Plum Creek Timber (PCL) 10-Q 4 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Entity Registrant Name	PLUM CREEK TIMBER CO INC
Entity Central Index Key	849,213
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		174,729,333
PLUM CREEK TIMBERLANDS L P [Member]
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Entity Registrant Name	Plum Creek Timberlands LP
Entity Central Index Key	1,296,350
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Expense, net:
Net Income	$ 21	$ 55	$ 63	$ 85
PER SHARE AMOUNTS:
Net Income per Share-Basic	$ 0.12	$ 0.31	$ 0.35	$ 0.48
Net Income per Share-Diluted	$ 0.12	$ 0.31	$ 0.35	$ 0.47
Weighted-Average Number of Shares Outstanding
-Basic	175.5	177.1	175.7	177.1
-Diluted	175.7	177.4	175.9	177.4
PLUM CREEK TIMBER CO INC [Member]
REVENUES:
Timber	$ 170	$ 171	$ 362	$ 363
Real Estate	25	77	134	100
Manufacturing	92	94	186	184
Energy and Natural Resources	8	9	16	18
Other	7	5	10	8
Total Revenues	302	356	708	673
COSTS AND EXPENSES:
Timber	127	125	266	263
Real Estate	12	30	101	40
Manufacturing	77	84	160	163
Energy and Natural Resources	3	3	5	5
Other	8	5	10	8
Total Cost of Goods Sold	227	247	542	479
Selling, General and Administrative	32	30	65	59
Total Costs and Expenses	259	277	607	538
Other Operating Income (Expense), net	2	3	5	4
Operating Income	45	82	106	139
Earnings from Unconsolidated Entities	19	15	41	29
Interest Expense, net:
Interest Expense (Debt Obligations to Unrelated Parties)	27	27	54	54
Interest Expense (Note Payable to Timberland Venture)	15	15	29	29
Total Interest Expense, net	42	42	83	83
Income before Income Taxes	22	55	64	85
Provision (Benefit) for Income Taxes	1	0	1	0
Net Income	$ 21	$ 55	$ 63	$ 85
PER SHARE AMOUNTS:
Net Income per Share-Basic	$ 0.12	$ 0.31	$ 0.35	$ 0.48
Net Income per Share-Diluted	0.12	0.31	0.35	0.47
Dividends Declared - per Common Share Outstanding	$ 0.44	$ 0.44	$ 0.88	$ 0.88
Weighted-Average Number of Shares Outstanding
-Basic	175.5	177.1	175.7	177.1
-Diluted	175.7	177.4	175.9	177.4
PLUM CREEK TIMBERLANDS L P [Member]
REVENUES:
Timber	$ 170	$ 171	$ 362	$ 363
Real Estate	25	77	134	100
Manufacturing	92	94	186	184
Energy and Natural Resources	8	9	16	18
Other	7	5	10	8
Total Revenues	302	356	708	673
COSTS AND EXPENSES:
Timber	127	125	266	263
Real Estate	12	30	101	40
Manufacturing	77	84	160	163
Energy and Natural Resources	3	3	5	5
Other	8	5	10	8
Total Cost of Goods Sold	227	247	542	479
Selling, General and Administrative	32	30	65	59
Total Costs and Expenses	259	277	607	538
Other Operating Income (Expense), net	2	3	5	4
Operating Income	45	82	106	139
Earnings from Unconsolidated Entities	19	15	41	29
Interest Expense, net:
Total Interest Expense, net	27	27	54	54
Income before Income Taxes	37	70	93	114
Provision (Benefit) for Income Taxes	1	0	1	0
Net Income before Allocation to Series T-1 Preferred Interest and Partners	36	70	92	114
Net Income Allocable to Series T-1 Preferred Interest	(15)	(15)	(29)	(29)
Net Income	21	55	63	85
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	17	17	40	32
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	17	17	40	32
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
COSTS AND EXPENSES:
Earnings from Unconsolidated Entities	$ 2	$ (2)	$ 1	$ (3)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income	$ 21	$ 55	$ 63	$ 85
PLUM CREEK TIMBER CO INC [Member]
Net Income	21	55	63	85
Defined Benefit Pension Plans [Abstract]
Amortization of Actuarial Loss Reclassified to Pension Expense	1	1	2	1
Unrealized Gains (Losses) on Grantor Trust Assets [Abstract]
Unrealized Holding Gains (Losses) Arising During Period	0	(2)	(1)	(1)
Reclassification for Amounts Recognized in Net Income	0	0	(1)	0
Other Comprehensive Income (Loss), before Tax	1	(1)	0	0
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income	0	0	0	0
Other Comprehensive Income (Loss) After Tax	1	(1)	0	0
Comprehensive Income	22	54	63	85
PLUM CREEK TIMBERLANDS L P [Member]
Net Income	21	55	63	85
Net Income before Allocation to Series T-1 Preferred Interest and Partners	36	70	92	114
Defined Benefit Pension Plans [Abstract]
Amortization of Actuarial Loss Reclassified to Pension Expense	1	1	2	1
Unrealized Gains (Losses) on Grantor Trust Assets [Abstract]
Unrealized Holding Gains (Losses) Arising During Period	0	(2)	(1)	(1)
Reclassification for Amounts Recognized in Net Income	0	0	(1)	0
Other Comprehensive Income (Loss), before Tax	1	(1)	0	0
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income	0	0	0	0
Other Comprehensive Income (Loss) After Tax	1	(1)	0	0
Comprehensive Income	$ 37	$ 69	$ 92	$ 114

