, allows the Operating Partnership to harvest timber on timberlands it does not own over a specific time period (currently less than 10 years). The Operating Partnership capitalizes timber deed acquisitions. The Operating Partnership presents timber deed acquisitions under Operating Activities on the Consolidated Statements of Cash Flows. Timber carrying costs, such as real estate taxes, insect control, wildlife control, leases of timberlands (other than lease payments for the purchase of standing timber, in which case the payments are capitalized) and forest management personnel salaries and fringe benefits, are expensed as incurred. Costs of major roads are capitalized and amortized over 30 years. Costs for roads that are built to access multiple logging sites over numerous years are capitalized and amortized over 6 years. Costs for roads built to access a single logging site are expensed as incurred.
	Costs attributable to timber harvested, or depletion, are charged against income as trees are harvested. Depletion rates are determined annually based on the relationship between net carrying value of the timber plus certain capitalizable silviculture costs expected to be incurred over the harvest cycle and total timber volume estimated to be harvested over the harvest cycle. The depletion rate does not include an estimate for either future reforestation costs associated with a stand’s final harvest or future volume in connection with the replanting of a stand subsequent to its final harvest. Net carrying value of the timber and timberlands is used to compute the gain or loss in connection with timberland sales.
Minerals and Mineral Rights Policy	Minerals and Mineral Rights. Minerals and mineral rights are stated at cost less accumulated depletion. The Operating Partnership capitalizes the cost of obtaining minerals and mineral rights. The cost of minerals (primarily coal assets) are charged against income (depletion expense) using the units-of-production method, based on estimated recoverable reserves.
	The costs of mineral rights are charged against income (depletion expense) as the Operating Partnership recognizes royalty income from the sale of the products extracted from the quarries. Depletion rates are determined annually based on the relationship between the net carrying value of the mineral rights over the estimated remaining tons of mineral reserves.
	The Operating Partnership evaluates its minerals and mineral rights for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its mineral rights and coal assets to be a separate asset group based on identifiable cash flows.
Real Estate Held for Development and Sale, Policy	Higher and Better Use Timberlands / Real Estate Development. We estimate that included in the Operating Partnership’s 6.6 million acres of timberlands are approximately 775,000 acres of higher value timberlands, which are expected to be sold and/or developed over the next fifteen years for recreational, conservation or residential purposes. Included within the 775,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 200,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. In the meantime, all of our timberlands continue to be managed productively in our business of growing and selling timber. Some of our real estate activities, including our real estate development business, are conducted through our wholly-owned taxable REIT subsidiaries.
	Costs associated with a specific real estate development project are capitalized when management estimates that it is probable that a project will be successful. Both external and internal expenditures directly associated with the specific real estate project are capitalized. The Operating Partnership will capitalize improvements and other development costs, including interest costs and property taxes, during the development period. General real estate development costs not related to a specific project and costs incurred before management has concluded that it is probable that a project will be successful (e.g. investigatory costs) are expensed as incurred. For real estate development projects with multiple parcels, the Operating Partnership determines the cost of the individual lots sold by allocating the historical cost of the land, timber, development and common construction costs on a relative sales value.
	Properties developed by the Operating Partnership will generally be low-intensity development limited to activities associated with obtaining entitlements. Capitalized real estate development costs, including the book basis in the related timber and timberlands associated with these developments, were $12 million and $13 million at December 31, 2014 and 2013, respectively. Substantially all of these properties are expected to be sold beyond one year and are included in Other Assets (non-current).
	The Operating Partnership also incurs development costs on some timberlands that are currently still managed for timber operations. These consist of larger and more complicated projects needing more invested capital. These projects have a longer timeframe and are not expected to be sold or developed in the near term. The capitalized development costs for these projects and the book basis of the related timber and timberlands were $37 million and $36 million at December 31, 2014 and December 31, 2013, respectively, and are included in Timber and Timberlands.
	The book basis of timberlands that are considered held for sale are presented in the Consolidated Balance Sheet as Assets Held for Sale. The total book basis for assets held for sale was $98 million at December 31, 2014 and $92 million at December 31, 2013. Generally, timberlands that are under contract to sell or are listed for sale through an independent broker or by a taxable REIT subsidiary and are expected to be sold within the next year are considered assets held for sale. The book basis of timberlands that do not meet the held for sale criteria is included in Timber and Timberlands.
	The Operating Partnership evaluates its real estate development projects for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its real estate development projects to be a separate asset group based on identifiable cash flows.
Accounting for Equity Method Investments	Accounting for Equity Method Investments. In 2013, the Operating Partnership and MeadWestvaco Corporation ("MWV") formed a limited liability company ("MWV-Charleston Land Partners, LLC") for which the Operating Partnership made a capital contribution, in cash, of $152 million and MWV contributed real estate development properties. The Operating Partnership accounts for this interest under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in the Consolidated Statements of Income. See Note 16 of the Notes to Consolidated Financial Statements.
	In 2008, a subsidiary of the Operating Partnership, Plum Creek Timber Operations I, LLC (“PC Member”), contributed 454,000 acres of timberlands located in its Southern Resources Segment to a timberland venture in exchange for a $705 million preferred interest and a $78 million common interest. The Operating Partnership accounts for these interests under the equity method of accounting. Earnings are recognized as Earnings from Unconsolidated Entities in our Consolidated Statements of Income. See Note 16 of the Notes to Consolidated Financial Statements.
Property, Plant, and Equipment	Property, Plant and Equipment. Property, plant and equipment are recorded at cost. Replacements of major units of property are capitalized, and the replaced units are retired. Replacement of minor components of property and repair and maintenance costs are charged to expense as incurred.
	The Operating Partnership evaluates its property, plant and equipment for potential impairment whenever circumstances indicate the book basis of an asset group may not be recoverable. The Operating Partnership considers each of its manufacturing facilities to be a separate asset group based on identifiable cash flows.
	All property, plant and equipment other than manufacturing machinery (for lumber, plywood and MDF) are depreciated using the straight-line method over the estimated useful lives of the related assets. Manufacturing machinery and equipment are depreciated on either a straight-line basis or a units-of-production basis, which approximates a straight-line basis. Useful lives are 19 years for land improvements, 20 to 45 years for buildings, and 3 to 20 years for machinery and equipment. Leasehold improvements are depreciated over the lease term or estimated useful life, whichever is shorter. The cost and related accumulated depreciation of property sold or retired are removed from the accounts and any gain or loss is recorded. Depreciation expense, excluding impairment charges, was $21 million, $24 million, and $22 million for the years ended December 31, 2014, 2013, and 2012, respectively.
Grantor Trusts	Grantor Trusts. The Operating Partnership has a grantor trust that was established for deferred compensation and deferred Plum Creek shares. See Note 10 of the Notes to Consolidated Financial Statements. Deferred compensation assets, which include money market and mutual fund investments, are classified as “trading securities” and are carried at market value. Realized gains and losses and changes in unrealized gains and losses and a corresponding amount of compensation expense are recorded in the Consolidated Statements of Income.
	The Operating Partnership maintains another grantor trust, which the Operating Partnership uses to fund its non-qualified pension plan obligation. See Notes 10 and 12 of the Notes to Consolidated Financial Statements. Money market and mutual fund investments held by this trust are classified as “available for sale securities.” The investments are carried at market values on the Operating Partnership’s Consolidated Balance Sheets. Realized gains and losses are recognized in the Consolidated Statements of Income; changes in unrealized gains and losses are recorded as other comprehensive income or loss, unless an other than temporary impairment has occurred, in which case an impairment loss is recognized in the Consolidated Statements of Income.
Shipping and Handling Costs	Shipping and Handling Costs. Costs incurred for the transportation of timber and manufactured products are included in Cost of Goods Sold.
Accounting for Share-Based Compensation	Accounting for Share-Based Compensation. All share-based payments to employees are recognized in the income statement based on their fair values. The Operating Partnership uses the grant date fair values (the closing market price for Plum Creek’s common stock) to value Plum Creek stock awards of restricted stock units and common stock. Plum Creek also grants share-based awards that are classified and accounted for as liabilities. These awards are valued using a Monte Carlo simulation.
Other Operating Income	Other Operating Income (Expense), net. The Operating Partnership will recognize gains and losses from miscellaneous asset sales, insurance recoveries, litigation settlements and other items which are reported in our Consolidated Statements of Income as Other Operating Income (Expense), net. See Note 19 of the Notes to Consolidated Financial Statements. Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1
Reclassifications	Reclassifications. Certain prior year amounts have been reclassified to conform to the 2014 presentation. The reclassifications had no impact on operating income or net income.
New Accounting Pronouncements	New Accounting Pronouncements. There were no new accounting standards adopted by the Operating Partnership during 2014 that had a material impact on the Operating Partnership's financial condition, results of operations or cash flows.

Accounting_Policies_Other_Oper

Accounting Policies Other Operating Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Other Operating Income and Expense [Table Text Block]	Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1
PLUM CREEK TIMBERLANDS L P [Member]
Other Operating Income and Expense [Table Text Block]	Other Operating Income (Expense), net consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Realized Gains from Grantor Trust Investments	$	2		$	1		$	1
	Gain on Insurance Settlements	13			1			—
	MDF Fire Impairment Loss	(2		)	—			—
	Loss on Early Termination of an Equipment Lease	—			(5		)	—
	Other	2			1			—
	Total Other Operating Income (Expense), net	$	15		$	(2	)	$	1

Business_Acquisition_Tables

Business Acquisition (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Business Acquisition [Line Items]
Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the assets acquired as of the acquisition date at fair value (in millions):
	Assets Acquired:	Fair Value
	Timber and Logging Roads	$	517
	Timberlands	352
	Minerals and Mineral Rights	57
	Property, Plant and Equipment	1
	Equity Method Investments	139
	Intangible Assets	15
	Deferred Tax Assets	4
	Total Assets Acquired	$	1,085
Intangible Assets Acquired [Table Text Block]	The following table summarizes the purchased intangible assets subject to amortization (in millions):
	Description		Fair Value		Amortization Period (in years) (B)
	Acquired Wind Leases		$	10	20
	Acquired Land Leases(A)		7		10
	Fiber Supply Agreement		5		10
	Total Intangible Assets Acquired		$	22
	(A)	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.
	(B)	The amortization method for the purchased intangible assets approximates straight-line.
Actual Impact of Acquisition [Table Text Block]	The amount of revenue and net income included in the company's Consolidated Statements of Income from the Acquisition Date to December 31, 2013 are as follows (in millions):
	Revenue	$	3
	Net Income	$	—
Pro Forma Information [Table Text Block]
			2013		2012
	Pro Forma Revenue		$	1,491	$	1,513
	Pro Forma Net Income		$	253	$	238
PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition [Line Items]
Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the assets acquired as of the acquisition date at fair value (in millions):
	Assets Acquired:	Fair Value
	Timber and Logging Roads	$	517
	Timberlands	352
	Minerals and Mineral Rights	57
	Property, Plant and Equipment	1
	Equity Method Investments	139
	Intangible Assets	15
	Deferred Tax Assets	4
	Total Assets Acquired	$	1,085
Intangible Assets Acquired [Table Text Block]	The following table summarizes the purchased intangible assets subject to amortization (in millions):
	Description		Fair Value		Amortization Period (in years) (B)
	Acquired Wind Leases		$	10	20
	Acquired Land Leases(A)		7		10
	Fiber Supply Agreement		5		10
	Total Intangible Assets Acquired		$	22
	(A)	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.
	(B)	The amortization method for the purchased intangible assets approximates straight-line.
Actual Impact of Acquisition [Table Text Block]	The amount of revenue and net income included in the Operating Partnership's Consolidated Statements of Income from the Acquisition Date to December 31, 2013 are as follows (in millions):
	Revenue	$	3
	Net Income	$	—
Pro Forma Information [Table Text Block]
			2013		2012
	Pro Forma Revenue		$	1,491	$	1,513
	Pro Forma Net Income		$	253	$	238

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the reconciliation of basic and diluted earnings per share for the years ended December 31 (in millions, except per share amounts):
		2014			2013		2012
	Net Income Available to Common Stockholders	$	214		$	214	$	203
	Denominator for Basic Earnings per Share	176.7			164.6		161.5
	Effect of Dilutive Securities – Stock Options	0.2			0.3		0.3
	Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan	0.1			0.1		0.1
	Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities	177			165		161.9
	Per Share Amounts:
	Net Income per Share - Basic	$	1.21		$	1.3	$	1.25
	Net Income per Share - Diluted	$	1.21		$	1.3	$	1.25
Antidilutive Options	Antidilutive options were excluded for certain periods from the computation of diluted earnings per share because the exercise prices of the options were greater than the average market price of the common shares. Antidilutive options were as follows for the years ended December 31 (shares in millions):
		2014		2013	2012
	Number of Options	0.1		—	0.9
	Range of Exercise Prices	$42.98 to $43.23		N/A	$41.55 to $43.23
	Expiration on or before	Feb-18		N/A	Feb-21

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Inventory, Current [Table Text Block]	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Raw Materials (primarily logs)	$	12	$	9
	Work-In-Process	3		2
	Finished Goods	31		30
		46		41
	Supplies	15		14
	Total	$	61	$	55
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Inventory, Current [Table Text Block]	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Raw Materials (primarily logs)	$	12	$	9
	Work-In-Process	3		2
	Finished Goods	31		30
		46		41
	Supplies	15		14
	Total	$	61	$	55

Timber_and_Timberlands_Tables

Timber and Timberlands (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands Tables	Timber and Timberlands consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Timber and Logging Roads, net	$	2,518		$	2,630
	Timber Deeds, net	83			95
	Timberlands	1,408			1,455
	Timber and Timberlands, net	$	4,009		$	4,180
Impairment Losses Table	Impairment losses recorded for the potential sale of timberlands and the associated book basis after the impairment recognition were as follows for the years ended December 31 (in millions):
		2014 (A)			2013			2012
	Impairment Losses	$	7		$	4		$	—
	Book Basis of Property	$	46		$	37		$	4
	(A)    During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000
	acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands Tables	Timber and Timberlands consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Timber and Logging Roads, net	$	2,518		$	2,630
	Timber Deeds, net	83			95
	Timberlands	1,408			1,455
	Timber and Timberlands, net	$	4,009		$	4,180
Impairment Losses Table	Impairment losses recorded for the potential sale of timberlands and the associated book basis after the impairment recognition were as follows for the years ended December 31 (in millions):
			2014 (A)			2013			2012
	Impairment Losses		$	7		$	4		$	—
	Book Basis of Property		$	46		$	37		$	4
	(A)    During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000
	acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.

Minerals_and_Mineral_Rights_Ta

Minerals and Mineral Rights (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Schedule of Minerals and Mineral Rights [Table Text Block]	Minerals and Mineral Rights consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Minerals, net	$	55		$	60
	Mineral Rights, net	$	234		$	238
	Minerals and Mineral Rights, net	$	289		$	298
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the company acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the company acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the company adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—		$	10
	Fiber Supply Agreement	5			—			5		5		—			5
	Total	$	15		$	(1	)	$	14	$	15	$	—		$	15
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
	The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Schedule of Minerals and Mineral Rights [Table Text Block]	Minerals and Mineral Rights consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Minerals, net	$	55		$	60
	Mineral Rights, net	$	234		$	238
	Minerals and Mineral Rights, net	$	289		$	298
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the Operating Partnership acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the Operating Partnership acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the Operating Partnership adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—		$	10
	Fiber Supply Agreement	5			—			5		5		—			5
	Total	$	15		$	(1	)	$	14	$	15	$	—		$	15
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14
Total Mineral Rights and Surface Leases [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
Total Mineral Rights and Surface Leases [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the company acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the company acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the company adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—		$	10
	Fiber Supply Agreement	5			—			5		5		—			5
	Total	$	15		$	(1	)	$	14	$	15	$	—		$	15
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
	The following summarizes the estimated future depletion and amortization expense related to acquired intangibles held at December 31, 2014 (in millions):
	Year		Depletion and Amortization Expense
	2015		$	7
	2016		7
	2017		7
	2018		7
	2019		7
	Thereafter		199
	Total		$	234
	The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Mineral Rights. Acquired Mineral Rights and surface lease intangibles, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Mineral Rights - South Carolina(A)	$	76		$	(2	)	$	74	$	76	$	—		$	76
	Mineral Rights - Georgia(B)	156			(5		)	151		156		(1		)	155
	Surface Leases(C)	10			(1		)	9		7		—			7
	Total Mineral Rights	$	242		$	(8	)	$	234	$	239	$	(1	)	$	238
	(A)	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
	(B)	In September 2013, the Operating Partnership acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
	(C)	In connection with the timberland acquisition from MeadWestvaco Corporation on December 6, 2013, the Operating Partnership acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.
	During 2014, upon finalization of the valuation, the Operating Partnership adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
	Intangible Assets, all of which are finite-lived, consisted of the following (in millions):
		2014								2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Wind Power Leases	$	10		$	(1	)	$	9	$	10	$	—		$	10
	Fiber Supply Agreement	5			—			5		5		—			5
	Total	$	15		$	(1	)	$	14	$	15	$	—		$	15
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following summarizes the estimated future amortization expense related to intangible assets held at December 31, 2014 (in millions):
	Year		Amortization Expense
	2015		$	1
	2016		1
	2017		1
	2018		1
	2019		1
	Thereafter		9
	Total		$	14

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Property, Plant and Equipment	Property, Plant and Equipment consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Land, Buildings and Improvements	$	97		$	91
	Machinery and Equipment	331			323
		428			414
	Accumulated Depreciation	(308		)	(296		)
	Property, Plant and Equipment, net	$	120		$	118
PLUM CREEK TIMBERLANDS L P [Member]
Property, Plant and Equipment	Property, Plant and Equipment consisted of the following (in millions):
		December 31, 2014			December 31, 2013
	Land, Buildings and Improvements	$	97		$	91
	Machinery and Equipment	331			323
		428			414
	Accumulated Depreciation	(308		)	(296		)
	Property, Plant and Equipment, net	$	120		$	118

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The provision (benefit) for income taxes consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Current Income Taxes:
	Federal	$	3		$	—		$	—
	State	1			—			—
	Deferred Income Taxes:
	Federal	4			(1		)	(3		)
	State	(2		)	—			—
	Benefit from Operating Loss Carryforward	—			(1		)	(1		)
	Change to Valuation Allowance	2			1			1
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The provision (benefit) for income taxes is reconciled as follows to the federal statutory rate for the years ended December 31 (in millions):
		2014			2013			2012
	Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	$	78		$	75		$	70
	REIT Income not Subject to Federal Tax	(58		)	(69		)	(66		)
	Change to Valuation Allowance	2			1			1
	State Income Tax Expense (Benefit), net of Federal Benefit	(1		)	(1		)	(1		)
	Permanent Book-Tax Differences	(13		)	(7		)	(7		)
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
Allocation of Income Tax Benefit	Total income tax provision (benefit) was allocated as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	Other Comprehensive Income	(7		)	7			1
	Additional Paid-In Capital (Share-Based Compensation)	—			(1		)	—
	Total Income Tax Provision (Benefit)	$	1		$	5		$	(2	)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The components of deferred income tax assets and liabilities are as follows at December 31 (in millions):
		2014			2013
	Deferred Income Tax Assets:
	Net Operating Loss Carryforwards	$	12		$	13
	Accrued Compensation	8			9
	Accrued Pension Benefits	16			9
	Timber and Timberlands	15			13
	Accrued Workers' Compensation Benefits	3			4
	Other Accruals and Reserves	6			7
	Valuation Allowance	(12		)	(10		)
		48			45
	Deferred Income Tax Liabilities:
	Machinery and Equipment	(19		)	(19		)
		(19		)	(19		)
	Deferred Income Tax Asset, net	$	29		$	26
Deferred Income Tax Asset (Liability) Classification	The net deferred income tax asset is classified on our Consolidated Balance Sheets as follows at December 31 (in millions):
		2014			2013
	Current Deferred Income Tax Asset	$	6		$	9
	Non Current Deferred Income Tax Asset	23			17
	Deferred Income Tax Asset, net	$	29		$	26
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The provision (benefit) for income taxes consists of the following for the years ended December 31 (in millions):
		2014			2013			2012
	Current Income Taxes:
	Federal	$	3		$	—		$	—
	State	1			—			—
	Deferred Income Taxes:
	Federal	4			(1		)	(3		)
	State	(2		)	—			—
	Benefit from Operating Loss Carryforward	—			(1		)	(1		)
	Change to Valuation Allowance	2			1			1
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The provision (benefit) for income taxes is reconciled as follows to the federal statutory rate for the years ended December 31 (in millions):
		2014			2013			2012
	Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	$	78		$	75		$	70
	REIT Income not Subject to Federal Tax	(58		)	(69		)	(66		)
	Change to Valuation Allowance	2			1			1
	State Income Tax Expense (Benefit), net of Federal Benefit	(1		)	(1		)	(1		)
	Permanent Book-Tax Differences	(13		)	(7		)	(7		)
	Provision (Benefit) for Income Taxes on Income from Continuing Operations	$	8		$	(1	)	$	(3	)
Allocation of Income Tax Benefit	Total income tax provision (benefit) was allocated as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Income from Continuing Operations	$	8		$	(1	)	$	(3	)
	Other Comprehensive Income	(7		)	7			1
	Additional Paid-In Capital (Share-Based Compensation)	—			(1		)	—
	Total Income Tax Provision (Benefit)	$	1		$	5		$	(2	)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The components of deferred income tax assets and liabilities are as follows at December 31 (in millions):
		2014			2013
	Deferred Income Tax Assets:
	Net Operating Loss Carryforwards	$	12		$	13
	Accrued Compensation	8			9
	Accrued Pension Benefits	16			9
	Timber and Timberlands	15			13
	Accrued Workers' Compensation Benefits	3			4
	Other Accruals and Reserves	6			7
	Valuation Allowance	(12		)	(10		)
		48			45
	Deferred Income Tax Liabilities:
	Machinery and Equipment	(19		)	(19		)
		(19		)	(19		)
	Deferred Income Tax Asset, net	$	29		$	26
Deferred Income Tax Asset (Liability) Classification	The net deferred income tax asset is classified on our Consolidated Balance Sheets as follows at December 31 (in millions):
		2014			2013
	Current Deferred Income Tax Asset	$	6		$	9
	Non Current Deferred Income Tax Asset	23			17
	Deferred Income Tax Asset, net	$	29		$	26