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Current Assets:
Cash and Cash Equivalents	$ 83	$ 92
Accounts Receivable	43	38
Inventories	56	61
Deferred Tax Asset	6	6
Assets Held for Sale	60	98
Other Current Assets	15	15
Total Current Assets	263	310
Timber and Timberlands, net	3,945	4,009
Minerals and Mineral Rights, net	286	289
Property, Plant and Equipment, net	118	120
Equity Investment in Timberland Venture	227	217
Equity Investment in Real Estate Development Ventures	126	126
Deferred Tax Asset	25	23
Investment in Grantor Trusts ($48 at Fair Value in 2015 and 2014)	48	48
Other Assets	42	45
Total Assets	5,080	5,187
Current Liabilities:
Current Portion of Long-Term Debt	439	439
Line of Credit	108	95
Accounts Payable	35	27
Interest Payable	26	22
Wages Payable	18	31
Taxes Payable	15	10
Deferred Revenue	34	23
Other Current Liabilities	11	10
Total Current Liabilities	686	657
Long-Term Debt	1,976	1,976
Note Payable to Timberland Venture	783	783
Other Liabilities	102	100
Total Liabilities	$ 3,547	$ 3,516
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) - 174.9 at June 30, 2015 and 175.9 at December 31, 2014	2	2
Additional Paid-In Capital	2,961	2,955
Retained Earnings (Accumulated Deficit)	(363)	(271)
Treasury Stock, at Cost, Common Shares - 29.5 at June 30, 2015 and 28.3 at December 31, 2014	(1,044)	(992)
Accumulated Other Comprehensive Income (Loss)	(23)	(23)
Total Stockholders' Equity	1,533	1,671
Total Liabilities and Stockholders' Equity	5,080	5,187
PLUM CREEK TIMBERLANDS L P [Member]
Current Assets:
Cash and Cash Equivalents	83	92
Accounts Receivable	43	38
Inventories	56	61
Deferred Tax Asset	6	6
Assets Held for Sale	60	98
Other Current Assets	15	15
Total Current Assets	263	310
Timber and Timberlands, net	3,945	4,009
Minerals and Mineral Rights, net	286	289
Property, Plant and Equipment, net	118	120
Equity Investment in Timberland Venture	227	217
Equity Investment in Real Estate Development Ventures	126	126
Deferred Tax Asset	25	23
Investment in Grantor Trusts ($48 at Fair Value in 2015 and 2014)	49	49
Other Assets	42	45
Total Assets	5,081	5,188
Current Liabilities:
Current Portion of Long-Term Debt	439	439
Line of Credit	108	95
Accounts Payable	35	27
Interest Payable	19	15
Wages Payable	18	31
Taxes Payable	15	10
Deferred Revenue	34	23
Other Current Liabilities	11	10
Total Current Liabilities	679	650
Long-Term Debt	1,976	1,976
Other Liabilities	103	101
Total Liabilities	$ 2,758	$ 2,727
Commitments and Contingencies
Stockholders' Equity
Accumulated Other Comprehensive Income (Loss)	$ (23)	$ (23)
PARTNERSHIP CAPITAL
Series T-1 Preferred Interest	790	790
Partners' Capital (Common Partnership Interests)	1,533	1,671
Total Partnership Capital	2,323	2,461
Total Liabilities and Partnership Capital	$ 5,081	$ 5,188

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	75	75
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	300.6	300.6
Common Stock, Shares, Outstanding	174.9	175.9
Treasury Stock, Shares	29.5	28.3
PLUM CREEK TIMBERLANDS L P [Member]
Other Marketable Securities Noncurrent Fair Value	$ 48	$ 48

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 63	$ 85
PLUM CREEK TIMBER CO INC [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	63	85
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization (Includes $2 MDF Fire Impairment Loss in 2014)	65	66
Basis of Real Estate Sold	92	31
Earnings from Unconsolidated Entities	(41)	(29)
Distributions from Timberland Venture	30	28
Distributions from Real Estate Development Ventures	1	0
Deferred Income Taxes	(2)	0
Working Capital Changes	15	7
Other	4	1
Net Cash Provided By (Used In) Operating Activities	227	189
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures, Excluding Timberland Acquisitions (Includes $4 MDF Fire Replacement Capital in 2014)	(38)	(40)
Timberlands Acquired	(7)	0
Contributions to Real Estate Development Ventures	(2)	(4)
Distributions from Real Estate Development Ventures	2	1
Insurance Recoveries (Property Damage)	1	0
Sales (Purchases) of Marketable Securities, net	1	0
Net Cash Provided By (Used In) Investing Activities	(43)	(43)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends	(155)	(156)
Borrowings on Line of Credit	216	748
Repayments on Line of Credit	(203)	(1,063)
Proceeds from Stock Option Exercises	1	1
Acquisition of Treasury Stock	(52)	(2)
Net Cash Provided By (Used In) Financing Activities	(193)	(472)
Increase (Decrease) In Cash and Cash Equivalents	(9)	(326)
Cash and Cash Equivalents:
Beginning of Period	92	433
End of Period	83	107
PLUM CREEK TIMBERLANDS L P [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	63	85
Net Income before Allocation to Series T-1 Preferred Interest and Partners	92	114
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization (Includes $2 MDF Fire Impairment Loss in 2014)	65	66
Basis of Real Estate Sold	92	31
Earnings from Unconsolidated Entities	(41)	(29)
Distributions from Timberland Venture	30	28
Distributions from Real Estate Development Ventures	1	0
Deferred Income Taxes	(2)	0
Working Capital Changes	15	7
Other	4	1
Net Cash Provided By (Used In) Operating Activities	256	218
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures, Excluding Timberland Acquisitions (Includes $4 MDF Fire Replacement Capital in 2014)	(38)	(40)
Timberlands Acquired	(7)	0
Contributions to Real Estate Development Ventures	(2)	(4)
Distributions from Real Estate Development Ventures	2	1
Insurance Recoveries (Property Damage)	1	0
Sales (Purchases) of Marketable Securities, net	1	0
Net Cash Provided By (Used In) Investing Activities	(43)	(43)
CASH FLOWS FROM FINANCING ACTIVITIES
Cash Distributions to Common Partners	(206)	(157)
Cash Distributions for Series T-1 Preferred Interest	(29)	(29)
Borrowings on Line of Credit	216	748
Repayments on Line of Credit	(203)	(1,063)
Net Cash Provided By (Used In) Financing Activities	(222)	(501)
Increase (Decrease) In Cash and Cash Equivalents	(9)	(326)
Cash and Cash Equivalents:
Beginning of Period	92	433
End of Period	$ 83	$ 107