REIT_Disclosures_Tables

REIT Disclosures (Tables) (PLUM CREEK TIMBER CO INC [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Historical Tax Character of Distributions to Shareholders	The table below summarizes the historical tax character of distributions to Plum Creek shareholders for the years ended December 31 (amounts per share):
		2014		2013		2012
	Capital Gain Dividend	$	1.76	$	1.74	$	1.68
	Non-Taxable Return of Capital	—		—		—
	Total Distributions	$	1.76	$	1.74	$	1.68

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Debt [Table Text Block]	Outstanding borrowings consist of the following (in millions):
		December 31, 2014		December 31, 2013
	Line of Credit maturing 2019, 1.34% at 12/31/14, based on LIBOR plus 1.25%	$	95	$	467
	Term Credit Agreement due 2019, 1.67% at 12/31/14, based on LIBOR plus 1.50%.	225		225
	Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11%	439		438
	Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71%	568		568
	Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34%	323		323
	Installment Note Payable due 2023, 5.207%	860		860
	Note Payable to Timberland Venture due 2018, 7.375%	783		783
	Total Long-Term Debt	3,293		3,664
	Less: Current Portion of Long-Term Debt	439		—
	Less: Line of Credit	95		467
	Long-Term Portion	$	2,759	$	3,197
Schedule of Debt Principal Payments [Table Text Block]	Debt Principal Payments. The table below summarizes the debt principal payments made for the years ended December 31 (in millions):
		2014		2013
	Public Debt	$	—	$	24
	Private Debt	—		260
	Term Credit Agreement	—		225
	Total	$	—	$	509
Schedule of Maturities of Long-term Debt [Table Text Block]	Debt Maturities. The aggregate maturities on all debt agreements are as follows as of December 31, 2014 (in millions):
	Maturity	Debt		Note		Total
		Agreements		Payable to
				Timberland
				Venture
	2015	$	439	$	—	$	439
	2016	—		—		—
	2017	—		—		—
	2018	—		783		783
	2019	320		—		320
	Thereafter	1,754		—		1,754
	Total	$	2,513	$	783	$	3,296
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Debt [Table Text Block]	Outstanding borrowings of the Operating Partnership, all of which are unsecured, consist of the following (in millions):
		December 31, 2014		December 31, 2013
	Line of Credit maturing 2019, 1.34% at 12/31/14, based on LIBOR plus 1.25%	$	95	$	467
	Term Credit Agreement due 2019, 1.67% at 12/31/14, based on LIBOR plus 1.50%.	225		225
	Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11%	439		438
	Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71%	568		568
	Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34%	323		323
	Installment Note Payable due 2023, 5.207%	860		860
	Total Long-Term Debt	2,510		2,881
	Less: Current Portion of Long-Term Debt	439		—
	Less: Line of Credit	95		467
	Long-Term Portion	$	1,976	$	2,414
Schedule of Debt Principal Payments [Table Text Block]	Debt Principal Payments. The table below summarizes the debt principal payments made for the years ended December 31 (in millions):
		2014		2013
	Public Debt	$	—	$	24
	Private Debt	—		260
	Term Credit Agreement	—		225
	Total	$	—	$	509
Schedule of Maturities of Long-term Debt [Table Text Block]	Debt Maturities. The aggregate maturities on all debt agreements are as follows as of December 31, 2014 (in millions):
	Maturity	Debt Agreements
	2015	$	439
	2016	—
	2017	—
	2018	—
	2019	320
	Thereafter	1,754
	Total	$	2,513

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Level 1 Assets Reported in the Company's Financial Statements at Fair Value, Measured on a Recurring Basis	Assets and Liabilities Measured at Fair Value on a Recurring Basis. The company’s fair value measurements of its cash equivalents, available-for-sale securities, and trading securities, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the company’s financial statements at fair value, measured on a recurring basis (in millions):
		Balance at			Fair Value Measurements
		31-Dec-14			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	90		$	90
	Available-for-Sale Securities (B)	43			43
	Trading Securities (B)	5			5
	Total	$	138		$	138
		Balance at			Fair Value Measurements
		31-Dec-13			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	428		$	428
	Available-for-Sale Securities (B)	40			40
	Trading Securities (B)	5			5
	Total	$	473		$	473
	(A)	Consists of several money market funds and is included in the $92 million and $433 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013, respectively.
	(B)	Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013. At December 31, 2014, investments in these mutual funds were approximately 45% in domestic (U.S.) equities, 25% in international equities and 30% in debt securities.
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	Other Instruments. Summarized below are the carrying amount and fair value of the company's debt (estimated using the discounted cash flow method) along with the categorization under the fair value hierarchy in the Accounting Standards Codification (in millions):
						Fair Value at December 31, 2014
			Carrying Amount at December 31, 2014			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,330		$	—	$	1,398	$	—	$	1,398
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		95			—		95		—		95
	Installment Note Payable (D)		860			—		906		—		906
	Note Payable to Timberland Venture (E)		783			—		—		892		892
	Total Debt		$	3,293		$	—	$	2,624	$	892	$	3,516
						Fair Value at December 31, 2013
			Carrying Amount at December 31, 2013			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,329		$	—	$	1,361	$	—	$	1,361
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		467			—		467		—		467
	Installment Note Payable (D)		860			—		845		—		845
	Note Payable to Timberland Venture (E)		783			—		—		916		916
	Total Debt		$	3,664		$	—	$	2,898	$	916	$	3,814
	(A)	Fair value of the company's Public Debt (publicly issued Senior Notes) is estimated using multiple market quotes for the company's public bonds.
	(B)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable debt.
	(C)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable credit lines.
	(D)	Fair value is estimated by adjusting the spread over the applicable Treasury rate to a current market quote for comparable debt.
	(E)	Fair value is estimated by using market quotes for the company's Public Debt adjusted by an estimated risk premium for holding company debt and the different maturity.
Fair Value Measurements, Nonrecurring [Table Text Block]	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. The company’s fair value measurements of its assets and liabilities, measured on a nonrecurring basis, are categorized as Level 3 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 3 valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Summarized below are the Level 3 assets reported in the company's financial statements at fair value, measured on a nonrecurring basis, during the years ended December 31 (in millions):
		2014		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (A)	$46		$46	($7)
	Total				($7)
		2013		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (B)	$37		$37	($4)
	Total				($4)
	(A)	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
	(B)	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
PLUM CREEK TIMBERLANDS L P [Member]
Level 1 Assets Reported in the Company's Financial Statements at Fair Value, Measured on a Recurring Basis	Assets and Liabilities Measured at Fair Value on a Recurring Basis. The Operating Partnership’s fair value measurements of its cash equivalents, available-for-sale securities, and trading securities, measured on a recurring basis, are categorized as Level 1 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 1 valuation is based on quoted prices in active markets at the measurement date for identical unrestricted assets or liabilities. Summarized below are the Level 1 assets reported in the Operating Partnership’s financial statements at fair value, measured on a recurring basis (in millions):
		Balance at			Fair Value Measurements
		31-Dec-14			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	90		$	90
	Available-for-Sale Securities (B)	43			43
	Trading Securities (B)	5			5
	Total	$	138		$	138
		Balance at			Fair Value Measurements
		31-Dec-13			at Reporting Date Using
					Quoted Prices in Active
					Markets of Identical Assets
					(Level 1 Measurements)
	Cash Equivalents (A)	$	428		$	428
	Available-for-Sale Securities (B)	40			40
	Trading Securities (B)	5			5
	Total	$	473		$	473
	(A)	Consists of several money market funds and is included in the $92 million and $433 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013, respectively.
	(B)	Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at December 31, 2014 and December 31, 2013. At December 31, 2014, investments in these mutual funds were approximately 45% in domestic (U.S.) equities, 25% in international equities and 30% in debt securities.
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	Other Instruments. Summarized below are the carrying amount and fair value of the Operating Partnership's debt (estimated using the discounted cash flow method) along with the categorization under the fair value hierarchy in the Accounting Standards Codification (in millions):
						Fair Value at December 31, 2014
			Carrying Amount at December 31, 2014			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,330		$	—	$	1,398	$	—	$	1,398
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		95			—		95		—		95
	Installment Note Payable (D)		860			—		906		—		906
	Total Debt		$	2,510		$	—	$	2,624	$	—	$	2,624
						Fair Value at December 31, 2013
			Carrying Amount at December 31, 2013			Quoted Prices		Significant		Significant		Total
						In Active		Observable		Unobservable
						Markets for		Inputs		Inputs
						Identical Assets		(Level 2)		(Level 3)
						(Level 1)
	Public Debt (A)		$	1,329		$	—	$	1,361	$	—	$	1,361
	Term Credit Agreement (B)		225			—		225		—		225
	Line of Credit (C)		467			—		467		—		467
	Installment Note Payable (D)		860			—		845		—		845
	Total Debt		$	2,881		$	—	$	2,898	$	—	$	2,898
	(A)	Fair value of the Operating Partnership's Public Debt (publicly issued Senior Notes) is estimated using multiple market quotes for the Operating Partnership's public bonds.
	(B)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable debt.
	(C)	Fair value is estimated by adjusting the spread over LIBOR to a current market quote for comparable credit lines.
	(D)	Fair value is estimated by adjusting the spread over the applicable Treasury rate to a current market quote for comparable debt.
Fair Value Measurements, Nonrecurring [Table Text Block]	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis. The Operating Partnership’s fair value measurements of its assets and liabilities, measured on a nonrecurring basis, are categorized as Level 3 measurements under the fair value hierarchy in the Accounting Standards Codification. A Level 3 valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Summarized below are the Level 3 assets reported in the Operating Partnership's financial statements at fair value, measured on a nonrecurring basis, during the years ended December 31 (in millions):
		2014		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (A)	$46		$46	($7)
	Total				($7)
		2013		Fair Value Measurements	Net Gain (Loss)
				Using Significant
				Unobservable Inputs
				(Level 3 Measurements)
	Timberlands Held for Sale (B)	$37		$37	($4)
	Total				($4)
	(A)	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
	(B)	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.

Stockholders_Equity_Tables

Stockholders' Equity (Tables) (PLUM CREEK TIMBER CO INC [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Share Repurchase Program Disclosure [Table Text Block]	The table below summarizes the share repurchases pursuant to this program for the year ended December 31:
			2014
	Shares of Common Stock (in millions)		1.2
	Total Cost of Shares (in millions)		$	50
	Average Cost per Share		$	40.21
Schedule of Comprehensive Income (Loss) [Table Text Block]	Comprehensive income was as follows for the years ended December 31 (in millions):
			Pretax			Tax Expense			After-Tax
			Amount			(Benefit)			Amount
	December 31, 2012
	Net Income								$	203
	Unrealized Holding Gains (Losses)		$	2		$	—		2
	Defined Benefit Plans:
	Actuarial Gain (Loss)		(2		)	—			(2		)
	Reclassification to Net Income		4			1			3
	Total Comprehensive Income								$	206
	December 31, 2013
	Net Income								$	214
	Unrealized Holding Gains (Losses)		$	5		$	—		5
	Defined Benefit Plans:
	Actuarial Gain (Loss)		25			6			19
	Reclassification to Net Income		5			1			4
	Derivative Gain (Loss) on Cash Flow Hedge		5			—			5
	Total Comprehensive Income								$	247
	December 31, 2014
	Net Income								$	214
	Unrealized Holding Gains (Losses)		$	1		$	—		1
	Defined Benefit Plans:
	Actuarial Gain (Loss)		(34		)	(7		)	(27		)
	Reclassification to Net Income		2			—			2
	Derivative Instruments:
	Amortization of Gain Reclassified to Interest Expense		—			—			—
	Total Comprehensive Income								$	190
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The components of accumulated other comprehensive income, net of tax, were as follows at December 31 (in millions):
			Net Unrealized Holding Gain (Loss)			Defined Benefit Plan Actuarial Net Loss			Gain on Cash Flow Hedge			Total
	31-Dec-12		$	8		$	(40	)	$	—		$	(32	)
	Other Comprehensive Income (Loss) before Reclassifications		5			19			5			29
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)		—			4			—			4
	31-Dec-13		$	13		$	(17	)	$	5		$	1
	Other Comprehensive Income (Loss) before Reclassifications		1			(27		)	—			(26		)
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)		—			2			—			2
	31-Dec-14		$	14		$	(42	)	$	5		$	(23	)
	(A)	Amortization of actuarial gains and losses on the company's defined benefit pension plans is included in the computation of pension cost. See Note 14 of the Notes to Consolidated Financial Statements.

Partners_Capital_Tables

Partners' Capital (Tables) (PLUM CREEK TIMBERLANDS L P [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Comprehensive Income (Loss) [Table Text Block]	Comprehensive income was as follows for the years ended December 31 (in millions):
		Pretax			Tax Expense			After-Tax
		Amount			(Benefit)			Amount
	December 31, 2012
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	261
	Unrealized Holding Gains (Losses)	$	2		$	—		2
	Defined Benefit Plans:
	Actuarial Gain (Loss)	(2		)	—			(2		)
	Reclassification to Net Income	4			1			3
	Total Comprehensive Income							$	264
	December 31, 2013
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	272
	Unrealized Holding Gains (Losses)	$	5		$	—		5
	Defined Benefit Plans:
	Actuarial Gain (Loss)	25			6			19
	Reclassification to Net Income	5			1			4
	Derivative Gain (Loss) on Cash Flow Hedge	5			—			5
	Total Comprehensive Income							$	305
	December 31, 2014
	Net Income before Allocation to Series T-1 Preferred Interest and Partners							$	272
	Unrealized Holding Gains (Losses)	$	1		$	—		1
	Defined Benefit Plans:
	Actuarial Gain (Loss)	(34		)	(7		)	(27		)
	Reclassification to Net Income	2			—			2
	Derivative Instruments:
	Amortization of Gain Reclassified to Interest Expense	—			—			—
	Total Comprehensive Income							$	248
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The components of accumulated other comprehensive income, net of tax, were as follows at December 31 (in millions):
		Net Unrealized Holding Gain (Loss)			Defined Benefit Plan Actuarial Net Loss			Gain on Cash Flow Hedge			Total
	31-Dec-12	$	8		$	(40	)	$	—		$	(32	)
	Other Comprehensive Income (Loss) before Reclassifications	5			19			5			29
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)	—			4			—			4
	31-Dec-13	$	13		$	(17	)	$	5		$	1
	Other Comprehensive Income (Loss) before Reclassifications	1			(27		)	—			(26		)
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (A)	—			2			—			2
	31-Dec-14	$	14		$	(42	)	$	5		$	(23	)
	(A)    Amortization of actuarial gains and losses on the Operating Partnership’s defined benefit pension plans is
	included in the computation of pension cost. See Note 12 of the Notes to Consolidated Financial Statements.

Employee_Pension_and_Retiremen1

Employee Pension and Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Net Funded Status [Table Text Block]	The following table provides a reconciliation of benefit obligations, plan assets, and funded status of the plans for the years ended December 31 (in millions):
			2014				2013
	Change in Benefit Obligation
	Benefit Obligation at Beginning of Period		$	178			$	181
	Service Cost		7				7
	Interest Cost		8				8
	Actuarial (Gain) Loss		32				(12		)
	Benefits Paid		(7		)		(6		)
	Benefit Obligation at End of Period		$	218			$	178
	Change in Plan Assets
	Fair Value of Plan Assets at Beginning of Period		$	144			$	128
	Actual Return on Plan Assets		7				22
	Employer Contributions		10				—
	Benefits Paid		(7		)		(6		)
	Fair Value of Plan Assets at End of Period		154				144
	Funded Status—December 31		$	(64	)		$	(34	)
	Amounts Recognized in the Consolidated Balance Sheet
	Other Assets		$	—			$	10
	Other Current Liabilities		(5		)		(5		)
	Other Liabilities		(59		)		(39		)
	Total		$	(64	)		$	(34	)
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]	The following table sets forth the benefit obligation, accumulated benefit obligation, plan assets, and assets held in the grantor trust for the qualified and non-qualified pension plans as of December 31 (in millions):
			Qualified Pension Plan								Non-Qualified Pension Plans
			2014				2013				2014			2013
	Projected Benefit Obligation		$	164			$	134			$	54		$	44
	Accumulated Benefit Obligation		154				126				45			36
	Plan Assets		154				144				N/A			N/A
	Assets Held in the Grantor Trust		N/A				N/A				43			40
Schedule of Net Benefit Costs [Table Text Block]	The components of pension cost recognized in net income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Service Cost		$	7			$	7			$	6
	Interest Cost		8				8				8
	Expected Return on Plan Assets		(9		)		(9		)		(7		)
	Recognized Actuarial Loss		2				5				4
	Total Pension Cost		$	8			$	11			$	11
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	The components of pension cost recognized in comprehensive income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Net Actuarial Loss (Gain)		$	34			$	(25	)		$	2
	Amortization of Net Actuarial Loss		(2		)		(5		)		(4		)
	Total (Gain) Loss Recognized in Other Comprehensive Income		$	32			$	(30	)		$	(2	)
	Combined Pension Cost Recognized in Comprehensive Income		$	40			$	(19	)		$	9
Amounts Included in Accumulated Other Comprehensive Income	Amounts included in accumulated other comprehensive income are as follows as of December 31 (in millions):
			2014				2013
	Net Loss		$	54			$	22
	Deferred Tax Benefit		$	(13	)		$	(6	)
Schedule of Assumptions Used [Table Text Block]	Weighted-average assumptions used to determine benefit obligation are as follows:
			December 31, 2014			December 31, 2013
	Discount Rates
	Annuity Distributions		4.15	%		5.05	%
	Lump-Sum Distributions		3.04	%		3.8	%
	Rate of Compensation Increase		3.45	%		3.45	%
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
			2014			2013			2012
	Discount Rate		5.05	%		4.35	%		4.95	%
	Expected Long-Term Return on Plan Assets		7.25	%		7.25	%		7.5	%
	Rate of Compensation Increase		3.45	%		3.45	%		3.45	%
Schedule of Allocation of Plan Assets [Table Text Block]	At December 31, 2014, target allocations for the various asset classes are as follows:
	Large Capitalization Domestic Equities	32		%
	Small and Mid-Size Capitalization Domestic Equities	7		%
	International Equities	26		%
	Fixed Income	35		%
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The fair values of each major class of plan assets were as follows as of December 31, 2014 (in millions):
			Quoted Prices				Significant				Total
			In Active				Observable
			Markets for				Inputs
			Identical Assets				(Level 2)
			(Level 1)
	Money Market Funds		$	1			$	—			$	1
	Mutual Funds invested in:
	Large Cap. Domestic Equity Securities		16				—				16
	Small and Mid. Cap. Domestic Equity Securities		11				—				11
	International Equity Securities		40				—				40
	Fixed Income Securities		8				—				8
	Collective Trust Funds invested in:
	Large Cap. Domestic Equity Securities		—				34				34
	Fixed Income Securities		—				8				8
	Limited Partnership Interest invested in:
	Fixed Income Securities		—				36				36
	Total Investments Measured at Fair Value		$	76			$	78			$	154
	The fair values of each major class of plan assets were as follows as of December 31, 2013 (in millions):
			Quoted Prices				Significant				Total
			In Active				Observable
			Markets for				Inputs
			Identical Assets				(Level 2)
			(Level 1)
	Money Market Funds		$	—			$	—			$	—
	Mutual Funds invested in:
	Large Cap. Domestic Equity Securities		16				—				16
	Small and Mid. Cap. Domestic Equity Securities		11				—				11
	International Equity Securities		38				—				38
	Fixed Income Securities		40				—				40
	Collective Trust Funds invested in:
	Large Cap. Domestic Equity Securities		—				32				32
	Fixed Income Securities		—				7				7
	Total Investments Measured at Fair Value		$	105			$	39			$	144
Schedule of Expected Benefit Payments [Table Text Block]	The following table presents expected future benefit payments projected based on the same assumptions used by the company to measure the benefit obligation and estimate future employee service (in millions):
	Year		Projected Benefit
			Payments
	2015		$	17
	2016		18
	2017		27
	2018		15
	2019		16
	2020 through 2024		78
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Net Funded Status [Table Text Block]	The following table provides a reconciliation of benefit obligations, plan assets, and funded status of the plans for the years ended December 31 (in millions):
			2014				2013
	Change in Benefit Obligation
	Benefit Obligation at Beginning of Period		$	178			$	181
	Service Cost		7				7
	Interest Cost		8				8
	Actuarial (Gain) Loss		32				(12		)
	Benefits Paid		(7		)		(6		)
	Benefit Obligation at End of Period		$	218			$	178
	Change in Plan Assets
	Fair Value of Plan Assets at Beginning of Period		$	144			$	128
	Actual Return on Plan Assets		7				22
	Employer Contributions		10				—
	Benefits Paid		(7		)		(6		)
	Fair Value of Plan Assets at End of Period		154				144
	Funded Status—December 31		$	(64	)		$	(34	)
	Amounts Recognized in the Consolidated Balance Sheet
	Other Assets		$	—			$	10
	Other Current Liabilities		(5		)		(5		)
	Other Liabilities		(59		)		(39		)
	Total		$	(64	)		$	(34	)
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]	The following table sets forth the benefit obligation, accumulated benefit obligation, plan assets, and assets held in the grantor trust for the qualified and non-qualified pension plans as of December 31 (in millions):
			Qualified Pension Plan								Non-Qualified Pension Plans
			2014				2013				2014			2013
	Projected Benefit Obligation		$	164			$	134			$	54		$	44
	Accumulated Benefit Obligation		154				126				45			36
	Plan Assets		154				144				N/A			N/A
	Assets Held in the Grantor Trust		N/A				N/A				43			40
Schedule of Net Benefit Costs [Table Text Block]	The components of pension cost recognized in net income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Service Cost		$	7			$	7			$	6
	Interest Cost		8				8				8
	Expected Return on Plan Assets		(9		)		(9		)		(7		)
	Recognized Actuarial Loss		2				5				4
	Total Pension Cost		$	8			$	11			$	11
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	The components of pension cost recognized in comprehensive income are as follows for the years ended December 31 (in millions):
			2014				2013				2012
	Net Actuarial Loss (Gain)		$	34			$	(25	)		$	2
	Amortization of Net Actuarial Loss		(2		)		(5		)		(4		)
	Total (Gain) Loss Recognized in Other Comprehensive Income		$	32			$	(30	)		$	(2	)
	Combined Pension Cost Recognized in Comprehensive Income		$	40			$	(19	)		$	9
Amounts Included in Accumulated Other Comprehensive Income	Amounts included in accumulated other comprehensive income are as follows as of December 31 (in millions):
			2014				2013
	Net Loss		$	54			$	22
	Deferred Tax Benefit		$	(13	)		$	(6	)
Schedule of Assumptions Used [Table Text Block]	Weighted-average assumptions used to determine benefit obligation are as follows:
			December 31, 2014			December 31, 2013
	Discount Rates
	Annuity Distributions		4.15	%		5.05	%
	Lump-Sum Distributions		3.04	%		3.8	%
	Rate of Compensation Increase		3.45	%		3.45	%
	Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31:
			2014			2013			2012
	Discount Rate		5.05	%		4.35	%		4.95	%
	Expected Long-Term Return on Plan Assets		7.25	%		7.25	%		7.5	%
	Rate of Compensation Increase		3.45	%		3.45	%		3.45	%
Schedule of Allocation of Plan Assets [Table Text Block]	At December 31, 2014, target allocations for the various asset classes are as follows:
	Large Capitalization Domestic Equities	32		%
	Small and Mid-Size Capitalization Domestic Equities	7		%
	International Equities	26		%
	Fixed Income	35		%
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The fair values of each major class of plan assets were as follows as of December 31, 2014 (in millions):
			Quoted Prices				Significant				Total
			In Active				Observable
			Markets for				Inputs
			Identical Assets				(Level 2)
			(Level 1)
	Money Market Funds		$	1			$	—			$	1
	Mutual Funds invested in:
	Large Cap. Domestic Equity Securities		16				—				16
	Small and Mid. Cap. Domestic Equity Securities		11				—				11
	International Equity Securities		40				—				40
	Fixed Income Securities		8				—				8
	Collective Trust Funds invested in:
	Large Cap. Domestic Equity Securities		—				34				34
	Fixed Income Securities		—				8				8
	Limited Partnership Interest invested in:
	Fixed Income Securities		—				36				36
	Total Investments Measured at Fair Value		$	76			$	78			$	154
	The fair values of each major class of plan assets were as follows as of December 31, 2013 (in millions):
			Quoted Prices				Significant				Total
			In Active				Observable
			Markets for				Inputs
			Identical Assets				(Level 2)
			(Level 1)
	Money Market Funds		$	—			$	—			$	—
	Mutual Funds invested in:
	Large Cap. Domestic Equity Securities		16				—				16
	Small and Mid. Cap. Domestic Equity Securities		11				—				11
	International Equity Securities		38				—				38
	Fixed Income Securities		40				—				40
	Collective Trust Funds invested in:
	Large Cap. Domestic Equity Securities		—				32				32
	Fixed Income Securities		—				7				7
	Total Investments Measured at Fair Value		$	105			$	39			$	144
Schedule of Expected Benefit Payments [Table Text Block]	The following table presents expected future benefit payments projected based on the same assumptions used by the Operating Partnership to measure the benefit obligation and estimate future employee service (in millions):
	Year	Projected Benefit
		Payments
	2015	$	17
	2016	18
	2017	27
	2018	15
	2019	16
	2020 through 2024	78