Consolidated Statements of Cas7

Consolidated Statements of Cash Flows Parenthetical (Parentheticals) $ in Millions	6 Months Ended
	Jun. 30, 2014USD ($)
PLUM CREEK TIMBER CO INC [Member]
MDF Replacement Capital	$ 4
MDF Fire Impairment Loss	2
PLUM CREEK TIMBERLANDS L P [Member]
MDF Replacement Capital	4
MDF Fire Impairment Loss	$ 2

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Basis of Presentation	Basis of Presentation General. When we refer to “Plum Creek,” “the company,” “we,” “us,” or “our,” we mean Plum Creek Timber Company, Inc., a Delaware Corporation and a real estate investment trust, or “REIT,” and all of its wholly-owned consolidated subsidiaries. The consolidated financial statements include all of the accounts of Plum Creek and its subsidiaries. At June 30, 2015 , the company owned and managed approximately 6.4 million acres of timberlands in the Northwest, Southern, and Northeast United States. Included in the 6.4 million acres are approximately 675,000 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 675,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 100,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. 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. At June 30, 2015 , the company owned seven wood product conversion facilities in the Northwest United States. In March 2015, due to the loss of a significant customer, the company permanently closed its remanufacturing facility in Meridian, Idaho. Plum Creek has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code and, as such, generally does not pay corporate-level income tax. However, the company conducts certain non-REIT activities through various taxable REIT subsidiaries, which are subject to corporate-level income tax. These activities include our manufacturing operations, the harvesting and selling of logs, the development and/or sale of some of our higher value timberlands, timber and wood fiber procurement services, coal leases, and the company's investment in real estate development ventures. Plum Creek’s overall effective tax rate is lower than the federal statutory corporate rate due to Plum Creek’s status as a REIT. Intercompany transactions and accounts have been eliminated in consolidation. All transactions are denominated in United States dollars. The consolidated financial statements included in this Form 10-Q are unaudited and do not contain all of the information required by U.S. generally accepted accounting principles to be included in a full set of financial statements. The consolidated balance sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The audited financial statements in the company’s 2014 Annual Report on Form 10-K include a summary of significant accounting policies of the company and should be read in conjunction with this Form 10-Q. In the opinion of management, all material adjustments necessary to present fairly the results of operations for such periods have been included in this Form 10-Q. All such adjustments are of a normal and recurring nature. The results of operations for interim periods are not necessarily indicative of the results of operations for the entire year. Reclassifications. Certain prior year amounts have been reclassified to conform to the 2015 presentation. The reclassifications had no impact on operating income or net income.
PLUM CREEK TIMBERLANDS L P [Member]
Basis of Presentation	Basis of Presentation 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 June 30, 2015 , the Operating Partnership owned and managed approximately 6.4 million acres of timberlands in the Northwest, Southern, and Northeast United States. Included in the 6.4 million acres are approximately 675,000 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 675,000 acres of higher value timberlands are approximately 500,000 acres we expect to sell for recreational uses, approximately 100,000 acres we expect to sell for conservation and approximately 75,000 acres that are identified as having development potential. 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. At June 30, 2015 , the Operating Partnership owned seven wood product conversion facilities in the Northwest United States. In March 2015, due to the loss of a significant customer, the Operating Partnership permanently closed its remanufacturing facility in Meridian, Idaho. 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. Plum Creek Timber Company, Inc. has elected to be taxed as a REIT under sections 856-860 of the United States Internal Revenue Code and, as such, generally does not pay corporate-level income tax. However, 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 selling 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. 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 consolidated financial statements included in this Form 10-Q are unaudited and do not contain all of the information required by U.S. generally accepted accounting principles to be included in a full set of financial statements. These interim consolidated financial statements in this Form 10-Q should be read in conjunction with the audited consolidated financial statements of Plum Creek Timberlands, L.P. for the three years ended December 31, 2014 , which were included on Form 10-K of Plum Creek Timber Company, Inc. and filed with the SEC on February 26, 2015 , and which include a summary of significant accounting policies of the Operating Partnership. In the opinion of management, all material adjustments necessary to present fairly the results of operations for such periods have been included in this Form 10-Q. All such adjustments are of a normal and recurring nature. The results of operations for interim periods are not necessarily indicative of the results of operations for the entire year. Reclassifications. Certain prior year amounts have been reclassified to conform to the 2015 presentation. The reclassifications had no impact on operating income or net income.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2015
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 quarterly and six-month periods ended June 30 (in millions, except per share amounts): Quarter Ended June 30, 2015 2014 Net Income Available to Common Stockholders $ 21 $ 55 Denominator for Basic Earnings per Share 175.5 177.1 Effect of Dilutive Securities – Stock Options 0.2 0.2 Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan — 0.1 Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities 175.7 177.4 Per Share Amounts: Net Income Per Share – Basic $ 0.12 $ 0.31 Net Income Per Share – Diluted $ 0.12 $ 0.31 Six Months Ended June 30, 2015 2014 Net Income Available to Common Stockholders $ 63 $ 85 Denominator for Basic Earnings per Share 175.7 177.1 Effect of Dilutive Securities – Stock Options 0.2 0.2 Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan — 0.1 Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities 175.9 177.4 Per Share Amounts: Net Income Per Share - Basic $ 0.35 $ 0.48 Net Income Per Share - Diluted $ 0.35 $ 0.47 Under the company's Stock Incentive Plan, 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.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2015
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): June 30, 2015 December 31, 2014 Raw Materials (primarily logs) $ 9 $ 12 Work-In-Process 3 3 Finished Goods 29 31 41 46 Supplies 15 15 Total $ 56 $ 61
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): June 30, 2015 December 31, 2014 Raw Materials (primarily logs) $ 9 $ 12 Work-In-Process 3 3 Finished Goods 29 31 41 46 Supplies 15 15 Total $ 56 $ 61