ShareBased_Compensation_Plans_

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	Value management awards activity was as follows for the year ended December 31, 2014:
		Units
	Nonvested, January 1, 2014	256,133
	Granted	145,080
	Vested	(123,080	)
	Forfeited	(6,975	)
	Nonvested, December 31, 2014	271,158
Summary of Outstanding Value Management Awards	Presented below is a summary of outstanding value management awards and related fair values, unrecognized compensation expense and maximum value as of December 31, 2014 (dollars in millions):
	Performance Period		Outstanding		Fair Value (A)			Unrecognized				Maximum Award
			Units					Compensation				Value (B)
								Expense
	2012 to 2014		120,280		$	0.3		$	—			$	24.1
	2013 to 2015		129,203		$	2.5		$	0.8			$	25.8
	2014 to 2016		141,955		$	6.3		$	4			$	28.4
	(A)	The estimated fair value includes unrecognized compensation expense.
	(B)	Maximum award value is based on a unit value of $200.
Summary of Earned and Paid Value Management Awards For Three Year Periods	Presented below is a summary of earned and paid (primarily in cash) value management awards for the following three-year performance periods:
	Performance Period		Payout Value			Total Payout			Payment Date
			per Unit			(millions)
	2012 to 2014		$	3		$	0.3		1st Quarter 2015
	2011 to 2013		$	35		$	2.7		1st Quarter 2014
	2010 to 2012		$	0		$	0		Not Earned
	2009 to 2011		$	0		$	0		Not Earned
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Restricted stock unit activity was as follows for the year ended December 31, 2014:
			Units		Weighted-
					Average
					Grant Date
					Fair Value
	Nonvested, January 1, 2014		366,133		$	43.35
	Granted		228,765		$	42.04
	Vested		(133,236	)	$	41.71
	Forfeited		(48,090	)	$	42.12
	Nonvested, December 31, 2014		413,572		$	43.3
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	Presented below is a summary of Plum Creek’s stock option Plan activity for the year ended December 31, 2014:
			Shares		Weighted-			Weighted-			Aggregate
			Subject to		Average			Average			Intrinsic Value
			Options		Exercise			Remaining			(Millions)
					Price			Contractual
								Life (Years)
	Outstanding, January 1, 2014		1,928,961		$	38.47
	Granted		—		—
	Exercised/Surrendered		(70,425	)	35.54
	Cancelled/Forfeited		(12,238	)	36.36
	Outstanding, December 31, 2014		1,846,298		$	38.59		4			$	8
	Vested or Expected to Vest, December 31, 2014		1,846,298		$	38.59		4			$	8
	Exercisable, December 31, 2014		1,713,696		$	38.37		4			$	8
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]	The table below presents stock activity related to stock options exercised during the years ended December 31 (in millions):
			2014			2013			2012
	Proceeds from Stock Options Exercised		$	3		$	37		$	18
	Intrinsic Value of Stock Options Exercised		$	1		$	12		$	6
	Tax Benefit Related to Stock Options Exercised		$	—		$	2		$	1
Schedule of Share-based Compensation Expense and Recognized Tax Benefits [Table Text Block]	The table below presents total compensation expense and recognized tax benefits for all share-based compensation plans (including both awards paid in stock and cash) for the years ended December 31 (in millions):
			2014			2013			2012
	Share-based Compensation Expense		$	6		$	13		$	13
	Recognized Tax Benefits		$	1		$	2		$	2
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Nonvested Performance-based Units Activity [Table Text Block]	Value management awards activity was as follows for the year ended December 31, 2014:
		Units
	Nonvested, January 1, 2014	256,133
	Granted	145,080
	Vested	(123,080	)
	Forfeited	(6,975	)
	Nonvested, December 31, 2014	271,158
Summary of Outstanding Value Management Awards	Presented below is a summary of outstanding value management awards and related fair values, unrecognized compensation expense and maximum value as of December 31, 2014 (dollars in millions):
	Performance Period		Outstanding		Fair Value (A)			Unrecognized				Maximum Award
			Units					Compensation				Value (B)
								Expense
	2012 to 2014		120,280		$	0.3		$	—			$	24.1
	2013 to 2015		129,203		$	2.5		$	0.8			$	25.8
	2014 to 2016		141,955		$	6.3		$	4			$	28.4
	(A)	The estimated fair value includes unrecognized compensation expense.
	(B)	Maximum award value is based on a unit value of $200.
Summary of Earned and Paid Value Management Awards For Three Year Periods	Presented below is a summary of earned and paid (primarily in cash) value management awards for the following three-year performance periods:
	Performance Period		Payout Value			Total Payout			Payment Date
			per Unit			(millions)
	2012 to 2014		$	3		$	0.3		1st Quarter 2015
	2011 to 2013		$	35		$	2.7		1st Quarter 2014
	2010 to 2012		$	0		$	0		Not Earned
	2009 to 2011		$	0		$	0		Not Earned
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Restricted stock unit activity was as follows for the year ended December 31, 2014:
			Units		Weighted-
					Average
					Grant Date
					Fair Value
	Nonvested, January 1, 2014		366,133		$	43.35
	Granted		228,765		$	42.04
	Vested		(133,236	)	$	41.71
	Forfeited		(48,090	)	$	42.12
	Nonvested, December 31, 2014		413,572		$	43.3
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	Presented below is a summary of Plum Creek’s stock option Plan activity for the year ended December 31, 2014:
			Shares		Weighted-			Weighted-			Aggregate
			Subject to		Average			Average			Intrinsic Value
			Options		Exercise			Remaining			(Millions)
					Price			Contractual
								Life (Years)
	Outstanding, January 1, 2014		1,928,961		$	38.47
	Granted		—		—
	Exercised/Surrendered		(70,425	)	35.54
	Cancelled/Forfeited		(12,238	)	36.36
	Outstanding, December 31, 2014		1,846,298		$	38.59		4			$	8
	Vested or Expected to Vest, December 31, 2014		1,846,298		$	38.59		4			$	8
	Exercisable, December 31, 2014		1,713,696		$	38.37		4			$	8
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]	The table below presents stock activity related to stock options exercised during the years ended December 31 (in millions):
			2014			2013			2012
	Proceeds from Stock Options Exercised		$	3		$	37		$	18
	Intrinsic Value of Stock Options Exercised		$	1		$	12		$	6
	Tax Benefit Related to Stock Options Exercised		$	—		$	2		$	1
Schedule of Share-based Compensation Expense and Recognized Tax Benefits [Table Text Block]	The table below presents total compensation expense and recognized tax benefits for all share-based compensation plans (including both awards paid in stock and cash) for the years ended December 31 (in millions):
			2014			2013			2012
	Share-based Compensation Expense		$	6		$	13		$	13
	Recognized Tax Benefits		$	1		$	2		$	2

Detail_of_Certain_Balance_Shee1

Detail of Certain Balance Sheet Accounts (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Other Assets and Other Liabilities [Table Text Block]	Certain balance sheet accounts consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Other Current Assets
	Prepaid Expenses	$	8	$	7
	Taxes Receivable	4		3
	Notes Receivable	—		3
	Deposits	2		2
	Real Estate Development Properties	1		—
		$	15	$	15
	Other Non-Current Assets
	Real Estate Development Properties	$	12	$	13
	Unamortized Debt Issue Costs	7		8
	Deposits	8		8
	Qualified Pension Asset	—		10
	Intangible Assets	14		15
	Other	4		—
		$	45	$	54
	Other Current Liabilities
	Long-Term Incentive Compensation	$	—	$	3
	Accrued Pension Liability	5		5
	Workers’ Compensation	1		1
	Other	4		1
		$	10	$	10
	Other Non-Current Liabilities
	Timber Obligations	$	5	$	5
	Deferred Compensation	5		5
	Long-Term Incentive Compensation	4		8
	Accrued Pension Liability	59		39
	Deferred Revenue	12		7
	Workers’ Compensation	7		9
	Other	8		5
		$	100	$	78
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Other Assets and Other Liabilities [Table Text Block]	Certain balance sheet accounts consisted of the following (in millions):
		December 31, 2014		December 31, 2013
	Other Current Assets
	Prepaid Expenses	$	8	$	7
	Taxes Receivable	4		3
	Notes Receivable	—		3
	Deposits	2		2
	Real Estate Development Properties	1		—
		$	15	$	15
	Other Non-Current Assets
	Real Estate Development Properties	$	12	$	13
	Unamortized Debt Issue Costs	7		8
	Deposits	8		8
	Qualified Pension Asset	—		10
	Intangible Assets	14		15
	Other	4		—
		$	45	$	54
	Other Current Liabilities
	Long-Term Incentive Compensation	$	—	$	3
	Accrued Pension Liability	5		5
	Workers’ Compensation	1		1
	Other	4		1
		$	10	$	10
	Other Non-Current Liabilities
	Timber Obligations	$	5	$	5
	Deferred Compensation	6		6
	Long-Term Incentive Compensation	4		8
	Accrued Pension Liability	59		39
	Deferred Revenue	12		7
	Workers’ Compensation	7		9
	Other	8		5
		$	101	$	79

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Future Minimum Operating Lease Payments and Obligations	The following summarizes the future minimum operating lease payments and obligations in connection with leasing timberlands at December 31, 2014 (in millions):
		Operating		Timber
		Leases		Obligations
	2015	$	4	$	1
	2016	4		—
	2017	4		—
	2018	4		—
	2019	3		—
	Thereafter	12		4
	Total	$	31	$	5
PLUM CREEK TIMBERLANDS L P [Member]
Future Minimum Operating Lease Payments and Obligations	The following summarizes the future minimum operating lease payments and obligations in connection with leasing timberlands at December 31, 2014 (in millions):
		Operating		Timber
		Leases		Obligations
	2015	$	4	$	1
	2016	4		—
	2017	4		—
	2018	4		—
	2019	3		—
	Thereafter	12		4
	Total	$	31	$	5

Equity_Method_Investment_Table

Equity Method Investment (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings for the Timberland Venture	Equity earnings for the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	54	$	53	$	51
	Common Interest	—		—		—
	Amortization of Basis Difference	9		10		8
	Total Equity Earnings from Timberland Venture	$	63	$	63	$	59
	Distributions from the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	56	$	55	$	56
	Common Interest	1		1		—
	Total Distributions from Timberland Venture	$	57	$	56	$	56
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings for the Timberland Venture	Equity earnings for the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	54	$	53	$	51
	Common Interest	—		—		—
	Amortization of Basis Difference	9		10		8
	Total Equity Earnings from Timberland Venture	$	63	$	63	$	59
	Distributions from the Timberland Venture consist of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Preferred Interest	$	56	$	55	$	56
	Common Interest	1		1		—
	Total Distributions from Timberland Venture	$	57	$	56	$	56

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Equity Earnings and Distributions	Equity earnings and distributions from the Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Equity Earnings	$	63	$	63	$	59
	Distributions	57		56		56
Interest Expense and Payments	Interest expensed and paid with respect to the Note Payable to Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Interest Expense	$	58	$	58	$	58
	Interest Payments	58		58		58
Schedule of Interest Payable to a Related Party [Table Text Block]	As a result, the company had accrued interest payable for the Note Payable to Timberland Venture of the following at December 31 (in millions):
		2014		2013
	Interest Payable (to related party)	$	7	$	7
PLUM CREEK TIMBERLANDS L P [Member]
Equity Earnings and Distributions	Equity earnings and distributions from the Timberland Venture were as follows for the years ended December 31 (in millions):
		2014		2013		2012
	Equity Earnings	$	63	$	63	$	59
	Distributions	57		56		56
Schedule of Cash Distributions	The Operating Partnership made the following cash distributions to PC Ventures for the years ended December 31 (in millions):
		2014		2013		2012
	Cash Distributions	$	58	$	58	$	58

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Revenues From Manufactured Products By Product Line [Textblock]	Revenues from the Manufacturing Segment by product line were as follows for the years ended December 31 (in millions):
			2014			2013			2012
	Lumber		$	109		$	95		$	78
	Plywood		87			92			91
	MDF		172			175			155
	Total		$	368		$	362		$	324
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The tables below present information about reported segments for the years ended December 31 (in millions):
		Northern			Southern			Real			Manufacturing(C)		Energy and Natural Resources(D)		Other(E)		Total(F)
		Resources(A)			Resources			Estate(B)
	2014
	External Revenues	$	236		$	531		$	289		$	368	$	34	$	18	$	1,476
	Intersegment Revenues	28			—			—			—		—		—		28
	Export Revenues	10			9			—			28		—		—		47
	Depreciation, Depletion and Amortization	28			82			1			14		8		—		133
	Basis of Real Estate Sold	—			—			129			—		—		—		129
	Other Operating Gain	—			—			—			11		2		—		13
	Equity Earnings	—			—			—			—		—		3		3
	Operating Income	44			137			133			49		25		2		390
	2013
	External Revenues	$	234		$	435		$	286		$	362	$	23	$	—	$	1,340
	Intersegment Revenues	26			—			—			—		—		—		26
	Export Revenues	15			6			—			29		—		—		50
	Depreciation, Depletion and Amortization	30			65			1			16		3		—		115
	Basis of Real Estate Sold	—			—			91			—		—		—		91
	Other Operating Gain	—			—			—			—		1		—		1
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	32			108			169			43		19		—		371
	2012
	External Revenues	$	224		$	417		$	352		$	324	$	22	$	—	$	1,339
	Intersegment Revenues	22			—			—			—		—		—		22
	Export Revenues	19			2			—			32		—		—		53
	Depreciation, Depletion and Amortization	26			67			1			15		1		—		110
	Basis of Real Estate Sold	—			—			138			—		—		—		138
	Other Operating Gain	—			—			—			—		—		—		—
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	20			90			187			29		19		—		345
	(A)	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
	(B)	The company recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 5 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
	(C)	During 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(D)	During 2014, the company agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the company sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(E)	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.
	(F)	Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $3 million, $4 million, and $4 million for 2014, 2013 and 2012, respectively.
Reconciliation of Total Segment Operating Income to Consolidated Income Before Income Taxes	A reconciliation of total segment operating income to income before income taxes is presented below for the years ended December 31 (in millions):
		2014			2013			2012
	Total Segment Operating Income	$	390		$	371		$	345
	Corporate and Other Unallocated Expenses	(67		)	(73		)	(65		)
	Other Unallocated Operating Income (Expense), net	2			(3		)	1
	Equity Earnings from Timberland Venture	63			63			59
	Total Interest Expense, net	(166		)	(141		)	(140		)
	Loss on Extinguishment of Debt	—			(4		)	—
	Income before Income Taxes	$	222		$	213		$	200
PLUM CREEK TIMBERLANDS L P [Member]
Revenues From Manufactured Products By Product Line [Textblock]	Revenues from the Manufacturing Segment by product line were as follows for the years ended December 31 (in millions):
			2014			2013			2012
	Lumber		$	109		$	95		$	78
	Plywood		87			92			91
	MDF		172			175			155
	Total		$	368		$	362		$	324
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The tables below present information about reported segments for the years ended December 31 (in millions):
		Northern			Southern			Real			Manufacturing(C)		Energy and Natural Resources(D)		Other(E)		Total(F)
		Resources(A)			Resources			Estate(B)
	2014
	External Revenues	$	236		$	531		$	289		$	368	$	34	$	18	$	1,476
	Intersegment Revenues	28			—			—			—		—		—		28
	Export Revenues	10			9			—			28		—		—		47
	Depreciation, Depletion and Amortization	28			82			1			14		8		—		133
	Basis of Real Estate Sold	—			—			129			—		—		—		129
	Other Operating Gain	—			—			—			11		2		—		13
	Equity Earnings	—			—			—			—		—		3		3
	Operating Income	44			137			133			49		25		2		390
	2013
	External Revenues	$	234		$	435		$	286		$	362	$	23	$	—	$	1,340
	Intersegment Revenues	26			—			—			—		—		—		26
	Export Revenues	15			6			—			29		—		—		50
	Depreciation, Depletion and Amortization	30			65			1			16		3		—		115
	Basis of Real Estate Sold	—			—			91			—		—		—		91
	Other Operating Gain	—			—			—			—		1		—		1
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	32			108			169			43		19		—		371
	2012
	External Revenues	$	224		$	417		$	352		$	324	$	22	$	—	$	1,339
	Intersegment Revenues	22			—			—			—		—		—		22
	Export Revenues	19			2			—			32		—		—		53
	Depreciation, Depletion and Amortization	26			67			1			15		1		—		110
	Basis of Real Estate Sold	—			—			138			—		—		—		138
	Other Operating Gain	—			—			—			—		—		—		—
	Equity Earnings	—			—			—			—		—		—		—
	Operating Income	20			90			187			29		19		—		345
	(A)	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
	(B)	The Operating Partnership recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 4 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
	(C)	During 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(D)	During 2014, the Operating Partnership agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the Operating Partnership sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
	(E)	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.
	(F)	Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $3 million, $4 million, and $4 million for 2014, 2013 and 2012, respectively.
Reconciliation of Total Segment Operating Income to Consolidated Income Before Income Taxes	A reconciliation of total segment operating income to income before income taxes is presented below for the years ended December 31 (in millions):
		2014			2013			2012
	Total Segment Operating Income	$	390		$	371		$	345
	Corporate and Other Unallocated Expenses	(67		)	(73		)	(65		)
	Other Unallocated Operating Income (Expense), net	2			(3		)	1
	Equity Earnings from Timberland Venture	63			63			59
	Interest Expense, net	(108		)	(83		)	(82		)
	Loss on Extinguishment of Debt	—			(4		)	—
	Income before Income Taxes	$	280		$	271		$	258

Unaudited_Selected_Quarterly_F1

Unaudited Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Quarterly Financial Information [Table Text Block]
	(In Millions, Except per Share Amounts)		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (C)
	2014
	Revenues		$	317	$	356	$	375	$	428
	Gross Profit		85		109		109		119
	Operating Income (A)		57		82		91		92
	Net Income		30		55		61		68
	Net Income per Share—Basic (B)		$	0.17	$	0.31	$	0.34	$	0.39
	Net Income per Share—Diluted (B)		$	0.17	$	0.31	$	0.34	$	0.39
	2013
	Revenues		$	340	$	303	$	366	$	331
	Gross Profit		110		90		122		98
	Operating Income		78		62		91		64
	Net Income		56		46		72		40
	Net Income per Share—Basic (B)		$	0.35	$	0.28	$	0.44	$	0.24
	Net Income per Share—Diluted (B)		$	0.35	$	0.28	$	0.44	$	0.24
	(A)	During the second quarter of 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 21 of the Notes to Consolidated Financial Statements.
	(B)	Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may not equal the total computed for the year.
	(C)	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Quarterly Financial Information [Table Text Block]
	(In Millions)		1st Quarter		2nd Quarter		3rd Quarter		4th Quarter (B)
	2014
	Revenues		$	317	$	356	$	375	$	428
	Gross Profit		85		109		109		119
	Operating Income (A)		57		82		91		92
	Net Income Available to Common Interest Partners		30		55		61		68
	2013
	Revenues		$	340	$	303	$	366	$	331
	Gross Profit		110		90		122		98
	Operating Income		78		62		91		64
	Net Income Available to Common Interest Partners		56		46		72		40
	(A)	During the second quarter of 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 19 of the Notes to Consolidated Financial Statements.
	(B)	During the fourth quarter of 2013, the Operating Partnership prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 9 of the Notes to Consolidated Financial Statements.