Timber and Timberlands

Timber and Timberlands	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands	Timber and Timberlands Timber and Timberlands consisted of the following (in millions): June 30, 2015 December 31, 2014 Timber and Logging Roads, net $ 2,490 $ 2,518 Timber Deeds, net 75 83 Timberlands 1,380 1,408 Timber and Timberlands, net $ 3,945 $ 4,009
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands	Timber and Timberlands Timber and Timberlands consisted of the following (in millions): June 30, 2015 December 31, 2014 Timber and Logging Roads, net $ 2,490 $ 2,518 Timber Deeds, net 75 83 Timberlands 1,380 1,408 Timber and Timberlands, net $ 3,945 $ 4,009

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Property, Plant and Equipment	Property, Plant and Equipment Property, Plant and Equipment consisted of the following (in millions): June 30, 2015 December 31, 2014 Land, Buildings and Improvements $ 99 $ 97 Machinery and Equipment 335 331 434 428 Accumulated Depreciation (316 ) (308 ) Property, Plant and Equipment, net $ 118 $ 120
PLUM CREEK TIMBERLANDS L P [Member]
Property, Plant and Equipment	Property, Plant and Equipment Property, Plant and Equipment consisted of the following (in millions): June 30, 2015 December 31, 2014 Land, Buildings and Improvements $ 99 $ 97 Machinery and Equipment 335 331 434 428 Accumulated Depreciation (316 ) (308 ) Property, Plant and Equipment, net $ 118 $ 120

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Income Tax Disclosure [Text Block]	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. 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. Plum Creek's taxable REIT subsidiaries file a consolidated federal income tax return. 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. Based on recent discussions with IRS Appeals, the company does not expect to reach a resolution with IRS Appeals and plans to file a petition in the United States Tax Court. If the IRS's position is upheld on 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 on the undistributed gain, which would 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 and do not believe it is reasonably possible any material accrual will be made within the next twelve months. 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 Tax Disclosure [Text Block]	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 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. 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. 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. Based on recent discussions with IRS Appeals, Plum Creek does not expect to reach a resolution with IRS Appeals and plans to file a petition in the United States Tax Court. If the IRS's position is upheld on 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 on the undistributed gain, which would 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 and do not believe it is reasonably possible any material accrual will be made within the next twelve months. 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.