Accounting_Policies_Narrative_

Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
	Year			acre
	acre
	mill
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands, net (acres)	6,600,000
Product Conversion Facilities Owned in the Northwest United States	7
Higher and Better Use Timberlands, which are Expected to be Sold and/or Developed, acres	775,000
Total Acres of Non-Strategic Timberlands	225,000
Allowance for Doubtful Accounts	$0.20	$0.20
Capitalization and amortization period of major roads (years)	30
Capitalization and amortization period of logging roads (years)	6
Land Expect to Sell for Recreational Uses (acres)	500,000
Land Expect to Sell for Conservation (acres)	200,000
Land With Development Potential (Acres)	75,000
Real Estate Inventory Land and Land Development Costs	12	13
Real Estate Land and Land Development Costs	37	36
Assets Held for Sale	98	92
Depreciation Expense	21	24	22
PLUM CREEK TIMBER CO INC [Member] | Land Improvements [Member]
Property, Plant and Equipment, Useful Life	19 years
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands, net (acres)	6,600,000
Product Conversion Facilities Owned in the Northwest United States	7
Higher and Better Use Timberlands, which are Expected to be Sold and/or Developed, acres	775,000
Total Acres of Non-Strategic Timberlands	225,000
Ownership Percentage	100.00%
Allowance for Doubtful Accounts	0.2	0.2
Capitalization and amortization period of major roads (years)	30
Capitalization and amortization period of logging roads (years)	6
Land Expect to Sell for Recreational Uses (acres)	500,000
Land Expect to Sell for Conservation (acres)	200,000
Land With Development Potential (Acres)	75,000
Real Estate Inventory Land and Land Development Costs	12	13
Real Estate Land and Land Development Costs	37	36
Assets Held for Sale	98	92
Depreciation Expense	21	24	22
PLUM CREEK TIMBERLANDS L P [Member] | Land Improvements [Member]
Property, Plant and Equipment, Useful Life	19 years
Customer Concentration Risk [Member] | PLUM CREEK TIMBER CO INC [Member]
Revenue Concentration from Customer	7.00%	7.00%	7.00%
Customer Concentration Risk [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Revenue Concentration from Customer	7.00%	7.00%	7.00%
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Capital Contribution to LLC		152
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Capital Contribution to LLC		152
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Contributed Acres Of Timberlands To Venture				454,000
Preferred Interest in Venture				705
Common Interest in Venture				78
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Contributed Acres Of Timberlands To Venture				454,000
Preferred Interest in Venture				705
Common Interest in Venture				$78
Minimum [Member] | PLUM CREEK TIMBER CO INC [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	20 years
Minimum [Member] | PLUM CREEK TIMBER CO INC [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	20 years
Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | PLUM CREEK TIMBER CO INC [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	45 years
Maximum [Member] | PLUM CREEK TIMBER CO INC [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	20 years
Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Building [Member]
Property, Plant and Equipment, Useful Life	45 years
Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life	20 years

Accounting_Policies_Schedule_o

Accounting Policies Schedule of Other Operating Income and Expense (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Other Operating Income and Expense [Line Items]
Realized Gains from Grantor Trust Investments	$2	$1	$1
Insurance Recoveries	13	1	0
MDF Fire Impairment Loss	-2	0	0
Loss on Early Termination of an Equipment Lease	0	-5	0
Other Miscellaneous Operating Income and Expense	2	1	0
Other Operating Income (Expense), Net	15	-2	1
PLUM CREEK TIMBERLANDS L P [Member]
Other Operating Income and Expense [Line Items]
Realized Gains from Grantor Trust Investments	2	1	1
Insurance Recoveries	13	1	0
MDF Fire Impairment Loss	-2	0	0
Loss on Early Termination of an Equipment Lease	0	-5	0
Other Miscellaneous Operating Income and Expense	2	1	0
Other Operating Income (Expense), Net	$15	($2)	$1

Business_Acquisition_Narrative

Business Acquisition (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 06, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	acre	T
PLUM CREEK TIMBER CO INC [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			$22,000,000
Acquisition Date			6-Dec-13
Timberlands Acquired (Acres)	501,000
Timberlands Value Purchase and Sale Agreement	869,000,000
Non-Timberland Assets Value Purchase and Sale Agreement	65,000,000
Total Acquired Assets Value Purchase and Sale Agreement	934,000,000
Noncash Consideration (Installment Note Payable)			860,000,000
Total Purchase Price			1,100,000,000
Total Purchase Price Paid in Cash (gross)	74,000,000		226,000,000
Total Purchase Price Paid in Cash (after Post-Closing Adjustments)		0	221,000,000	0
Date of Equity (Common Stock) Issuance			4-Nov-13
Common Stock Issued			13,915,000
Proceeds from Issuance of Common Stock, net		0	607,000,000	0
Debt Repayments from Equity Offering Proceeds			376,000,000
Annual Harvest Increase From Acquisition (tons)		2,000,000
Acquisition Related Costs			5,000,000
PLUM CREEK TIMBER CO INC [Member] | MWV-CLP [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			152,000,000
Equity Method Investment Agreed Upon Value	531,000,000
Development Lands in Joint Venture (acres)	109,000
PLUM CREEK TIMBER CO INC [Member] | MWV-CLP (Class B Properties) [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			140,000,000
Equity Method Investment Agreed Upon Value	279,000,000
Development Lands in Joint Venture (acres)	87,000
Equity Method Investment, Ownership Percentage	50.00%	50.00%
PLUM CREEK TIMBER CO INC [Member] | MWV-CLP (Class A Properties) [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			12,000,000
Equity Method Investment Agreed Upon Value	252,000,000
Development Lands in Joint Venture (acres)	22,000
Equity Method Investment, Ownership Percentage	5.00%	4.00%
PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired			22,000,000
Acquisition Date			6-Dec-13
Timberlands Acquired (Acres)	501,000
Timberlands Value Purchase and Sale Agreement	869,000,000
Non-Timberland Assets Value Purchase and Sale Agreement	65,000,000
Total Acquired Assets Value Purchase and Sale Agreement	934,000,000
Noncash Consideration (Installment Note Payable)			860,000,000
Total Purchase Price			1,100,000,000
Total Purchase Price Paid in Cash (gross)	74,000,000		226,000,000
Total Purchase Price Paid in Cash (after Post-Closing Adjustments)		0	221,000,000	0
Capital Contributions from Parent			607,000,000
Debt Repayments from Equity Offering Proceeds			376,000,000
Annual Harvest Increase From Acquisition (tons)		2,000,000
Acquisition Related Costs			5,000,000
PLUM CREEK TIMBERLANDS L P [Member] | MWV-CLP [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			152,000,000
Equity Method Investment Agreed Upon Value	531,000,000
Development Lands in Joint Venture (acres)	109,000
PLUM CREEK TIMBERLANDS L P [Member] | MWV-CLP (Class B Properties) [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			140,000,000
Equity Method Investment Agreed Upon Value	279,000,000
Development Lands in Joint Venture (acres)	87,000
Equity Method Investment, Ownership Percentage	50.00%	50.00%
PLUM CREEK TIMBERLANDS L P [Member] | MWV-CLP (Class A Properties) [Member]
Business Acquisition [Line Items]
Capital Contribution to LLC			12,000,000
Equity Method Investment Agreed Upon Value	$252,000,000
Development Lands in Joint Venture (acres)	22,000
Equity Method Investment, Ownership Percentage	5.00%	4.00%

Business_Acquisition_Schedule_

Business Acquisition (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 06, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Business Acquisition [Line Items]
Timber And Logging Roads	$2,518	$2,630	$517
Timberlands	1,408	1,455	352
Minerals and Mineral Rights	289	298	57
Property, Plant, and Equipment			1
Equity Method Investments	126	139	139
Intangible Assets			15
Deferred Tax Assets			4
Total Assets Acquired			1,085
PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition [Line Items]
Timber And Logging Roads	2,518	2,630	517
Timberlands	1,408	1,455	352
Minerals and Mineral Rights	289	298	57
Property, Plant, and Equipment			1
Equity Method Investments	126	139	139
Intangible Assets			15
Deferred Tax Assets			4
Total Assets Acquired			$1,085

Business_Acquisition_Schedule_1

Business Acquisition (Schedule of Finite-Lived Intangible Assets) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$22
PLUM CREEK TIMBER CO INC [Member] | Wind Power Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	10
Amortization Period (in years)	20 years	[1]
PLUM CREEK TIMBER CO INC [Member] | Acquired Land Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	7	[2]
Amortization Period (in years)	10 years	[1],[2]
PLUM CREEK TIMBER CO INC [Member] | Fiber Supply Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	5
Amortization Period (in years)	10 years	[1]
PLUM CREEK TIMBERLANDS L P [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	22
PLUM CREEK TIMBERLANDS L P [Member] | Wind Power Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	10
Amortization Period (in years)	20 years	[1]
PLUM CREEK TIMBERLANDS L P [Member] | Acquired Land Leases [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	7	[2]
Amortization Period (in years)	10 years	[1],[2]
PLUM CREEK TIMBERLANDS L P [Member] | Fiber Supply Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$5
Amortization Period (in years)	10 years	[1]
[1]	The amortization method for the purchased intangible assets approximates straight-line.
[2]	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.

Business_Acquisition_Actual_Im

Business Acquisition (Actual Impact of Acquisition) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Revenue of Acquiree since Acquisition Date	$3
Earnings or Loss of Acquiree since Acquisition Date	0
PLUM CREEK TIMBERLANDS L P [Member]
Revenue of Acquiree since Acquisition Date	3
Earnings or Loss of Acquiree since Acquisition Date	$0

Business_Acquisition_Pro_Forma

Business Acquisition (Pro Forma Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro Forma Revenue	$1,491,000,000	$1,513
Pro Forma Net Income (Loss)	253,000,000	238
PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro Forma Revenue	1,491,000,000	1,513,000,000
Pro Forma Net Income (Loss)	253,000,000	238,000,000
MeadWestvaco Assets [Member] | PLUM CREEK TIMBER CO INC [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro Forma Revenue	87,000,000	99,000,000
Pro Forma Cost of Sales	12,000,000	18,000,000
Land Dispositions, Pro Forma (Acres)	41,000	49,000
MeadWestvaco Assets [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro Forma Revenue	87,000,000	99,000,000
Pro Forma Cost of Sales	$12,000,000	$18,000,000
Land Dispositions, Pro Forma (Acres)	41,000	49,000

Earnings_Per_Share_Schedule_of

Earnings Per Share (Schedule of Basic and Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended																12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income Available to Common Stockholders																	$214	$214	$203
Denominator for Basic Earnings per Share																	176.7	164.6	161.5
Effect of Dilutive Securities - Stock Options																	0.2	0.3	0.3
Effect of Dilutive Securities - Restricted Stock, Restricted Stock Units and Value Management Plan																	0.1	0.1	0.1
Denominator for Diluted Earnings per Share - Adjusted for Dilutive Securities																	177	165	161.9
Net Income per Share-Basic																	$1.21	$1.30	$1.25
Net Income per Share-Diluted																	$1.21	$1.30	$1.25
PLUM CREEK TIMBER CO INC [Member]
Net Income Available to Common Stockholders	$68		$61		$55		$30		$40	[1]	$72		$46		$56		$214	$214	$203
Denominator for Basic Earnings per Share																	176.7	164.6	161.5
Denominator for Diluted Earnings per Share - Adjusted for Dilutive Securities																	177	165	161.9
Net Income per Share-Basic	$0.39	[2]	$0.34	[2]	$0.31	[2]	$0.17	[2]	$0.24	[2]	$0.44	[2]	$0.28	[2]	$0.35	[2]	$1.21	$1.30	$1.25
Net Income per Share-Diluted	$0.39	[2]	$0.34	[2]	$0.31	[2]	$0.17	[2]	$0.24	[2]	$0.44	[2]	$0.28	[2]	$0.35	[2]	$1.21	$1.30	$1.25
[1]	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.
[2]	Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may not equal the total computed for the year.

Earnings_Per_Share_Schedule_of1

Earnings Per Share (Schedule of Antidilutive Options) (Details)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Number of Options	0.1	0	0.9
Range of Exercise Prices	$42.98 to $43.23	N/A	$41.55B toB $43.23
Expiration on or before	Feb-18	N/A	Feb-21

Inventories_Details

Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Raw Materials (primarily logs)	$12	$9
Work-In-Process	3	2
Finished Goods	31	30
Total before Supplies	46	41
Supplies	15	14
Total	61	55
PLUM CREEK TIMBERLANDS L P [Member]
Raw Materials (primarily logs)	12	9
Work-In-Process	3	2
Finished Goods	31	30
Total before Supplies	46	41
Supplies	15	14
Total	$61	$55

Timber_and_Timberlands_Timber_

Timber and Timberlands (Timber and Timberlands and Impairment Losses Tables) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 06, 2013
PLUM CREEK TIMBER CO INC [Member]
Timber and Logging Roads, net	$2,518		$2,630			$517
Timber Deeds, net	83		95
Timberlands	1,408		1,455			352
Timber and Timberlands, net	4,009		4,180
Impairment Losses	7	[1],[2]	4	[3]	0
Book Basis Of Property	46	[1],[2]	37	[3]	4
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Logging Roads, net	2,518		2,630			517
Timber Deeds, net	83		95
Timberlands	1,408		1,455			352
Timber and Timberlands, net	4,009		4,180
Impairment Losses	7	[4],[5]	4	[6]	0
Book Basis Of Property	$46	[4],[5]	$37	[6]	$4
[1]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[2]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[3]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
[4]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[5]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[6]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.

Timber_and_Timberlands_Narrati

Timber and Timberlands (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 06, 2013
	acre		acre		T		acre
			T
PLUM CREEK TIMBER CO INC [Member]
Basis of Real Estate Sold	$129		$91		$138
Land Sales	289		286		352
Impairment Losses	7	[1],[2]	4	[3]	0
Land Acquisition-Business Combination (Acres)							501,000
Timberlands Value Purchase and Sale Agreement							869
Land Acquisitions (Acres)			50,000
Payments to Acquire Timberlands	0		81		18
Land Dispositions (Acres)	184,000		168,000
Loss Related to Forest Fires			4
Timber deeds contract expiration	2020
Payments to Acquire Timber Deeds	0		18		98	5
TimberDeedTonsPurchased			900,000		4,700,000
Total Payments to Acquire Timber Deeds Including Deposits					103
Assets Held for Sale	98		92
PLUM CREEK TIMBER CO INC [Member] | Northern Resources [Member]
Land Dispositions (Acres)	136,000		66,000
PLUM CREEK TIMBER CO INC [Member] | Southern Resources [Member]
Land Dispositions (Acres)	48,000		102,000
PLUM CREEK TIMBERLANDS L P [Member]
Basis of Real Estate Sold	129		91		138
Land Sales	289		286		352
Impairment Losses	7	[4],[5]	4	[6]	0
Land Acquisition-Business Combination (Acres)							501,000
Timberlands Value Purchase and Sale Agreement							869
Land Acquisitions (Acres)			50,000
Payments to Acquire Timberlands	0		81		18
Land Dispositions (Acres)	184,000		168,000
Loss Related to Forest Fires			4
Timber deeds contract expiration	2020
Payments to Acquire Timber Deeds	0		18		98	5
TimberDeedTonsPurchased			900,000		4,700,000
Total Payments to Acquire Timber Deeds Including Deposits					103
Assets Held for Sale	98		92
PLUM CREEK TIMBERLANDS L P [Member] | Northern Resources [Member]
Land Dispositions (Acres)	136,000		66,000
PLUM CREEK TIMBERLANDS L P [Member] | Southern Resources [Member]
Land Dispositions (Acres)	48,000		102,000
Washington TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Land Dispositions (Acres)	48,000
Washington TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Land Dispositions (Acres)	48,000
Montana TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Land Dispositions (Acres)	117,000
Montana TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Land Dispositions (Acres)	117,000
Total TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Basis of Real Estate Sold	122
Land Sales	131
Land Dispositions (Acres)	165,000
Total TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Basis of Real Estate Sold	122
Land Sales	$131
Land Dispositions (Acres)	165,000
[1]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[2]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[3]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
[4]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[5]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[6]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.

Minerals_and_Mineral_Rights_Mi

Minerals and Mineral Rights Minerals and Mineral Rights (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013		Dec. 06, 2013
PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals, net	$55	$60
Mineral Rights, net	234	238
Minerals and Mineral Rights, net	289	298		57
Finite-lived Intangible Assets Acquired		22
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals, net	55	60
Mineral Rights, net	234	238
Minerals and Mineral Rights, net	289	298		57
Finite-lived Intangible Assets Acquired		22
Coal [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals, net				50
Depletion	1	1
Coal [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Minerals, net				50
Depletion	1	1
Use Rights [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Finite-lived Intangible Assets Acquired		7	[1]
Use Rights [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Minerals and Mineral Rights [Line Items]
Finite-lived Intangible Assets Acquired		$7	[1]
[1]	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.

Minerals_and_Mineral_Rights_Sc

Minerals and Mineral Rights Schedule of Finite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2014
			T
PLUM CREEK TIMBER CO INC [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$22
PLUM CREEK TIMBER CO INC [Member] | South Carolina Quarries [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	76	[1]		76	[1]
Accumulated Amortization	0	[1]		-2	[1]
Carrying Amount, Net	76	[1]		74	[1]
Aggregate Reserves Tons Purchased			144,000,000
Contract Expiration			2052
PLUM CREEK TIMBER CO INC [Member] | Georgia Quarries [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	156	[2]		156	[2]
Accumulated Amortization	-1	[2]		-5	[2]
Carrying Amount, Net	155	[2]		151	[2]
Aggregate Reserves Tons Purchased	255,000,000
Contract Expiration	2051
Payments to Acquire Intangible Assets	156
PLUM CREEK TIMBER CO INC [Member] | Surface Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	7	[3]		10	[3]
Accumulated Amortization	0	[3]		-1	[3]
Carrying Amount, Net	7	[3]		9	[3]
Finite-lived Intangible Assets Acquired	7	[4]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	[4],[5]
Finite-Lived Intangible Assets, Purchase Accounting Adjustments				3
PLUM CREEK TIMBER CO INC [Member] | Total Mineral Rights and Surface Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	239			242
Accumulated Amortization	-1			-8
Carrying Amount, Net	238			234
PLUM CREEK TIMBERLANDS L P [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	22
PLUM CREEK TIMBERLANDS L P [Member] | South Carolina Quarries [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	76	[6]		76	[6]
Accumulated Amortization	0	[6]		-2	[6]
Carrying Amount, Net	76	[6]		74	[6]
Aggregate Reserves Tons Purchased			144,000,000
Contract Expiration			2052
PLUM CREEK TIMBERLANDS L P [Member] | Georgia Quarries [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	156	[7]		156	[7]
Accumulated Amortization	-1	[7]		-5	[7]
Carrying Amount, Net	155	[7]		151	[7]
Aggregate Reserves Tons Purchased	255,000,000
Contract Expiration	2051
Payments to Acquire Intangible Assets	156
PLUM CREEK TIMBERLANDS L P [Member] | Surface Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	7	[8]		10	[8]
Accumulated Amortization	0	[8]		-1	[8]
Carrying Amount, Net	7	[8]		9	[8]
Finite-lived Intangible Assets Acquired	7	[4]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	[4],[5]
Finite-Lived Intangible Assets, Purchase Accounting Adjustments				3
PLUM CREEK TIMBERLANDS L P [Member] | Total Mineral Rights and Surface Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	239			242
Accumulated Amortization	-1			-8
Carrying Amount, Net	$238			$234
[1]	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
[2]	In September 2013, the company acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The company is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
[3]	In connection with the timberland acquisition from MeadWestvaco Corporation on DecemberB 6, 2013, the company acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.During 2014, upon finalization of the valuation, the company adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.
[4]	The acquired land leases are associated with the acquired minerals and are included in Minerals and Mineral Rights, net on both the preceding Assets Acquired table and on the Consolidated Balance Sheets.
[5]	The amortization method for the purchased intangible assets approximates straight-line.
[6]	Relates to mineral rights in approximately 144 million tons of aggregate reserves at four quarries in South Carolina in which the Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from the quarries. Our mineral rights expire in 2052.
[7]	In September 2013, the Operating Partnership acquired mineral rights in approximately 255 million tons of aggregate reserves at four quarries in Georgia for approximately $156 million. The Operating Partnership is entitled to an overriding royalty in connection with the gross proceeds from the sale of crushed stone from these quarries. Our mineral rights expire in 2051.
[8]	In connection with the timberland acquisition from MeadWestvaco Corporation on DecemberB 6, 2013, the Operating Partnership acquired certain proven and probable coal reserves (see above) along with the related surface leases. These surface lease intangibles had an estimated acquisition date fair value of $7 million and are being amortized over ten years. The value of the surface leases is included in Mineral Rights, net.During 2014, upon finalization of the valuation, the Operating Partnership adjusted its purchase price allocation and reclassified $3 million from the acquired coal reserves to the surface leases. This reclassification was within Minerals and Mineral Rights, net on the Consolidated Balance Sheets. See Note 2 of the Notes to Consolidated Financial Statements.

Minerals_and_Mineral_Rights_Sc1

Minerals and Mineral Rights Schedule of Future Amortization of Finite-Lived Intangible Assets (Details) (Total Mineral Rights and Surface Leases [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$6	$1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	7
Finite-Lived Intangible Assets, Amortization Expense, Year Two	7
Finite-Lived Intangible Assets, Amortization Expense, Year Three	7
Finite-Lived Intangible Assets, Amortization Expense, Year Four	7
Finite-Lived Intangible Assets, Amortization Expense, Year Five	7
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	199
Carrying Amount, Net	234	238
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	6	1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	7
Finite-Lived Intangible Assets, Amortization Expense, Year Two	7
Finite-Lived Intangible Assets, Amortization Expense, Year Three	7
Finite-Lived Intangible Assets, Amortization Expense, Year Four	7
Finite-Lived Intangible Assets, Amortization Expense, Year Five	7
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	199
Carrying Amount, Net	$234	$238

Intangible_Assets_Schedule_of_

Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member] | Wind Power Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	$10	$10
Accumulated Amortization	-1	0
Carrying Amount, Net	9	10
PLUM CREEK TIMBER CO INC [Member] | Fiber Supply Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	5	5
Accumulated Amortization	0	0
Carrying Amount, Net	5	5
PLUM CREEK TIMBER CO INC [Member] | Total Wind Power Leases and Fiber Supply Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	15	15
Accumulated Amortization	-1	0
Carrying Amount, Net	14	15
PLUM CREEK TIMBERLANDS L P [Member] | Wind Power Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	10	10
Accumulated Amortization	-1	0
Carrying Amount, Net	9	10
PLUM CREEK TIMBERLANDS L P [Member] | Fiber Supply Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	5	5
Accumulated Amortization	0	0
Carrying Amount, Net	5	5
PLUM CREEK TIMBERLANDS L P [Member] | Total Wind Power Leases and Fiber Supply Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount, Gross	15	15
Accumulated Amortization	-1	0
Carrying Amount, Net	$14	$15

Intangible_Assets_Schedule_of_1

Intangible Assets Schedule of Future Amortization of Finite-Lived Intangible Assets and Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$22
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		22
Wind Power Leases [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		20 years	[1]
Finite-lived Intangible Assets Acquired		10
Carrying Amount, Net	9	10
Wind Power Leases [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		20 years	[1]
Finite-lived Intangible Assets Acquired		10
Carrying Amount, Net	9	10
Fiber Supply Agreement [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years	[1]
Finite-lived Intangible Assets Acquired		5
Carrying Amount, Net	5	5
Fiber Supply Agreement [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years	[1]
Finite-lived Intangible Assets Acquired		5
Carrying Amount, Net	5	5
Total Wind Power Leases and Fiber Supply Agreements [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	9
Carrying Amount, Net	14	15
Amortization of Intangible Assets	1	0
Total Wind Power Leases and Fiber Supply Agreements [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Future Amortization of Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	9
Carrying Amount, Net	14	15
Amortization of Intangible Assets	$1	$0
[1]	The amortization method for the purchased intangible assets approximates straight-line.

Property_Plant_and_Equipment_P

Property, Plant and Equipment (Property, Plant and Equipment Table) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Land, Buildings and Improvements	$97	$91
Machinery and Equipment	331	323
Property, Plant and Equipment, gross	428	414
Accumulated Depreciation	-308	-296
Property, Plant and Equipment, net	120	118
PLUM CREEK TIMBERLANDS L P [Member]
Land, Buildings and Improvements	97	91
Machinery and Equipment	331	323
Property, Plant and Equipment, gross	428	414
Accumulated Depreciation	-308	-296
Property, Plant and Equipment, net	$120	$118

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
REIT's book basis exceeding tax basis	$1,800,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	0	0
Accrued interest or penalties related to income taxes	0	0
Federal statutory income tax rate	35.00%
State Operating Loss Carryforwards	261,000,000
Deferred Tax Assets, Operating Loss Carryforwards	12,000,000	13,000,000
Operating Loss Carryforwards, Expiration Dates (Year)	31-Dec-15
Valuation Allowance	12,000,000	10,000,000
Deferred tax gross assets	65,000,000	61,000,000
Unrecognized Tax Benefits	0	0
Open Tax Year	2010
Tax Liability from Potential Adjustment	100,000,000
Gain from Potential Tax Adjustment	600,000,000
Percentage of Gain Distrbuted in Common Stock	80.00%
PLUM CREEK TIMBERLANDS L P [Member]
REIT's book basis exceeding tax basis	1,800,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	0	0
Accrued interest or penalties related to income taxes	0	0
Federal statutory income tax rate	35.00%
State Operating Loss Carryforwards	261,000,000
Deferred Tax Assets, Operating Loss Carryforwards	12,000,000	13,000,000
Operating Loss Carryforwards, Expiration Dates (Year)	31-Dec-15
Valuation Allowance	12,000,000	10,000,000
Deferred tax gross assets	65,000,000	61,000,000
Unrecognized Tax Benefits	0	0
Open Tax Year	2010
Tax Liability from Potential Adjustment	100,000,000
Gain from Potential Tax Adjustment	$600,000,000
Percentage of Gain Distrbuted in Common Stock	80.00%

Income_Taxes_Schedule_of_Incom

Income Taxes (Schedule of Income Tax Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Federal-Current	$3	$0	$0
State-Current	1	0	0
Federal-Deferred	4	-1	-3
State-Deferred	-2	0	0
Benefit from Operating Loss Carryforward	0	-1	-1
Change to Valuation Allowance	2	1	1
Provision (Benefit) for Income Taxes on Income From Continuing Operations	8	-1	-3
PLUM CREEK TIMBERLANDS L P [Member]
Federal-Current	3	0	0
State-Current	1	0	0
Federal-Deferred	4	-1	-3
State-Deferred	-2	0	0
Benefit from Operating Loss Carryforward	0	-1	-1
Change to Valuation Allowance	2	1	1
Provision (Benefit) for Income Taxes on Income From Continuing Operations	$8	($1)	($3)

Income_Taxes_Schedule_of_Recon

Income Taxes (Schedule of Reconciliation of Income Tax Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	$78	$75	$70
REIT Income not Subject to Federal Tax	-58	-69	-66
Change to Valuation Allowance	2	1	1
State Income Tax Expense (Benefit), net of Federal Benefit	-1	-1	-1
Permanent Book-Tax Differences	-13	-7	-7
Provision (Benefit) for Income Taxes on Income From Continuing Operations	8	-1	-3
PLUM CREEK TIMBERLANDS L P [Member]
Provision for Income Taxes on Income from Continuing Operations Computed at the Federal Statutory Tax Rate of 35%	78	75	70
REIT Income not Subject to Federal Tax	-58	-69	-66
Change to Valuation Allowance	2	1	1
State Income Tax Expense (Benefit), net of Federal Benefit	-1	-1	-1
Permanent Book-Tax Differences	-13	-7	-7
Provision (Benefit) for Income Taxes on Income From Continuing Operations	$8	($1)	($3)

Income_Taxes_Schedule_of_Alloc

Income Taxes (Schedule of Allocation of Income Tax Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Provision (Benefit) for Income Taxes on Income From Continuing Operations	$8	($1)	($3)
Other Comprehensive Income	-7	7	1
Additional Paid-In Capital (Share-Based Compensation	0	-1	0
Total Income Tax Expense (Benefit)	1	5	-2
PLUM CREEK TIMBERLANDS L P [Member]
Provision (Benefit) for Income Taxes on Income From Continuing Operations	8	-1	-3
Other Comprehensive Income	-7	7	1
Additional Paid-In Capital (Share-Based Compensation	0	-1	0
Total Income Tax Expense (Benefit)	$1	$5	($2)

Income_Taxes_Schedule_of_Compo

Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Net Operating Loss Carryforwards	$12	$13
Accrued Compensation	8	9
Accrued Pension Benefits	16	9
Timber and Timberlands	15	13
Accrued Worker's Compensation Benefits	3	4
Other Accruals and Reserves	6	7
Valuation Allowance	-12	-10
Deferred Income Tax Assets, Total	48	45
Machinery and Equipment	-19	-19
Deferred Income Tax Liabilities, Total	-19	-19
Deferred Income Tax Asset, net	29	26
PLUM CREEK TIMBERLANDS L P [Member]
Net Operating Loss Carryforwards	12	13
Accrued Compensation	8	9
Accrued Pension Benefits	16	9
Timber and Timberlands	15	13
Accrued Worker's Compensation Benefits	3	4
Other Accruals and Reserves	6	7
Valuation Allowance	-12	-10
Deferred Income Tax Assets, Total	48	45
Machinery and Equipment	-19	-19
Deferred Income Tax Liabilities, Total	-19	-19
Deferred Income Tax Asset, net	$29	$26

Income_Taxes_Schedule_of_Defer

Income Taxes (Schedule of Deferred Income Tax Asset (Liability) Classification) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Current Deferred Income Tax Asset	$6	$9
Non Current Deferred Income Tax Asset	23	17
Deferred Income Tax Asset, net	29	26
PLUM CREEK TIMBERLANDS L P [Member]
Current Deferred Income Tax Asset	6	9
Non Current Deferred Income Tax Asset	23	17
Deferred Income Tax Asset, net	$29	$26

REIT_Disclosures_Details

REIT Disclosures (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Capital Gain Dividend	$1.76	$1.74	$1.68
Non-Taxable Return of Capital	$0	$0	$0
Total Distributions	$1.76	$1.74	$1.68

BorrowingsSchedule_of_Debt_Det

Borrowings-Schedule of Debt (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2008	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Total	$3,293		$3,664
Current Portion of Long-Term Debt	439		0
Line of Credit	95		467
Long Term Portion Of Total Borrowings	2,759		3,197
Long-term Portion	1,976		2,414
PLUM CREEK TIMBERLANDS L P [Member]
Total	2,510		2,881
Current Portion of Long-Term Debt	439		0
Line of Credit	95		467
Long-term Portion	1,976		2,414
Term Credit Agreement [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	225		225
Debt Instrument, Maturity Date	3-Apr-19
Debt Instrument, Interest Rate, Effective Percentage	1.67%		1.66%
Debt Instrument, Interest Rate Terms	LIBOR plus 1.50%
Term Credit Agreement [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Total	225		225
Debt Instrument, Maturity Date	3-Apr-19
Debt Instrument, Interest Rate, Effective Percentage	1.67%		1.66%
Debt Instrument, Interest Rate Terms	LIBOR plus 1.50%
Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11% [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	439		438
Debt Instrument, Maturity Date	15-Nov-15
Debt Instrument, Interest Rate, Effective Percentage	6.11%
Debt Instrument, Interest Rate, Stated Percentage	5.88%
Debt Instrument, Unamortized Discount	0.8
Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Total	439		438
Debt Instrument, Maturity Date	15-Nov-15
Debt Instrument, Interest Rate, Effective Percentage	6.11%
Debt Instrument, Interest Rate, Stated Percentage	5.88%
Debt Instrument, Unamortized Discount	0.8
Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71% [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	568		568
Debt Instrument, Maturity Date	15-Mar-21
Debt Instrument, Interest Rate, Effective Percentage	4.71%
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Debt Instrument, Unamortized Discount	0.2
Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Total	568		568
Debt Instrument, Maturity Date	15-Mar-21
Debt Instrument, Interest Rate, Effective Percentage	4.71%
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Debt Instrument, Unamortized Discount	0.2
Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34% [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	323		323
Debt Instrument, Maturity Date	15-Mar-23
Debt Instrument, Interest Rate, Effective Percentage	3.34%
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Unamortized Discount	2.2
Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Total	323		323
Debt Instrument, Maturity Date	15-Mar-23
Debt Instrument, Interest Rate, Effective Percentage	3.34%
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Unamortized Discount	2.2
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	860		860
Debt Instrument, Maturity Date	6-Dec-23
Debt Instrument, Interest Rate, Stated Percentage	5.21%
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Total	860		860
Debt Instrument, Maturity Date	6-Dec-23
Debt Instrument, Interest Rate, Stated Percentage	5.21%
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Total	783		783
Debt Instrument, Maturity Date	1-Oct-18
Related Party Transaction, Rate	7.38%	7.38%
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Line of Credit	95		467
Debt Instrument, Maturity Date	15-Jan-19
Debt, Weighted Average Interest Rate	1.34%		1.37%
Line of Credit Facility, Interest Rate Description	LIBOR plus 1.25%
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit	$95		$467
Debt Instrument, Maturity Date	15-Jan-19
Debt, Weighted Average Interest Rate	1.34%		1.37%
Line of Credit Facility, Interest Rate Description	LIBOR plus 1.25%

Borrowings_Narrative_Details

Borrowings (Narrative) (Details) (USD $)	12 Months Ended				1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008	Jan. 31, 2015
PLUM CREEK TIMBER CO INC [Member]
Line of Credit, Outstanding	$95	$467
Long-term Debt	3,293	3,664
Line of Credit Facility, Decrease, Repayments	1,679	1,408	2,087
Patronage Earned	8	3
Redemption premium due up early retirement of senior notes	114	117
Installment Note Payable		860
Note Payable to Timberland Venture	783	783
PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit, Outstanding	95	467
Long-term Debt	2,510	2,881
Line of Credit Facility, Decrease, Repayments	1,679	1,408	2,087
Patronage Earned	8	3
Redemption premium due up early retirement of senior notes	114	117
Installment Note Payable		860
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	3-Apr-19
Long-term Debt	225	225
Effective Interest Rate, Percentage	1.00%	1.00%
Debt Instrument, Interest Rate, Effective Percentage	1.67%	1.66%
Term Credit Agreement, Interest rate terms	LIBOR plus 1.50%
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Maturity Date	3-Apr-19
Long-term Debt	225	225
Effective Interest Rate, Percentage	1.00%	1.00%
Debt Instrument, Interest Rate, Effective Percentage	1.67%	1.66%
Term Credit Agreement, Interest rate terms	LIBOR plus 1.50%
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Long-term Debt, Gross	1,300
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Long-term Debt, Gross	1,300
Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11% [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	15-Nov-15
Long-term Debt	439	438
Stated Interest Rate	5.88%
Debt Instrument, Interest Rate, Effective Percentage	6.11%
Long-term Debt, Gross	439
Senior Notes due 2015, 5.875% less unamortized discount of $0.8 at 12/31/14, effective rate of 6.11% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Maturity Date	15-Nov-15
Long-term Debt	439	438
Stated Interest Rate	5.88%
Debt Instrument, Interest Rate, Effective Percentage	6.11%
Long-term Debt, Gross	439
Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71% [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	15-Mar-21
Long-term Debt	568	568
Stated Interest Rate	4.70%
Debt Instrument, Interest Rate, Effective Percentage	4.71%
Long-term Debt, Gross	569
Senior Notes due 2021, 4.70% less unamortized discount of $0.2 at 12/31/14, effective rate of 4.71% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Maturity Date	15-Mar-21
Long-term Debt	568	568
Stated Interest Rate	4.70%
Debt Instrument, Interest Rate, Effective Percentage	4.71%
Long-term Debt, Gross	569
Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34% [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	15-Mar-23
Long-term Debt	323	323
Stated Interest Rate	3.25%
Debt Instrument, Interest Rate, Effective Percentage	3.34%
Long-term Debt, Gross	325
Senior Notes due 2023, 3.25% less unamortized discount of $2.2 at 12/31/14, effective rate of 3.34% [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Maturity Date	15-Mar-23
Long-term Debt	323	323
Stated Interest Rate	3.25%
Debt Instrument, Interest Rate, Effective Percentage	3.34%
Long-term Debt, Gross	325
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	6-Dec-23
Long-term Debt	860	860
Effective Interest Rate, Percentage	4.50%	4.50%
Stated Interest Rate	5.21%
Installment Note Payable	860
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Maturity Date	6-Dec-23
Long-term Debt	860	860
Effective Interest Rate, Percentage	4.50%	4.50%
Stated Interest Rate	5.21%
Installment Note Payable	860
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Maturity Date	1-Oct-18
Long-term Debt	783	783
Note Payable to Timberland Venture	783			783
Note Payable Interest rate	7.38%			7.38%
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Line of Credit	700
Letters of Credit Outstanding, Amount	2
Debt Instrument, Maturity Date	15-Jan-19
Debt, Weighted Average Interest Rate	1.34%	1.37%
Line of Credit, Interest Rate Terms	LIBOR plus 1.25%
Letter of Credit, Standby	60
Line of Credit, Outstanding	95	467
Line of Credit, Remained available	603
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit	700
Letters of Credit Outstanding, Amount	2
Debt Instrument, Maturity Date	15-Jan-19
Debt, Weighted Average Interest Rate	1.34%	1.37%
Line of Credit, Interest Rate Terms	LIBOR plus 1.25%
Letter of Credit, Standby	60
Line of Credit, Outstanding	95	467
Line of Credit, Remained available	603
Debt [Member] | Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Line of Credit Facility, Decrease, Repayments					95
Debt [Member] | Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit Facility, Decrease, Repayments					$95
Minimum [Member] | Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Line of Credit, Interest Rate Terms	LIBOR plus 1%
Minimum [Member] | Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit, Interest Rate Terms	LIBOR plus 1%
Maximum [Member] | Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Line of Credit, Interest Rate Terms	LIBOR plus 2%
Maximum [Member] | Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Line of Credit, Interest Rate Terms	LIBOR plus 2%

Borrowings_Schedule_of_Debt_Pr

Borrowings (Schedule of Debt Principal Payments and Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Decrease, Repayments	$0	$509
Loss on Extinguishment of Debt	0	4	0
PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Decrease, Repayments	0	509
Loss on Extinguishment of Debt	0	4	0
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Decrease, Repayments	0	24
Early Repayment Of Debt		24
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Decrease, Repayments	0	24
Early Repayment Of Debt		24
Private Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Decrease, Repayments	0	260
Early Repayment Of Debt		10
Private Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Decrease, Repayments	0	260
Early Repayment Of Debt		10
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument, Decrease, Repayments	0	225
Early Repayment Of Debt		225
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument, Decrease, Repayments	0	225
Early Repayment Of Debt		$225

Borrowings_Schedule_of_Aggrega

Borrowings (Schedule of Aggregate Maturities On Debt Agreements) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Total	$3,293	$3,664
PLUM CREEK TIMBERLANDS L P [Member]
Total	2,510	2,881
Debt Agreements [Member] | PLUM CREEK TIMBER CO INC [Member]
2015	439
2016	0
2017	0
2018	0
2019	320
Thereafter	1,754
Total	2,513
Debt Agreements [Member] | PLUM CREEK TIMBERLANDS L P [Member]
2015	439
2016	0
2017	0
2018	0
2019	320
Thereafter	1,754
Total	2,513
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
2015	0
2016	0
2017	0
2018	783
2019	0
Thereafter	0
Total	783	783
Total Debt Maturities [Member] | PLUM CREEK TIMBER CO INC [Member]
2015	439
2016	0
2017	0
2018	783
2019	320
Thereafter	1,754
Total	$3,296

Fair_Value_Measurements_Level_

Fair Value Measurements (Level 1 Assets Reported in the Company's Financial Statements at Fair Value, Measured on a Recurring Basis) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Cash and Cash Equivalents	$92		$433		$356	$254
Domestic Portion of Mutual Funds (percentage)	45.00%
International Portion of Mutual Funds (percentage)	25.00%
Debt Securities Portion of Mutual Funds (percentage)	30.00%
PLUM CREEK TIMBERLANDS L P [Member]
Cash and Cash Equivalents	92		433		356	254
Domestic Portion of Mutual Funds (percentage)	45.00%
International Portion of Mutual Funds (percentage)	25.00%
Debt Securities Portion of Mutual Funds (percentage)	30.00%
Fair Value, Measurements, Recurring [Member] | PLUM CREEK TIMBER CO INC [Member]
Cash Equivalents	90	[1]	428	[1]
Available-for-Sale Securities	43	[2]	40	[2]
Trading Securities	5	[2]	5	[2]
Investments, Fair Value Disclosure	138		473
Fair Value, Measurements, Recurring [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Cash Equivalents	90	[1]	428	[1]
Available-for-Sale Securities	43	[2]	40	[2]
Trading Securities	5	[2]	5	[2]
Investments, Fair Value Disclosure	138		473
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Cash Equivalents	90	[1]	428	[1]
Available-for-Sale Securities	43	[2]	40	[2]
Trading Securities	5	[2]	5	[2]
Investments, Fair Value Disclosure	138		473
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Cash Equivalents	90	[1]	428	[1]
Available-for-Sale Securities	43	[2]	40	[2]
Trading Securities	5	[2]	5	[2]
Investments, Fair Value Disclosure	$138		$473
[1]	Consists of several money market funds and is included in the $92 million and $433 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at DecemberB 31, 2014 and DecemberB 31, 2013, respectively.
[2]	Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at DecemberB 31, 2014 and DecemberB 31, 2013. At DecemberB 31, 2014, investments in these mutual funds were approximately 45% in domestic (U.S.) equities, 25% in international equities and 30% in debt securities.