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Borrowings	Borrowings Debt consisted of the following (in millions): June 30, 2015 December 31, 2014 Variable Rate Debt Term Credit Agreement (A) $ 225 $ 225 Revolving Line of Credit (B) 108 95 Fixed Rate Debt Senior Notes 1,330 1,330 Installment Note Payable 860 860 Note Payable to Timberland Venture 783 783 Total Debt 3,306 3,293 Less: Current Portion of Long-Term Debt 439 439 Line of Credit 108 95 Long-Term Portion $ 2,759 $ 2,759 (A) The company has a $225 million term credit agreement that matures on April 3, 2019 . The interest rate on the $225 million term credit agreement was 1.69% and 1.67% as of June 30, 2015 and December 31, 2014 , respectively. After giving effect to expected patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both June 30, 2015 and December 31, 2014 . (B) The weighted-average interest rate for the borrowings on the line of credit was 1.38% and 1.34% as of June 30, 2015 and December 31, 2014 , respectively. As of June 30, 2015 , we had $108 million of borrowings and $1 million of standby letters of credit outstanding; $591 million remained available for borrowing under our $700 million line of credit. As of July 1, 2015 , $73 million of the borrowings outstanding under our line of credit was repaid.
PLUM CREEK TIMBERLANDS L P [Member]
Borrowings	Borrowings Debt consisted of the following (in millions): June 30, 2015 December 31, 2014 Variable Rate Debt Term Credit Agreement (A) $ 225 $ 225 Revolving Line of Credit (B) 108 95 Fixed Rate Debt Senior Notes 1,330 1,330 Installment Note Payable 860 860 Total Debt 2,523 2,510 Less: Current Portion of Long-Term Debt 439 439 Line of Credit 108 95 Long-Term Portion $ 1,976 $ 1,976 (A) The Operating Partnership has a $225 million term credit agreement that matures on April 3, 2019 . The interest rate on the $225 million term credit agreement was 1.69% and 1.67% as of June 30, 2015 and December 31, 2014 , respectively. After giving effect to expected patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both June 30, 2015 and December 31, 2014 . (B) The weighted-average interest rate for the borrowings on the line of credit was 1.38% and 1.34% as of June 30, 2015 and December 31, 2014 , respectively. As of June 30, 2015 , we had $108 million of borrowings and $1 million of standby letters of credit outstanding; $591 million remained available for borrowing under our $700 million line of credit. As of July 1, 2015 , $73 million of the borrowings outstanding under our line of credit was repaid.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Stockholders' Equity	Stockholders’ Equity The changes in the company’s stockholders’ equity accounts were as follows during 2015 (in millions): Common Stock Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Income (Loss) Shares Dollars Paid-in Capital Treasury Stock Total Equity January 1, 2015 175.9 $ 2 $ 2,955 $ (271 ) $ (992 ) $ (23 ) $ 1,671 Net Income 42 42 Other Comprehensive Income (Loss) (1 ) (1 ) Dividends (77 ) (77 ) Stock Option Exercises — — 1 1 Shares Issued under Stock Incentive Plans 0.2 — — — Share-based Compensation 3 3 Common Stock Repurchased (0.5 ) — (21 ) (21 ) March 31, 2015 175.6 $ 2 $ 2,959 $ (306 ) $ (1,013 ) $ (24 ) $ 1,618 Net Income 21 21 Other Comprehensive Income (Loss) 1 1 Dividends (78 ) (78 ) Share-based Compensation 2 2 Common Stock Repurchased (0.7 ) — (31 ) (31 ) June 30, 2015 174.9 $ 2 $ 2,961 $ (363 ) $ (1,044 ) $ (23 ) $ 1,533 The changes in the company’s accumulated other comprehensive income (loss) by component, net of tax, were as follows during 2015 (in millions): Net Unrealized Holding Gain (Loss) (A) Defined Benefit Plan Actuarial Net Loss (B) Gain on Cash Flow Hedge Total January 1, 2015 $ 14 $ (42 ) $ 5 $ (23 ) Other Comprehensive Income (Loss) before Reclassifications (1 ) — — (1 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1 ) 1 — — March 31, 2015 $ 12 $ (41 ) $ 5 $ (24 ) Other Comprehensive Income (Loss) before Reclassifications — — — — Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1 — 1 June 30, 2015 $ 12 $ (40 ) $ 5 $ (23 ) (A) Unrealized holding gains are reclassified to Other Operating Income (Expense), net in the Consolidated Statements of Income when the related available for sale securities are sold. (B) Amortization of actuarial gains and losses on the company's defined benefit pension plans is included in the computation of pension cost. See Note 10 of the Notes to Consolidated Financial Statements.