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Available-for-sale Securities, Amortized Cost Basis	$31	$28
Deferred Compensation Obligations Included in Other Liabilities	5	5
PLUM CREEK TIMBERLANDS L P [Member]
Available-for-sale Securities, Amortized Cost Basis	31	28
Deferred Compensation Obligations Included in Other Liabilities	6	6
Trading Securities [Member] | PLUM CREEK TIMBER CO INC [Member]
Deferred Compensation Obligations Included in Other Liabilities	5	5
Trading Securities [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Deferred Compensation Obligations Included in Other Liabilities	$5	$5

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value, Liabilities Measured on Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$3,293,000,000	$3,664,000,000
Debt Instrument, Fair Value Disclosure	3,516,000,000	3,814,000,000
Line of Credit	95,000,000	467,000,000
Installment Note Payable		860,000,000
Note Payable to Timberland Venture	783,000,000	783,000,000
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	2,624,000,000	2,898,000,000
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	892,000,000	916,000,000
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	2,510,000,000	2,881,000,000
Debt Instrument, Fair Value Disclosure	2,624,000,000	2,898,000,000
Line of Credit	95,000,000	467,000,000
Installment Note Payable		860,000,000
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	2,624,000,000	2,898,000,000
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	1,330,000,000	1,329,000,000
Debt Instrument, Fair Value Disclosure	1,398,000,000	1,361,000,000
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	1,398,000,000	1,361,000,000
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	1,330,000,000	1,329,000,000
Debt Instrument, Fair Value Disclosure	1,398,000,000	1,361,000,000
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	1,398,000,000	1,361,000,000
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	225,000,000	225,000,000
Debt Instrument, Fair Value Disclosure	225,000,000	225,000,000
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	225,000,000	225,000,000
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	225,000,000	225,000,000
Debt Instrument, Fair Value Disclosure	225,000,000	225,000,000
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	225,000,000	225,000,000
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Line of Credit	95,000,000	467,000,000
Lines of Credit, Fair Value Disclosure	95,000,000	467,000,000
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	0	0
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	95,000,000	467,000,000
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	0	0
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Line of Credit	95,000,000	467,000,000
Lines of Credit, Fair Value Disclosure	95,000,000	467,000,000
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	0	0
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	95,000,000	467,000,000
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lines of Credit, Fair Value Disclosure	0	0
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Installment Note Payable	860,000,000	860,000,000
Notes Payable, Fair Value Disclosure	906,000,000	845,000,000
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	0	0
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	906,000,000	845,000,000
Installment Note Payable [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	0	0
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Installment Note Payable	860,000,000	860,000,000
Notes Payable, Fair Value Disclosure	906,000,000	845,000,000
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	0	0
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	906,000,000	845,000,000
Installment Note Payable [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	0	0
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	892,000,000	916,000,000
Note Payable to Timberland Venture	783,000,000	783,000,000
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	0	0
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	$892,000,000	$916,000,000

Fair_Value_Measurements_Fair_V1

Fair Value Measurements Fair Value Assets and Liabilities Measured on a Non-Recurring Basis (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Basis Of Property After Impairment Recognition	$46	[1],[2]	$37	[3]	$4
Book Basis Of Property Before Impairment Recognition	53		41
Fair Value Of Certain Non Strategic Timberlands	46		37
Impairment Losses On Nonstrategic Timberlands	-7	[1],[2]	-4	[3]	0
Total Net Gain Loss On Assets Or Liabilities Measured At Fair Value On A Nonrecurring Basis	-7		-4
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Of Certain Non Strategic Timberlands	46	[1]	37	[3]
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Book Basis Of Property After Impairment Recognition	46	[4],[5]	37	[6]	4
Book Basis Of Property Before Impairment Recognition	53		41
Fair Value Of Certain Non Strategic Timberlands	46		37
Impairment Losses On Nonstrategic Timberlands	-7	[4],[5]	-4	[6]	0
Total Net Gain Loss On Assets Or Liabilities Measured At Fair Value On A Nonrecurring Basis	-7		-4
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Of Certain Non Strategic Timberlands	$46	[4]	$37	[6]
[1]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[2]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[3]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
[4]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[5]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[6]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.

Stockholders_Equity_Narratives

Stockholders' Equity (Narratives) (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Common Stock Shares Issued and Outstanding	175,900,000	177,000,000
Common Stock, Shares Authorized	300,634,566	300,600,000
Common Stock, par value	$0.01	$0.01
Excess Stock, Shares Authorized	150,000,001
Excess Stock, par value	$0.01
Preferred Stock, Shares Authorized	75,000,000	75,000,000
Preferred Stock, par value	$0.01	$0.01
Sale of Stock, Transaction Date		4-Nov-13
Issuance of Common Stock (Shares)		13,915,000
Proceeds from Issuance of Common Stock, net	$0	$607	$0
Debt Repayments from Equity Offering Proceeds		376
Remaining Authorized Amount Available for Share Repurchases	125
Acquisition Date		6-Dec-13
Installment Note Payable		860
Business Acquisition, Date of Acquisition Announcement		28-Oct-13
Proceeds From Hedge		5
Gain from Hedge		$5

Stockholders_Equity_Stockholde

Stockholders' Equity (Stockholders Equity) (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Shares of Common Stock	1.2
Total Cost of Shares	$50
Average Cost per Share	$40.21

Stockholders_Equity_Comprehens

Stockholders' Equity (Comprehensive Income) (Details) (USD $)	3 Months Ended									12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income										$214	$214	$203
PLUM CREEK TIMBER CO INC [Member]
Net Income	68	61	55	30	40	[1]	72	46	56	214	214	203
Unrealized Holding Gains (Losses), before Tax										1	5	2
Unrealized Holding Gains (Losses), Tax										0	0	0
Unrealized Holding Gains (Losses), Net of Tax										1	5	2
Actuarial Gain/(Loss), before Tax										-34	25	-2
Actuarial Gain/(Loss), Tax										-7	6	0
Actuarial Gain/(Loss), Net of Tax										-27	19	-2
Reclassification to Net Income for Actuarial Gains or Losses, before Tax										2	5	4
Reclassification to Net Income for Actuarial Gains or Losses, Tax										0	1	1
Reclassification to Net Income for Actuarial Gains or Losses, Net of Tax										2	4	3
Derivative Gain (Loss) on Cash Flow Hedge, before Tax										0	5	0
Derivative Gain (Loss) on Cash Flow Hedge, Tax											0
Derivative Gain (Loss) on Cash Flow Hedge, Net of Tax											5
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, before Tax										0	0	0
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, Tax										0
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, Net of Tax										0
Total Comprehensive Income										$190	$247	$206
[1]	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.

Stockholders_Equity_Components

Stockholders' Equity (Components of Accumulated Other Comprehensive Income Net of Tax) (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax	($23)		$1		($32)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-26		29
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2	[1]	4	[1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	14		13		8
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1		5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	-42		-17		-40
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-27		19
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2	[1]	4	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	5		5		0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0		5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$0		$0
[1]	Amortization of actuarial gains and losses on the company's defined benefit pension plans is included in the computation of pension cost. See Note 14 of the Notes to Consolidated Financial Statements.

Partners_Capital_Narrative_Det

Partners' Capital (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2008	Dec. 31, 2014	Dec. 31, 2012
PLUM CREEK TIMBERLANDS L P [Member]
Capital Contribution		$783
Capital Contributions from Parent Nonrecurring Transactions	607
Debt Repayments from Equity Offering Proceeds	376
Acquisition Date	6-Dec-13
Installment Note Payable	860
Business Acquisition, Date of Acquisition Announcement	28-Oct-13
Proceeds From Hedge	5
Gain from Hedge	5
PLUM CREEK TIMBER CO INC [Member]
Sale of Stock, Transaction Date	4-Nov-13
Note Payable to Timberland Venture	783		783
Issuance of Common Stock (Shares)	13,915,000
Proceeds from Issuance of Common Stock, net	607		0	0
Debt Repayments from Equity Offering Proceeds	376
Acquisition Date	6-Dec-13
Installment Note Payable	860
Business Acquisition, Date of Acquisition Announcement	28-Oct-13
Proceeds From Hedge	5
Gain from Hedge	5
PC Ventures [Member]
Note Payable to Timberland Venture		783
Series T-1 Preferred Interest Return per Annum		7.38%
Distributions for Series T-1 Preferred Interests		$58

Partners_Capital_Comprehensive

Partners' Capital (Comprehensive Income) (Details) (PLUM CREEK TIMBERLANDS L P [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBERLANDS L P [Member]
Net Income before Allocation to Series T-1 Preferred Interest and Partners	$272	$272	$261
Unrealized Holding Gains (Losses), before Tax	1	5	2
Unrealized Holding Gains (Losses), Tax	0	0	0
Unrealized Holding Gains (Losses), Net of Tax	1	5	2
Actuarial Gain/(Loss), before Tax	-34	25	-2
Actuarial Gain/(Loss), Tax	-7	6	0
Actuarial Gain/(Loss), Net of Tax	-27	19	-2
Reclassification to Net Income for Actuarial Gains or Losses, before Tax	2	5	4
Reclassification to Net Income for Actuarial Gains or Losses, Tax	0	1	1
Reclassification to Net Income for Actuarial Gains or Losses, Net of Tax	2	4	3
Derivative Gain (Loss) on Cash Flow Hedge, before Tax	0	5	0
Derivative Gain (Loss) on Cash Flow Hedge, Tax		0
Derivative Gain (Loss) on Cash Flow Hedge, Net of Tax		5
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, before Tax	0	0	0
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, Tax	0
Amortization of Gain (Loss) on Derivatives Reclassified to Interest Expense, Net of Tax	0
Total Comprehensive Income	$248	$305	$264

Partners_Capital_Components_of

Partners' Capital (Components of Accumulated Other Comprehensive Income Net of Tax) (Details) (PLUM CREEK TIMBERLANDS L P [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax	($23)		$1		($32)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-26		29
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2	[1]	4	[1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	14		13		8
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1		5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	-42		-17		-40
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-27		19
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2	[1]	4	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	5		5		0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0		5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$0		$0
[1]	Amortization of actuarial gains and losses on the Operating Partnershipbs defined benefit pension plans is included in the computation of pension cost. See Note 12 of the Notes to Consolidated Financial Statements.

Employee_Pension_and_Retiremen2

Employee Pension and Retirement Plans (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	H
	Year
PLUM CREEK TIMBER CO INC [Member]
Year of Service	1
Hours of Service, Minimum	1,000
Years of Service, Vesting	3
Contributed to the Qualified Pension Plan	$9	$0
Contributions to the Non-Qualified Pension Plan	1	0	0
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	4
Net Actuarial Loss (Gain)	54	22
Expected long-term rate of return on plan assets	7.25%	7.25%	7.50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%	100.00%	100.00%
Thrift and Profit Sharing Plan Expenses	5	4	4
PLUM CREEK TIMBERLANDS L P [Member]
Year of Service	1
Hours of Service, Minimum	1,000
Years of Service, Vesting	3
Contributed to the Qualified Pension Plan	9	0
Contributions to the Non-Qualified Pension Plan	1	0	0
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	4
Net Actuarial Loss (Gain)	54	22
Expected long-term rate of return on plan assets	7.25%	7.25%	7.50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%	100.00%	100.00%
Thrift and Profit Sharing Plan Expenses	5	4	4
Minimum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	35.00%
Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	35.00%
Maximum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Qualified Plan [Member] | Minimum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	4
Qualified Plan [Member] | Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	4
Qualified Plan [Member] | Maximum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	8
Qualified Plan [Member] | Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	8
Non-Qualified Plan [Member] | Minimum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1
Non-Qualified Plan [Member] | Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1
Non-Qualified Plan [Member] | Maximum [Member] | PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	4
Non-Qualified Plan [Member] | Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$4

Employee_Pension_and_Retiremen3

Employee Pension and Retirement Plans (Change in Benefit Obligation and Plan Assets) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Service Cost	$7	$7	$6
Interest Cost	8	8	8
Fair Value of Plan Assets at Beginning of Period	144
Employer Contributions	9	0
Fair Value of Plan Assets at End of Period	154	144
Funded Status-December 31	-64	-34
Noncurrent Assets	0	10
Current Liabilities	-5	-5
Noncurrent Liabilities	-59	-39
PLUM CREEK TIMBERLANDS L P [Member]
Service Cost	7	7	6
Interest Cost	8	8	8
Fair Value of Plan Assets at Beginning of Period	144
Employer Contributions	9	0
Fair Value of Plan Assets at End of Period	154	144
Funded Status-December 31	-64	-34
Noncurrent Assets	0	10
Current Liabilities	-5	-5
Noncurrent Liabilities	-59	-39
Change In Benefit Obligation [Member] | PLUM CREEK TIMBER CO INC [Member]
Benefit Obligation at Beginning of Period	178	181
Service Cost	7	7
Interest Cost	8	8
Actuarial (Gain) Loss	32	-12
Benefits Paid	-7	-6
Benefit Obligation at End of Period	218	178
Change In Benefit Obligation [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Benefit Obligation at Beginning of Period	178	181
Service Cost	7	7
Interest Cost	8	8
Actuarial (Gain) Loss	32	-12
Benefits Paid	-7	-6
Benefit Obligation at End of Period	218	178
Change In Fair Value Of Plan Assets [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value of Plan Assets at Beginning of Period	144	128
Actual Return on Plan Assets	7	22
Employer Contributions	10	0
Benefits Paid	-7	-6
Fair Value of Plan Assets at End of Period	154	144
Change In Fair Value Of Plan Assets [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value of Plan Assets at Beginning of Period	144	128
Actual Return on Plan Assets	7	22
Employer Contributions	10	0
Benefits Paid	-7	-6
Fair Value of Plan Assets at End of Period	$154	$144

Employee_Pension_and_Retiremen4

Employee Pension and Retirement Plans (Accumulated and Projected Benefit Obligations) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$154	$144
PLUM CREEK TIMBER CO INC [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation	164	134
Accumulated Benefit Obligation	154	126
Fair Value of Plan Assets	154	144
PLUM CREEK TIMBER CO INC [Member] | Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation	54	44
Accumulated Benefit Obligation	45	36
Assets Held in the Grantor Trust	43	40
PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	154	144
PLUM CREEK TIMBERLANDS L P [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation	164	134
Accumulated Benefit Obligation	154	126
Fair Value of Plan Assets	154	144
PLUM CREEK TIMBERLANDS L P [Member] | Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation	54	44
Accumulated Benefit Obligation	45	36
Assets Held in the Grantor Trust	$43	$40

Employee_Pension_and_Retiremen5

Employee Pension and Retirement Plans (Components of Pension Cost Recognized in Net Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Service Cost	$7	$7	$6
Interest Cost	8	8	8
Expected Return on Plan Assets	-9	-9	-7
Recognized Actuarial Loss	2	5	4
Total Pension Cost	8	11	11
PLUM CREEK TIMBERLANDS L P [Member]
Service Cost	7	7	6
Interest Cost	8	8	8
Expected Return on Plan Assets	-9	-9	-7
Recognized Actuarial Loss	2	5	4
Total Pension Cost	$8	$11	$11

Employee_Pension_and_Retiremen6

Employee Pension and Retirement Plans (Components of Pension Cost Recognized in Comprehensive Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Net Actuarial (Gain) Loss Recognized in Comprehensive Income	$34	($25)	$2
Amortization of the Net Actuarial Gain or Loss	-2	-5	-4
(Gain) Loss Recognized in Other Comprehensive Income	32	-30	-2
Combined Pension Cost Recognized in Comprehensive Income	40	-19	9
PLUM CREEK TIMBERLANDS L P [Member]
Net Actuarial (Gain) Loss Recognized in Comprehensive Income	34	-25	2
Amortization of the Net Actuarial Gain or Loss	-2	-5	-4
(Gain) Loss Recognized in Other Comprehensive Income	32	-30	-2
Combined Pension Cost Recognized in Comprehensive Income	$40	($19)	$9

Employee_Pension_and_Retiremen7

Employee Pension and Retirement Plans (Amounts Included in Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Net Actuarial Loss (Gain)	$54	$22
Deferred Tax Benefit	-13	-6
PLUM CREEK TIMBERLANDS L P [Member]
Net Actuarial Loss (Gain)	54	22
Deferred Tax Benefit	($13)	($6)

Employee_Pension_and_Retiremen8

Employee Pension and Retirement Plans (Weighted Average Assumption Used to Determine Benefit Obligations) (Details)	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Annuity Distributions	4.15%	5.05%
Lump-Sum Distributions	3.04%	3.80%
Rate of Compensation Increase	3.45%	3.45%
PLUM CREEK TIMBERLANDS L P [Member]
Annuity Distributions	4.15%	5.05%
Lump-Sum Distributions	3.04%	3.80%
Rate of Compensation Increase	3.45%	3.45%

Employee_Pension_and_Retiremen9

Employee Pension and Retirement Plans (Weighted Average Assumption Used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Discount Rate	5.05%	4.35%	4.95%
Expected Long-Term Return on Plan Assets	7.25%	7.25%	7.50%
Rate of Compensation Increase	3.45%	3.45%	3.45%
PLUM CREEK TIMBERLANDS L P [Member]
Discount Rate	5.05%	4.35%	4.95%
Expected Long-Term Return on Plan Assets	7.25%	7.25%	7.50%
Rate of Compensation Increase	3.45%	3.45%	3.45%

Recovered_Sheet1

Employee Pension and Retirement Plans (Target Allocations for the Various Asset Classes) (Details)	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Large Capitalization Domestic Equities	32.00%
Small and Mid-Size Capitalization Domestic Equities	7.00%
International Equities	26.00%
Fixed Income	35.00%
PLUM CREEK TIMBERLANDS L P [Member]
Large Capitalization Domestic Equities	32.00%
Small and Mid-Size Capitalization Domestic Equities	7.00%
International Equities	26.00%
Fixed Income	35.00%

Recovered_Sheet2

Employee Pension and Retirement Plans (Fair Values of Each Major Category of Plan Assets) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Total Investments Measured at Fair Value	$154	$144
PLUM CREEK TIMBER CO INC [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	1	0
PLUM CREEK TIMBER CO INC [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	16	16
PLUM CREEK TIMBER CO INC [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	11	11
PLUM CREEK TIMBER CO INC [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	40	38
PLUM CREEK TIMBER CO INC [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	40
PLUM CREEK TIMBER CO INC [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	34	32
PLUM CREEK TIMBER CO INC [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	7
PLUM CREEK TIMBER CO INC [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	36
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member]
Total Investments Measured at Fair Value	76	105
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	1	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	16	16
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	11	11
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	40	38
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	40
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member]
Total Investments Measured at Fair Value	78	39
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	34	32
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	7
PLUM CREEK TIMBER CO INC [Member] | Fair Value, Inputs, Level 2 [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	36
PLUM CREEK TIMBERLANDS L P [Member]
Total Investments Measured at Fair Value	154	144
PLUM CREEK TIMBERLANDS L P [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	1	0
PLUM CREEK TIMBERLANDS L P [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	16	16
PLUM CREEK TIMBERLANDS L P [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	11	11
PLUM CREEK TIMBERLANDS L P [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	40	38
PLUM CREEK TIMBERLANDS L P [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	40
PLUM CREEK TIMBERLANDS L P [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	34	32
PLUM CREEK TIMBERLANDS L P [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	7
PLUM CREEK TIMBERLANDS L P [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	36
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member]
Total Investments Measured at Fair Value	76	105
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	1	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	16	16
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	11	11
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	40	38
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	40
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1 Measurements) [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member]
Total Investments Measured at Fair Value	78	39
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Small and Mid Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, International Equity Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	0	0
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Collective Trust Funds, Large Cap Domestic Equity Securities [Member]
Total Investments Measured at Fair Value	34	32
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Collective Trust Funds, Fixed Income Securities [Member]
Total Investments Measured at Fair Value	8	7
PLUM CREEK TIMBERLANDS L P [Member] | Fair Value, Inputs, Level 2 [Member] | Limited Partnership Interest Fixed Income Securities [Member]
Total Investments Measured at Fair Value	$36

Recovered_Sheet3

Employee Pension and Retirement Plans (Future Benefit Payments Projected Based on the Same Assumptions Used to Measure the Benefit Obligation and Estimate Future Employee Service) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
2015	$17
2016	18
2017	27
2018	15
2019	16
2020 through 2024	78
PLUM CREEK TIMBERLANDS L P [Member]
2015	17
2016	18
2017	27
2018	15
2019	16
2020 through 2024	$78

ShareBased_Compensation_Plans_1

Share-Based Compensation Plans (Value Management Awards Activity) (Details) (Value Management Awards [Member])	12 Months Ended
	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Beginning Balance	256,133
Granted	145,080
Vested	-123,080
Forfeited	-6,975
Ending Balance	271,158
PLUM CREEK TIMBERLANDS L P [Member]
Beginning Balance	256,133
Granted	145,080
Vested	-123,080
Forfeited	-6,975
Ending Balance	271,158

ShareBased_Compensation_Plans_2

Share-Based Compensation Plans (Summary of Outstanding Value Management Awards) (Details) (USD $)	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Unrecognized Compensation Expense	$16
PLUM CREEK TIMBERLANDS L P [Member]
Unrecognized Compensation Expense	16
Performance Period 2012 to 2014 [Member] | PLUM CREEK TIMBER CO INC [Member]
Outstanding Units	120,280
Fair Value	0.3	[1]
Unrecognized Compensation Expense	0
Maximum Award Value	24.1	[2]
Performance Period 2012 to 2014 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Outstanding Units	120,280
Fair Value	0.3	[1]
Unrecognized Compensation Expense	0
Maximum Award Value	24.1	[2]
Performance Period 2013 to 2015 [Member] | PLUM CREEK TIMBER CO INC [Member]
Outstanding Units	129,203
Fair Value	2.5	[1]
Unrecognized Compensation Expense	0.8
Maximum Award Value	25.8	[2]
Performance Period 2013 to 2015 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Outstanding Units	129,203
Fair Value	2.5	[1]
Unrecognized Compensation Expense	0.8
Maximum Award Value	25.8	[2]
Performance Period 2014 to 2016 [Member] | PLUM CREEK TIMBER CO INC [Member]
Outstanding Units	141,955
Fair Value	6.3	[1]
Unrecognized Compensation Expense	4
Maximum Award Value	28.4	[2]
Performance Period 2014 to 2016 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Outstanding Units	141,955
Fair Value	6.3	[1]
Unrecognized Compensation Expense	4
Maximum Award Value	$28.40	[2]
[1]	The estimated fair value includes unrecognized compensation expense.
[2]	Maximum award value is based on a unit value of $200.

ShareBased_Compensation_Plans_3

Share-Based Compensation Plans (Summary of Earned and Paid Value Management Awards for Three Year Periods) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Performance Period 2012 to 2014 [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	3
Total Payout (millions)	$0.30
Payment Date	1st Quarter 2015
Performance Period 2012 to 2014 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	3
Total Payout (millions)	0.3
Payment Date	1st Quarter 2015
Performance Period 2011 to 2013 [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	35
Total Payout (millions)	2.7
Payment Date	1st Quarter 2014
Performance Period 2011 to 2013 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	35
Total Payout (millions)	2.7
Payment Date	1st Quarter 2014
Performance Period 2010 to 2012 [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	0
Total Payout (millions)	0
Payment Date	Not Earned
Performance Period 2010 to 2012 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	0
Total Payout (millions)	0
Payment Date	Not Earned
Performance Period 2009 to 2011 [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	0
Total Payout (millions)	0
Payment Date	Not Earned
Performance Period 2009 to 2011 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	0
Total Payout (millions)	$0
Payment Date	Not Earned

ShareBased_Compensation_Plans_4

Share-Based Compensation Plans Share-Based Compensation Plans (Restricted Stock Units) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
PLUM CREEK TIMBER CO INC [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Beginning Balance	366,133
Beginning Balance Weighted- Average Grant Date Fair Value	$43.35
Granted	228,765
Granted Weighted- Average Grant Date Fair Value	$42.04	$47.93	$39
Vested	-133,236
Vested Weighted- Average Grant Date Fair Value	$41.71
Forfeited	-48,090
Forfeited Weighted- Average Grant Date Fair Value	$42.12
Ending Balance	413,572	366,133
Ending Balance Weighted- Average Grant Date Fair Value	$43.30	$43.35
PLUM CREEK TIMBERLANDS L P [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
PLUM CREEK TIMBERLANDS L P [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Beginning Balance	366,133
Beginning Balance Weighted- Average Grant Date Fair Value	$43.35
Granted	228,765
Granted Weighted- Average Grant Date Fair Value	$42.04	$47.93	$39
Vested	-133,236
Vested Weighted- Average Grant Date Fair Value	$41.71
Forfeited	-48,090
Forfeited Weighted- Average Grant Date Fair Value	$42.12
Ending Balance	413,572	366,133
Ending Balance Weighted- Average Grant Date Fair Value	$43.30	$43.35

ShareBased_Compensation_Plans_5

Share-Based Compensation Plans Share-Based Compensation Plans (Stock Option Activity) (Details) (Stock Options [Member], USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding at Beginning of Year	1,928,961
Weighted Average Exercise Price for Stock Options Outstanding at Beginning of Year	$38.47
Granted Shares Subject to Options	0
Granted Weighted- Average Exercise Price	$0
Exercised/Surrendered Shares Subject to Options	-70,425
Exercised/Surrendered Weighted- Average Exercise Price	$35.54
Cancelled/Forfeited Shares Subject to Options	-12,238
Cancelled/Forfeited Weighted-Average Exercise Price	$36.36
Stock Options Outstanding at End of Year	1,846,298
Weighted Average Exercise Price for Stock Options Outstanding at End of Year	$38.59
Outstanding, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Outstanding, Aggregate Intrinsic Value (Millions)	$8
Vested or Expected to Vest, Shares Subject to Options	1,846,298
Vested or Expected to Vest, Weighted- Average Exercise Price	$38.59
Vested or Expected to Vest, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Vested or Expected to Vest, Aggregate Intrinsic Value (Millions)	8
Exercisable, Shares Subject to Options	1,713,696
Exercisable, Weighted- Average Exercise Price	$38.37
Exercisable, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Exercisable, Aggregate Intrinsic Value (Millions)	8
PLUM CREEK TIMBERLANDS L P [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding at Beginning of Year	1,928,961
Weighted Average Exercise Price for Stock Options Outstanding at Beginning of Year	$38.47
Granted Shares Subject to Options	0
Granted Weighted- Average Exercise Price	$0
Exercised/Surrendered Shares Subject to Options	-70,425
Exercised/Surrendered Weighted- Average Exercise Price	$35.54
Cancelled/Forfeited Shares Subject to Options	-12,238
Cancelled/Forfeited Weighted-Average Exercise Price	$36.36
Stock Options Outstanding at End of Year	1,846,298
Weighted Average Exercise Price for Stock Options Outstanding at End of Year	$38.59
Outstanding, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Outstanding, Aggregate Intrinsic Value (Millions)	8
Vested or Expected to Vest, Shares Subject to Options	1,846,298
Vested or Expected to Vest, Weighted- Average Exercise Price	$38.59
Vested or Expected to Vest, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Vested or Expected to Vest, Aggregate Intrinsic Value (Millions)	8
Exercisable, Shares Subject to Options	1,713,696
Exercisable, Weighted- Average Exercise Price	$38.37
Exercisable, Weighted- Average Remaining Contractual Life (Years)	4 years 0 months
Exercisable, Aggregate Intrinsic Value (Millions)	$8

ShareBased_Compensation_Plans_6

Share-Based Compensation Plans (Schedule of Stock Activity Related to Stock Options Exercised During the Period) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Proceeds from Stock Options Exercised	$3	$37	$18
Equity Option [Member] | PLUM CREEK TIMBER CO INC [Member]
Proceeds from Stock Options Exercised	3	37	18
Intrinsic Value of Stock Options Exercised	1	12	6
Tax Benefit Related to Stock Options Exercised	0	2	1
Equity Option [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Proceeds from Stock Options Exercised	3	37	18
Intrinsic Value of Stock Options Exercised	1	12	6
Tax Benefit Related to Stock Options Exercised	$0	$2	$1

ShareBased_Compensation_Plans_7

Share-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Shares of common stock reserved and eligible for issuance	6,100,000
Shares of common stock used during the period	600,000
Shares of common stock remain available for grants	5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Unrecognized Compensation Expense	$16,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
PLUM CREEK TIMBERLANDS L P [Member]
Shares of common stock reserved and eligible for issuance	6,100,000
Shares of common stock used during the period	600,000
Shares of common stock remain available for grants	5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Unrecognized Compensation Expense	16,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock Units (RSUs) [Member] | PLUM CREEK TIMBER CO INC [Member]
Weighted-Average Grant Date Fair Value	$42.04	$47.93	$39
Fair value of restricted stock vested during the period	6,000,000	5,000,000	4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	228,765
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Restricted Stock Units (RSUs) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Weighted-Average Grant Date Fair Value	$42.04	$47.93	$39
Fair value of restricted stock vested during the period	6,000,000	5,000,000	4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	228,765
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Common Stock Awards [Member] | PLUM CREEK TIMBER CO INC [Member]
Weighted-Average Grant Date Fair Value	$42.14	$48.47	$38.93
Fair value of restricted stock vested during the period	1,000,000	1,000,000	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,053
Common Stock Awards [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Weighted-Average Grant Date Fair Value	$42.14	$48.47	$38.93
Fair value of restricted stock vested during the period	1,000,000	1,000,000	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,053
Equity Option [Member] | PLUM CREEK TIMBER CO INC [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Term of Stock Options	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Equity Option [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Term of Stock Options	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Value Management Awards [Member] | PLUM CREEK TIMBER CO INC [Member]
Value Management Award Unit Face Value	100
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Value Management Awards [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Value Management Award Unit Face Value	$100
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Minimum [Member] | Value Management Awards [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	0
Minimum [Member] | Value Management Awards [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	0
Maximum [Member] | Value Management Awards [Member] | PLUM CREEK TIMBER CO INC [Member]
Payout Value per Unit	200
Maximum [Member] | Value Management Awards [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payout Value per Unit	200

ShareBased_Compensation_Plans_8

Share-Based Compensation Plans Share-Based Compensation Expense (Compensation Expense and Recognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Share-based Compensation Expense and Recognized Tax Benefits [Line Items]
Share-based Compensation Expense	$6	$13	$13
Recognized Tax Benefits	1	2	2
PLUM CREEK TIMBERLANDS L P [Member]
Share-based Compensation Expense and Recognized Tax Benefits [Line Items]
Share-based Compensation Expense	6	13	13
Recognized Tax Benefits	$1	$2	$2

Detail_of_Certain_Balance_Shee2

Detail of Certain Balance Sheet Accounts (Schedule of Details of Certain Balance Sheet Accounts)(Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Expense, Current	$8	$7
Taxes Receivable	4	3
Notes Receivable	0	3
Deposits, Current	2	2
Real Estate Inventory Land and Land Development Cost, Current	1	0
Total Other Current Assets	15	15
Other Assets, Noncurrent [Abstract]
Real Estate Inventory Land and Land Development Costs	12	13
Unamortized Debt Issue Costs	7	8
Deposits	8	8
Qualified Pension Asset	0	10
Intangible Assets	14	15
Other Assets, Noncurrent	4	0
Total Other Non-Current Assets	45	54
Other Liabilities, Current [Abstract]
Long-Term Incentive Compensation	0	3
Accrued Pension Liability	5	5
Workers' Compensation Liability, Current	1	1
Other Liabilities, Current	4	1
Total Other Current Liabilities	10	10
Other Liabilities, Noncurrent [Abstract]
Timber Obligations	5	5
Deferred Compensation	5	5
Long-Term Incentive Compensation	4	8
Accrued Pension Liability	59	39
Deferred Revenue	12	7
Workers' Compensation	7	9
Other Liabilities, Noncurrent	8	5
Total Other Non-Current Liabilities	100	78
PLUM CREEK TIMBERLANDS L P [Member]
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Expense, Current	8	7
Taxes Receivable	4	3
Notes Receivable	0	3
Deposits, Current	2	2
Real Estate Inventory Land and Land Development Cost, Current	1	0
Total Other Current Assets	15	15
Other Assets, Noncurrent [Abstract]
Real Estate Inventory Land and Land Development Costs	12	13
Unamortized Debt Issue Costs	7	8
Deposits	8	8
Qualified Pension Asset	0	10
Intangible Assets	14	15
Other Assets, Noncurrent	4	0
Total Other Non-Current Assets	45	54
Other Liabilities, Current [Abstract]
Long-Term Incentive Compensation	0	3
Accrued Pension Liability	5	5
Workers' Compensation Liability, Current	1	1
Other Liabilities, Current	4	1
Total Other Current Liabilities	10	10
Other Liabilities, Noncurrent [Abstract]
Timber Obligations	5	5
Deferred Compensation	6	6
Long-Term Incentive Compensation	4	8
Accrued Pension Liability	59	39
Deferred Revenue	12	7
Workers' Compensation	7	9
Other Liabilities, Noncurrent	8	5
Total Other Non-Current Liabilities	$101	$79

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss	$2	$0	$0
Insurance Recoveries	13	1	0
Net Gain on MDF Insurance Recoveries	11
Estimated Future Insurance Recoveries	2
Operating lease expense	4	4	3
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4			4
Timber Obligations, Future Minimum Payments Due, Next Twelve Months	1			1
Operating Leases, Future Minimum Payments, Due in Two Years	4			4
Timber Obligations, Future Minimum Payments Due in Two Years	0			0
Operating Leases, Future Minimum Payments, Due in Three Years	4			4
Timber Obligations, Future Minimum Payments Due in Three Years	0			0
Operating Leases, Future Minimum Payments, Due in Four Years	4			4
Timber Obligations, Future Minimum Payments Due in Four Years	0			0
Operating Leases, Future Minimum Payments, Due in Five Years	3			3
Timber Obligations, Future Minimum Payments Due in Five Years	0			0
Operating Leases, Future Minimum Payments, Due Thereafter	12			12
Timber Obligations, Future Minimum Payments Due Thereafter	4			4
Operating Leases, Future Minimum Payments Due	31			31
Timber Obligations, Future Minimum Payments Due	5			5
PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss	2	0	0
Insurance Recoveries	13	1	0
Net Gain on MDF Insurance Recoveries	11
Estimated Future Insurance Recoveries	2
Operating lease expense	4	4	3
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4			4
Timber Obligations, Future Minimum Payments Due, Next Twelve Months	1			1
Operating Leases, Future Minimum Payments, Due in Two Years	4			4
Timber Obligations, Future Minimum Payments Due in Two Years	0			0
Operating Leases, Future Minimum Payments, Due in Three Years	4			4
Timber Obligations, Future Minimum Payments Due in Three Years	0			0
Operating Leases, Future Minimum Payments, Due in Four Years	4			4
Timber Obligations, Future Minimum Payments Due in Four Years	0			0
Operating Leases, Future Minimum Payments, Due in Five Years	3			3
Timber Obligations, Future Minimum Payments Due in Five Years	0			0
Operating Leases, Future Minimum Payments, Due Thereafter	12			12
Timber Obligations, Future Minimum Payments Due Thereafter	4			4
Operating Leases, Future Minimum Payments Due	31			31
Timber Obligations, Future Minimum Payments Due	5			5
Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss	2
Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss	2
Manufacturing [Member] | Building and Equipment Repair and Replacement Insurance Recoveries [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	10
Manufacturing [Member] | Building and Equipment Repair and Replacement Insurance Recoveries [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	10
Manufacturing [Member] | Business Interruption Insurance Recoveries [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	3
Manufacturing [Member] | Business Interruption Insurance Recoveries [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	3
Manufacturing [Member] | Total Insurance Recoveries [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	13			4	5	4
Manufacturing [Member] | Total Insurance Recoveries [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	$13			$4	$5	$4

Equity_Method_Investment_Narra

Equity Method Investment (Narrative)(Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008	Dec. 06, 2013
	acre
PLUM CREEK TIMBER CO INC [Member]
Acquisition Date		6-Dec-13
Land With Development Potential (Acres)	75,000
Total Purchase Price		$1,100,000,000
Equity Method Investments	126,000,000	139,000,000			139,000,000
Earnings from Unconsolidated Entities	66,000,000	63,000,000	59,000,000
Amount borrowed from the Timberland Venture	783,000,000	783,000,000
PLUM CREEK TIMBERLANDS L P [Member]
Acquisition Date		6-Dec-13
Land With Development Potential (Acres)	75,000
Total Purchase Price		1,100,000,000
Equity Method Investments	126,000,000	139,000,000			139,000,000
Earnings from Unconsolidated Entities	66,000,000	63,000,000	59,000,000
Proceeds from Partnership Contribution				783,000,000
PC Ventures [Member]
Amount borrowed from the Timberland Venture				783,000,000
Stated Interest Rate				7.38%
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Payments to Acquire Equity Method Investments		12,000,000
Common Interest, Ownership Percentage	4.00%				5.00%
Land With Development Potential (Acres)	22,000				22,000
Equity Method Investment Agreed Upon Value					252,000,000
Other Partnership Ownership Percentage					95.00%
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payments to Acquire Equity Method Investments		12,000,000
Common Interest, Ownership Percentage	4.00%				5.00%
Land With Development Potential (Acres)	22,000				22,000
Equity Method Investment Agreed Upon Value					252,000,000
Other Partnership Ownership Percentage					95.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Payments to Acquire Equity Method Investments		140,000,000
Common Interest, Ownership Percentage	50.00%				50.00%
Land With Development Potential (Acres)	71,000				87,000
Equity Method Investment Agreed Upon Value					279,000,000
Other Partnership Ownership Percentage					50.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payments to Acquire Equity Method Investments		140,000,000
Common Interest, Ownership Percentage	50.00%				50.00%
Land With Development Potential (Acres)	71,000				87,000
Equity Method Investment Agreed Upon Value					279,000,000
Other Partnership Ownership Percentage					50.00%
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Payments to Acquire Equity Method Investments		152,000,000
Equity Method Investment Agreed Upon Value					531,000,000
Equity Method Investments					139,000,000
Equity Method Investment, Underlying Equity in Net Assets					52,000,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity					87,000,000
Earnings from Unconsolidated Entities	3,000,000	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payments to Acquire Equity Method Investments		152,000,000
Equity Method Investment Agreed Upon Value					531,000,000
Equity Method Investments					139,000,000
Equity Method Investment, Underlying Equity in Net Assets					52,000,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity					87,000,000
Earnings from Unconsolidated Entities	3,000,000	0	0
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Common Interest, Ownership Percentage				9.00%
Equity Method Investment, Underlying Equity in Net Assets				783,000,000
Earnings from Unconsolidated Entities	63,000,000	63,000,000	59,000,000
Contributed Acres Of Timberlands To Venture				454,000
Preferred Interest in Venture				705,000,000
Common Interest in Venture				78,000,000
Proceeds from Partnership Contribution				783,000,000
Other Partnership Ownership Percentage				91.00%
Book Basis of Timberlands Contributed				174,000,000
Capitalized Costs in Connection with Transfer				9,000,000
Fair Value of Timberlands Contributed				783,000,000
Difference Between Carrying Amount and Underlying Equity Allocated to Standing Timber				289,000,000
Difference Between Carrying Amount and Underlying Equity Allocated to Land				320,000,000
Accumulated Amortization of Basis Difference	49,000,000
Cumulative Shortfall in Allocated Equity Earnings	28,000,000
Undistributed Earnings from Equity Method Investees	33,000,000	27,000,000
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Common Interest, Ownership Percentage				9.00%
Equity Method Investment, Underlying Equity in Net Assets				783,000,000
Earnings from Unconsolidated Entities	63,000,000	63,000,000	59,000,000
Contributed Acres Of Timberlands To Venture				454,000
Preferred Interest in Venture				705,000,000
Common Interest in Venture				78,000,000
Proceeds from Partnership Contribution				783,000,000
Other Partnership Ownership Percentage				91.00%
Book Basis of Timberlands Contributed				174,000,000
Capitalized Costs in Connection with Transfer				9,000,000
Fair Value of Timberlands Contributed				783,000,000
Difference Between Carrying Amount and Underlying Equity Allocated to Standing Timber				289,000,000
Difference Between Carrying Amount and Underlying Equity Allocated to Land				320,000,000
Accumulated Amortization of Basis Difference	49,000,000
Cumulative Shortfall in Allocated Equity Earnings	28,000,000
Undistributed Earnings from Equity Method Investees	33,000,000	27,000,000
Preferred Interest [Member] | PLUM CREEK TIMBER CO INC [Member]
Annual Preferred Interest Return				7.88%
Approximate Amount Of Cumulative Preferred Return Per Annum				56,000,000
Preferred Interest [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Annual Preferred Interest Return				7.88%
Approximate Amount Of Cumulative Preferred Return Per Annum				56,000,000
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Amount borrowed from the Timberland Venture	783,000,000			783,000,000
Stated Interest Rate	7.38%			7.38%
Interest Expense Related to the Note				$58,000,000

Timberland_Venture_Equity_Meth

Timberland Venture - Equity Method Investment (Equity Earnings for the Timberland Venture) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings from Timberland Venture	$66	$63	$59
Distributions from Timberland Venture	57	56	56
PLUM CREEK TIMBER CO INC [Member] | Timberland Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings From Preferred Interest	54	53	51
Equity Earnings From Common Interest	0	0	0
Amortization Of Basis Difference	9	10	8
Equity Earnings from Timberland Venture	63	63	59
Preferred Interest Distributions	56	55	56
Common Interest Distributions	1	1	0
Distributions from Timberland Venture	57	56	56
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings from Timberland Venture	66	63	59
Distributions from Timberland Venture	57	56	56
PLUM CREEK TIMBERLANDS L P [Member] | Timberland Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Earnings From Preferred Interest	54	53	51
Equity Earnings From Common Interest	0	0	0
Amortization Of Basis Difference	9	10	8
Equity Earnings from Timberland Venture	63	63	59
Preferred Interest Distributions	56	55	56
Common Interest Distributions	1	1	0
Distributions from Timberland Venture	$57	$56	$56