Partners' Capital

Partners' Capital	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBERLANDS L P [Member]
Partners' Capital	Partners’ Capital The changes in the Operating Partnership’s capital accounts were as follows during 2015 (in millions): Preferred Partnership Interest Common Partners’ Capital Accumulated Other Comprehensive Income (Loss) Total Partnership Capital January 1, 2015 $ 790 $ 1,694 $ (23 ) $ 2,461 Net Income before Allocation to Series T-1 Preferred Interest and Partners 56 56 Other Comprehensive Income (Loss) (1 ) (1 ) Net Income Allocation to Series T-1 Preferred Interest 14 (14 ) — Distributions to Partners (Common Partnership Interests) (97 ) (97 ) Distributions for Series T-1 Preferred Interest (14 ) (14 ) Capital Contributions from Parent 3 3 March 31, 2015 $ 790 $ 1,642 $ (24 ) $ 2,408 Net Income before Allocation to Series T-1 Preferred Interest and Partners 36 36 Other Comprehensive Income (Loss) 1 1 Net Income Allocation to Series T-1 Preferred Interest 15 (15 ) — Distributions to Partners (Common Partnership Interests) (109 ) (109 ) Distributions for Series T-1 Preferred Interest (15 ) (15 ) Capital Contributions from Parent 2 2 June 30, 2015 $ 790 $ 1,556 $ (23 ) $ 2,323 The changes in the Operating Partnership's accumulated other comprehensive income (loss) by component, net of tax, were as follows during 2015 (in millions): Net Unrealized Holding Gain (Loss) (A) Defined Benefit Plan Actuarial Net Loss (B) Gain on Cash Flow Hedge Total January 1, 2015 $ 14 $ (42 ) $ 5 $ (23 ) Other Comprehensive Income (Loss) before Reclassifications (1 ) — — (1 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1 ) 1 — — March 31, 2015 $ 12 $ (41 ) $ 5 $ (24 ) Other Comprehensive Income (Loss) before Reclassifications — — — — Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1 — 1 June 30, 2015 $ 12 $ (40 ) $ 5 $ (23 ) (A) Unrealized holding gains are reclassified to Other Operating Income (Expense), net in the Consolidated Statements of Income when the related available for sale securities are sold. (B) 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 9 of the Notes to Consolidated Financial Statements.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2015
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 at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements) Cash Equivalents (A) $ 80 $ 80 Available-for-Sale Securities (B) 43 43 Trading Securities (B) 5 5 Total $ 128 $ 128 Balance at Fair Value Measurements 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 (A) Consists of several money market funds and is included in the $83 million and $92 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 , respectively. (B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 . At June 30, 2015 , 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 quarters and six-month periods ended June 30, 2015 and June 30, 2014 . As of both June 30, 2015 and December 31, 2014 , the amortized cost of the available-for-sale securities was approximately $31 million . See Note 8 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 June 30, 2015 and December 31, 2014 . Changes in the fair value of trading securities were not material to the company's financial position or results of operations for the quarters and six-month periods ended June 30, 2015 and June 30, 2014 . 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 June 30, 2015 Carrying Amount at June 30, 2015 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Public Debt (A) $ 1,330 $ — $ 1,373 $ — $ 1,373 Term Credit Agreement (B) 225 — 225 — 225 Line of Credit (C) 108 — 108 — 108 Installment Note Payable (D) 860 — 891 — 891 Note Payable to Timberland Venture (E) 783 — — 890 890 Total Debt $ 3,306 $ — $ 2,597 $ 890 $ 3,487 Fair Value at December 31, 2014 Carrying Amount at Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total 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 (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. There were no fair value measurements of assets or liabilities measured on a nonrecurring basis during the six -month periods ended June 30, 2015 and 2014 .
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 at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements) Cash Equivalents (A) $ 80 $ 80 Available-for-Sale Securities (B) 43 43 Trading Securities (B) 5 5 Total $ 128 $ 128 Balance at Fair Value Measurements 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 (A) Consists of several money market funds and is included in the $83 million and $92 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 , respectively. (B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 . At June 30, 2015 , 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 quarters and six-month periods ended June 30, 2015 and June 30, 2014 . As of both June 30, 2015 and December 31, 2014 , the amortized cost of the available-for-sale securities was approximately $31 million . See Note 7 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 June 30, 2015 and December 31, 2014 . Changes in the fair value of trading securities were not material to the Operating Partnership's financial position or results of operations for the quarters and six-month periods ended June 30, 2015 and June 30, 2014 . 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 June 30, 2015 Carrying Amount at June 30, 2015 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Public Debt (A) $ 1,330 $ — $ 1,373 $ — $ 1,373 Term Credit Agreement (B) 225 — 225 — 225 Line of Credit (C) 108 — 108 — 108 Installment Note Payable (D) 860 — 891 — 891 Total Debt $ 2,523 $ — $ 2,597 $ — $ 2,597 Fair Value at December 31, 2014 Carrying Amount at Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total 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 (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. There were no fair value measurements of assets or liabilities measured on a nonrecurring basis during the six -month periods ended June 30, 2015 and 2014 .