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 06, 2013	Dec. 31, 2008
	acre
PLUM CREEK TIMBER CO INC [Member]
Land With Development Potential (Acres)	75,000
Contributions to Real Estate Development Ventures	$9	$0	$0
Equity Investment in Real Estate Development Ventures	126	139		139
Equity Investment in Timberland Venture	217	211
PLUM CREEK TIMBERLANDS L P [Member]
Land With Development Potential (Acres)	75,000
Contributions to Real Estate Development Ventures	9	0	0
Equity Investment in Real Estate Development Ventures	126	139		139
Equity Investment in Timberland Venture	217	211
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Land With Development Potential (Acres)	22,000			22,000
Payments to Acquire Equity Method Investments		12
Common Interest, Ownership Percentage	4.00%			5.00%
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Land With Development Potential (Acres)	22,000			22,000
Payments to Acquire Equity Method Investments		12
Common Interest, Ownership Percentage	4.00%			5.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity Financial or Other Support Years	6 years
Land With Development Potential (Acres)	71,000			87,000
Variable Interest Entity, Financial or Other Support, Amount	39
Payments to Acquire Equity Method Investments		140
Contributions to Real Estate Development Ventures	9
Common Interest, Ownership Percentage	50.00%			50.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity Financial or Other Support Years	6 years
Land With Development Potential (Acres)	71,000			87,000
Variable Interest Entity, Financial or Other Support, Amount	39
Payments to Acquire Equity Method Investments		140
Contributions to Real Estate Development Ventures	9
Common Interest, Ownership Percentage	50.00%			50.00%
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Payments to Acquire Equity Method Investments		152
Equity Investment in Real Estate Development Ventures				139
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Payments to Acquire Equity Method Investments		152
Equity Investment in Real Estate Development Ventures				139
MWV-CLP [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBER CO INC [Member]
Maximum exposure to loss	126
MWV-CLP [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Maximum exposure to loss	126
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Common Interest, Ownership Percentage					9.00%
Preferred Interest in Venture					705
Total Common Interests in Venture	861
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Common Interest, Ownership Percentage					9.00%
Preferred Interest in Venture					705
Total Common Interests in Venture	861
Timberland Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBER CO INC [Member]
Maximum exposure to loss	217
Timberland Venture [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Maximum exposure to loss	$217

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2008	Dec. 31, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Amount borrowed from the Timberland Venture		$783	$783
PLUM CREEK TIMBERLANDS L P [Member]
Proceeds from Partnership Contribution	783
PC Ventures [Member]
Amount borrowed from the Timberland Venture	783
Note Payable Interest rate	7.38%
Note Payable to Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Amount borrowed from the Timberland Venture	$783	$783
Note Payable Interest rate	7.38%	7.38%

Related_Party_Transactions_Equ

Related Party Transactions (Equity Earnings and Distribution) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Equity Earnings from Timberland Venture	$66	$63	$59
Distributions from Timberland Venture	57	56	56
PLUM CREEK TIMBERLANDS L P [Member]
Equity Earnings from Timberland Venture	66	63	59
Distributions from Timberland Venture	57	56	56
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Equity Earnings from Timberland Venture	63	63	59
Distributions from Timberland Venture	57	56	56
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Equity Earnings from Timberland Venture	63	63	59
Distributions from Timberland Venture	$57	$56	$56

Related_Party_Transactions_Not

Related Party Transactions (Notes Payable) (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Interest Expense, Related Party	$58	$58	$58
Interest Payments to Related Party	$58	$58	$58

Related_Party_Transactions_Cas

Related Party Transactions (Cash Distribution) (Details) (PLUM CREEK TIMBERLANDS L P [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBERLANDS L P [Member]
Cash payments related to Series T-1 Redeemable Preferred Partnership Interest	$58	$58	$58

Related_Party_Transactions_Rel

Related Party Transactions Related Party Transactions (Interest Payable) (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
PLUM CREEK TIMBER CO INC [Member]
Related Party Interest Payable Current	$7	$7

Segment_Information_Revenues_F

Segment Information (Revenues From Manufactured Products by Product Line) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Revenues	$428	$375	$356	$317	$331	$366	$303	$340	$1,476	$1,340	$1,339
Manufacturing Revenue									368	362	324
PLUM CREEK TIMBERLANDS L P [Member]
Revenues	428	375	356	317	331	366	303	340	1,476	1,340	1,339
Manufacturing Revenue									368	362	324
Lumber [Member] | PLUM CREEK TIMBER CO INC [Member]
Revenues									109	95	78
Lumber [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Revenues									109	95	78
Plywood [Member] | PLUM CREEK TIMBER CO INC [Member]
Revenues									87	92	91
Plywood [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Revenues									87	92	91
MDF [Member] | PLUM CREEK TIMBER CO INC [Member]
Revenues									172	175	155
MDF [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Revenues									$172	$175	$155

Segment_Information_Summary_of

Segment Information (Summary of Reported Segments) (Details) (USD $)	3 Months Ended												12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
External Revenues	$428		$375		$356		$317		$331	$366	$303	$340	$1,476		$1,340		$1,339
Depreciation, Depletion and Amortization													138		119		114
Basis of Real Estate Sold													129		91		138
Earnings from Unconsolidated Entities													66		63		59
Operating Income (Loss)	92	[1]	91	[1]	82	[1]	57	[1]	64	91	62	78	322		295		281
PLUM CREEK TIMBERLANDS L P [Member]
External Revenues	428		375		356		317		331	366	303	340	1,476		1,340		1,339
Depreciation, Depletion and Amortization													138		119		114
Basis of Real Estate Sold													129		91		138
Earnings from Unconsolidated Entities													66		63		59
Operating Income (Loss)	92	[2]	91	[2]	82	[2]	57	[2]	64	91	62	78	322		295		281
Northern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													236		234		224
Intersegment Revenues													28		26		22
Export Revenues													10		15		19
Depreciation, Depletion and Amortization													28		30	[3]	26
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													44		32		20
Northern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													236		234		224
Intersegment Revenues													28		26		22
Export Revenues													10		15		19
Depreciation, Depletion and Amortization													28		30	[3]	26
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													44		32		20
Southern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													531		435		417
Intersegment Revenues													0		0		0
Export Revenues													9		6		2
Depreciation, Depletion and Amortization													82		65		67
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													137		108		90
Southern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													531		435		417
Intersegment Revenues													0		0		0
Export Revenues													9		6		2
Depreciation, Depletion and Amortization													82		65		67
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													137		108		90
Real Estate [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													289		286		352
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													1		1		1
Basis of Real Estate Sold													129		91		138
Other Operating Gain													0		0		0
Operating Income (Loss)													133	[4]	169	[4]	187	[4]
Real Estate [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													289		286		352
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													1		1		1
Basis of Real Estate Sold													129		91		138
Other Operating Gain													0		0		0
Operating Income (Loss)													133	[5]	169	[5]	187	[5]
Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													368		362		324
Intersegment Revenues													0		0		0
Export Revenues													28		29		32
Depreciation, Depletion and Amortization													14		16		15
Basis of Real Estate Sold													0		0		0
Other Operating Gain													11	[6]	0		0
Operating Income (Loss)													49		43		29
Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													368		362		324
Intersegment Revenues													0		0		0
Export Revenues													28		29		32
Depreciation, Depletion and Amortization													14		16		15
Basis of Real Estate Sold													0		0		0
Other Operating Gain													11	[7]	0		0
Operating Income (Loss)													49		43		29
Energy and Natural Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													34		23		22
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													8		3		1
Basis of Real Estate Sold													0		0		0
Other Operating Gain													2	[8]	1	[8]	0
Operating Income (Loss)													25		19		19
Energy and Natural Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													34		23		22
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													8		3		1
Basis of Real Estate Sold													0		0		0
Other Operating Gain													2	[9]	1	[9]	0
Operating Income (Loss)													25		19		19
Other Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													18		0		0
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													0		0		0
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													2		0		0
Other Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													18		0		0
Intersegment Revenues													0		0		0
Export Revenues													0		0		0
Depreciation, Depletion and Amortization													0		0		0
Basis of Real Estate Sold													0		0		0
Other Operating Gain													0		0		0
Operating Income (Loss)													2		0		0
Operating Segments [Member] | PLUM CREEK TIMBER CO INC [Member]
External Revenues													1,476		1,340		1,339
Intersegment Revenues													28		26		22
Export Revenues													47		50		53
Depreciation, Depletion and Amortization													133	[10]	115	[10],[3]	110	[10]
Basis of Real Estate Sold													129		91		138
Other Operating Gain													13	[6],[8]	1	[8]	0
Operating Income (Loss)													390	[4]	371	[4]	345	[4]
Operating Segments [Member] | PLUM CREEK TIMBERLANDS L P [Member]
External Revenues													1,476		1,340		1,339
Intersegment Revenues													28		26		22
Export Revenues													47		50		53
Depreciation, Depletion and Amortization													133	[10]	115	[10],[3]	110	[10]
Basis of Real Estate Sold													129		91		138
Other Operating Gain													13	[7],[9]	1	[9]	0
Operating Income (Loss)													390	[5]	371	[5]	345	[5]
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													3		0		0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													3		0		0
MWV-CLP [Member] | Northern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Northern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Southern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Southern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Real Estate [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Real Estate [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Energy and Natural Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Energy and Natural Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													0		0		0
MWV-CLP [Member] | Other Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													3	[11]	0		0
MWV-CLP [Member] | Other Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													3	[11]	0		0
MWV-CLP [Member] | Operating Segments [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													3	[11]	0		0
MWV-CLP [Member] | Operating Segments [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													$3	[11]	$0		$0
[1]	During the second quarter of 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 21 of the Notes to Consolidated Financial Statements.
[2]	During the second quarter of 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 19 of the Notes to Consolidated Financial Statements.
[3]	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
[4]	The company recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 5 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
[5]	The Operating Partnership recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 4 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
[6]	During 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[7]	During 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[8]	During 2014, the company agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the company sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[9]	During 2014, the Operating Partnership agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the Operating Partnership sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[10]	Consolidated depreciation, depletion and amortization includes unallocated corporate depreciation of $3 million, $4 million, and $4 million for 2014, 2013 and 2012, respectively.
[11]	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.

Segment_Information_Reconcilia

Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Income Before Income Taxes) (Details) (USD $)	3 Months Ended												12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
PLUM CREEK TIMBER CO INC [Member]
Operating Income (Loss)	$92	[1]	$91	[1]	$82	[1]	$57	[1]	$64	$91	$62	$78	$322		$295		$281
Earnings from Unconsolidated Entities													66		63		59
Total Interest Expense, net													-166		-141		-140
Loss on Extinguishment of Debt													0		-4		0
Income before Income Taxes													222		213		200
PLUM CREEK TIMBERLANDS L P [Member]
Operating Income (Loss)	92	[2]	91	[2]	82	[2]	57	[2]	64	91	62	78	322		295		281
Earnings from Unconsolidated Entities													66		63		59
Total Interest Expense, net													-108		-83		-82
Loss on Extinguishment of Debt													0		-4		0
Income before Income Taxes													280		271		258
Operating Segments [Member] | PLUM CREEK TIMBER CO INC [Member]
Operating Income (Loss)													390	[3]	371	[3]	345	[3]
Operating Segments [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Operating Income (Loss)													390	[4]	371	[4]	345	[4]
Segment Reconciling Items [Member] | PLUM CREEK TIMBER CO INC [Member]
Operating Income (Loss)													-67		-73		-65
Segment Reconciling Items [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Operating Income (Loss)													-67		-73		-65
Other Unallocated Operating Income Expense Net [Member] | PLUM CREEK TIMBER CO INC [Member]
Operating Income (Loss)													2		-3		1
Other Unallocated Operating Income Expense Net [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Operating Income (Loss)													2		-3		1
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities													63		63		59
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities													$63		$63		$59
[1]	During the second quarter of 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 21 of the Notes to Consolidated Financial Statements.
[2]	During the second quarter of 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 19 of the Notes to Consolidated Financial Statements.
[3]	The company recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 5 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.
[4]	The Operating Partnership recognized impairment losses on sales of timberlands expected to close within a twelve-month period of $7 million in 2014, $4 million in 2013 and less than $1 million in 2012. The transaction related to the 2014 impairment loss closed in December 2014 (see Note 4 of the Notes to Consolidated Financial Statements). Impairments are recognized as part of Cost of Goods Sold and reflected as part of Operating Income.

Segment_Information_Narrative_

Segment Information (Narrative) (Details) (USD $)	12 Months Ended					3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
	acre
PLUM CREEK TIMBER CO INC [Member]
Timber And Timberlands Acres Owned	6,600,000					6,600,000
Higher Value Timberlands Which Are Expected To Be Sold And Or Developed Acres	775,000					775,000
Land Expect To Sell For Recreational Uses	500,000					500,000
Land Expect To Sell For Conservation In Acres	200,000					200,000
Land With Development Potential (Acres)	75,000					75,000
Non Strategic Timberlands Which Are Expected To Be Sold Acres	225,000					225,000
Loss Related to Forest Fires			$4
Impairment Losses	7	[1],[2]	4	[3]	0
MDF Fire Impairment Loss	2		0		0
Insurance Recoveries	13		1		0
Earnings from Unconsolidated Entities	66		63		59
Depreciation, Depletion and Amortization	138		119		114
PLUM CREEK TIMBERLANDS L P [Member]
Timber And Timberlands Acres Owned	6,600,000					6,600,000
Higher Value Timberlands Which Are Expected To Be Sold And Or Developed Acres	775,000					775,000
Land Expect To Sell For Recreational Uses	500,000					500,000
Land Expect To Sell For Conservation In Acres	200,000					200,000
Land With Development Potential (Acres)	75,000					75,000
Non Strategic Timberlands Which Are Expected To Be Sold Acres	225,000					225,000
Loss Related to Forest Fires			4
Impairment Losses	7	[4],[5]	4	[6]	0
MDF Fire Impairment Loss	2		0		0
Insurance Recoveries	13		1		0
Earnings from Unconsolidated Entities	66		63		59
Depreciation, Depletion and Amortization	138		119		114
Northern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Loss Related to Forest Fires			4
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	28		30	[7]	26
Northern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Loss Related to Forest Fires			4
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	28		30	[7]	26
Real Estate [Member] | PLUM CREEK TIMBER CO INC [Member]
Impairment Losses	7		4		0
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	1		1		1
Real Estate [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Impairment Losses	7		4		0
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	1		1		1
Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss	2
Other Operating Income	11	[8]	0		0
Depreciation, Depletion and Amortization	14		16		15
Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss	2
Other Operating Income	11	[9]	0		0
Depreciation, Depletion and Amortization	14		16		15
Energy and Natural Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Other Operating Income	2	[10]	1	[10]	0
Gain (Loss) on Sale of Minerals			1
Depreciation, Depletion and Amortization	8		3		1
Energy and Natural Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Other Operating Income	2	[11]	1	[11]	0
Gain (Loss) on Sale of Minerals			1
Depreciation, Depletion and Amortization	8		3		1
Other Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	0		0		0
Other Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Other Operating Income	0		0		0
Depreciation, Depletion and Amortization	0		0		0
Unallocated Amount to Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
Depreciation, Depletion and Amortization	3		4		4
Unallocated Amount to Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Depreciation, Depletion and Amortization	3		4		4
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	3		0		0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	3		0		0
MWV-CLP [Member] | Northern Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Northern Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Real Estate [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Real Estate [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Energy and Natural Resources [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Energy and Natural Resources [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	0		0		0
MWV-CLP [Member] | Other Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
Earnings from Unconsolidated Entities	3	[12]	0		0
MWV-CLP [Member] | Other Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Earnings from Unconsolidated Entities	3	[12]	0		0
Building and Equipment Repair and Replacement Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	10
Building and Equipment Repair and Replacement Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	10
Business Interruption Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	3
Business Interruption Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	3
Total Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	13					4	5	4
Total Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	$13					$4	$5	$4
[1]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 5 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[2]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the company recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[3]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the company from a third party.
[4]	During 2014, timberlands held for sale with a carrying value totaling $53 million were written down to their fair value (net of estimated selling costs) of $46 million, resulting in a loss of $7 million, which was included in earnings for the year ended December 31, 2014. These timberlands were sold in December 2014. See Note 4 of the Notes to Consolidated Financial Statements. The fair value for the property was based on an external appraisal. The external appraisal was derived using comparable sales.
[5]	During the fourth quarter of 2014, Plum Creek's Board of Directors approved the sale of approximately 165,000 acres of timberlands in Montana and Washington with a book basis of $122 million to The Nature Conservancy for $131 million. The sale closed in two phases - the first phase, which consisted of approximately 48,000 acres in Washington, closed in December 2014, and the second phase, which consisted of approximately 117,000 acres in Montana, closed in January 2015. Although the overall transaction resulted in a gain, the Operating Partnership recognized an impairment loss of $7 million during 2014 in connection with the Washington portion of the sale. The book basis of the Montana portion of the sale is recorded as Assets Held for Sale in the Consolidated Balance Sheets as of December 31, 2014.
[6]	During 2013, timberlands held for sale for three different properties with a carrying value totaling $41 million were written down to their fair value (net of estimated selling costs) of $37 million, resulting in a loss of $4 million, which was included in earnings for the year ended December 31, 2013. The fair value for two of the properties was based on external appraisals which were derived from a combination of comparable sales and discounted future cash flows. The discounted future cash flows were based on estimated future timber prices and operating expenses. The fair value for the remaining property was based on an offer received by the Operating Partnership from a third party.
[7]	During 2013, the Northern Resources Segment recognized a loss of $4 million related to forest fires, which is included in depreciation, depletion and amortization in the consolidated financial statements.
[8]	During 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[9]	During 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries. Insurance recoveries were $10 million for the costs incurred during 2014 to rebuild or replace the damaged building and equipment and $3 million for business interruption costs. Substantially all of the costs incurred to rebuild or replace the damaged building and equipment were capitalized during 2014. Both the building and equipment loss and the insurance recoveries are reported in Other Operating Gain for the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[10]	During 2014, the company agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the company sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[11]	During 2014, the Operating Partnership agreed to terminate a land lease for consideration of $2 million from the lessor. The land lease had been accounted for as an operating lease. The $2 million consideration was primarily for the release of mineral rights. During 2013, the Operating Partnership sold certain mineral reserves for a gain of $1 million. These gains are reported as Other Operating Gain in our Energy and Natural Resources Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income.
[12]	For segment reporting, Equity Earnings from Real Estate Development Ventures of $3 million for 2014 is included in Operating Income (Loss) for the Other Segment.

Subsequent_Events_Details

Subsequent Events (Details) (PLUM CREEK TIMBER CO INC [Member], USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Dividends Payable, Date Declared, Day, Month and Year	4-Feb-15
Dividend Payment per Share	$0.44
Dividend Payment, Approximately	$77
Dividends Payable, Date to be Paid, Day, Month and Year	27-Feb-15
Stockholders of Record Date	13-Feb-15

Unaudited_Selected_Quarterly_F2

Unaudited Selected Quarterly Financial Data (Details) (USD $)	3 Months Ended																12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income																	$214	$214	$203
Net Income per Share-Basic																	$1.21	$1.30	$1.25
Net Income per Share-Diluted																	$1.21	$1.30	$1.25
PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss																	2	0	0
Insurance Recoveries																	13	1	0
Loss on Extinguishment of Debt																	0	4	0
Revenues	428		375		356		317		331		366		303		340		1,476	1,340	1,339
Gross Profit	119		109		109		85		98		122		90		110
Operating Income (Loss)	92	[1]	91	[1]	82	[1]	57	[1]	64		91		62		78		322	295	281
Net Income	68		61		55		30		40	[2]	72		46		56		214	214	203
Net Income per Share-Basic	$0.39	[3]	$0.34	[3]	$0.31	[3]	$0.17	[3]	$0.24	[3]	$0.44	[3]	$0.28	[3]	$0.35	[3]	$1.21	$1.30	$1.25
Net Income per Share-Diluted	$0.39	[3]	$0.34	[3]	$0.31	[3]	$0.17	[3]	$0.24	[3]	$0.44	[3]	$0.28	[3]	$0.35	[3]	$1.21	$1.30	$1.25
PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss																	2	0	0
Insurance Recoveries																	13	1	0
Loss on Extinguishment of Debt																	0	4	0
Revenues	428		375		356		317		331		366		303		340		1,476	1,340	1,339
Gross Profit	119		109		109		85		98		122		90		110
Operating Income (Loss)	92	[4]	91	[4]	82	[4]	57	[4]	64		91		62		78		322	295	281
Net Income	68		61		55		30		40	[5]	72		46		56		214	214	203
Private Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Early Repayment Of Debt																		10
Private Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Early Repayment Of Debt																		10
Public Debt [Member] | PLUM CREEK TIMBER CO INC [Member]
Early Repayment Of Debt																		24
Public Debt [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Early Repayment Of Debt																		24
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Early Repayment Of Debt																		225
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Early Repayment Of Debt																		225
Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
MDF Fire Impairment Loss																	2
Revenues																	368	362	324
Operating Income (Loss)																	49	43	29
Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
MDF Fire Impairment Loss																	2
Revenues																	368	362	324
Operating Income (Loss)																	49	43	29
Total Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Insurance Recoveries	4		5		4												13
Total Insurance Recoveries [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Insurance Recoveries	$4		$5		$4												$13
[1]	During the second quarter of 2014, the company experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the company also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 21 of the Notes to Consolidated Financial Statements.
[2]	During the fourth quarter of 2013, the company prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 11 of the Notes to Consolidated Financial Statements.
[3]	Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may not equal the total computed for the year.
[4]	During the second quarter of 2014, the Operating Partnership experienced a fire at its MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. During 2014, the Operating Partnership also recorded a $13 million gain related to insurance recoveries, of which $4 million, $5 million and $4 million was recorded in the second, third, and fourth quarters of 2014, respectively. Both the building and equipment loss and the insurance recoveries are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. See Note 19 of the Notes to Consolidated Financial Statements.
[5]	During the fourth quarter of 2013, the Operating Partnership prepaid approximately $10 million of principal of Private Debt, $24 million of principal of Public Debt and $225 million of principal of the term credit agreement. These prepayments resulted in a $4 million loss. The $4 million loss is classified as Loss on Extinguishment of Debt in the Consolidated Statements of Income. See Note 9 of the Notes to Consolidated Financial Statements.

Supplemental_Disclosures_Detai

Supplemental Disclosures (Details) (PLUM CREEK TIMBERLANDS L P [Member], USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
PLUM CREEK TIMBERLANDS L P [Member]
Senior Notes Short and Long-Term Aggregate	$1,333