Employee Pension Plans

Employee Pension Plans	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Employee Pension Plans	Employee Pension Plans The components of pension cost were as follows for the quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Service Cost $ 2 $ 2 Interest Cost 3 2 Expected Return on Plan Assets (3 ) (3 ) Recognized Actuarial Loss 1 1 Total Pension Cost $ 3 $ 2 Six Months Ended June 30, 2015 2014 Service Cost $ 4 $ 4 Interest Cost 5 4 Expected Return on Plan Assets (6 ) (5 ) Recognized Actuarial Loss 2 1 Total Pension Cost $ 5 $ 4
PLUM CREEK TIMBERLANDS L P [Member]
Employee Pension Plans	Employee Pension Plans The components of pension cost were as follows for the quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Service Cost $ 2 $ 2 Interest Cost 3 2 Expected Return on Plan Assets (3 ) (3 ) Recognized Actuarial Loss 1 1 Total Pension Cost $ 3 $ 2 Six Months Ended June 30, 2015 2014 Service Cost $ 4 $ 4 Interest Cost 5 4 Expected Return on Plan Assets (6 ) (5 ) Recognized Actuarial Loss 2 1 Total Pension Cost $ 5 $ 4

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
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 in Note 6 , 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 Note 6 of the Notes to Consolidated Financial Statements for a discussion of a tax proceeding involving the company and its consolidated subsidiaries.
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 in Note 5 , 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 Note 5 of the Notes to Consolidated Financial Statements for a discussion of a tax proceeding involving Plum Creek.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Variable Interest Entities Real Estate Development Ventures. MWV-Charleston Land Partners, LLC (“MWV-CLP”) 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 64,000 acres of high-value rural and development-quality lands ("Class B Properties"). MWV-CLP is managed by an affiliate of WestRock Company (formerly MeadWestvaco Corporation). 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 made an initial capital contribution of $152 million in 2013. Also, during the years 2014 to 2020, the company agreed to make additional capital contributions of at least $48 million in connection with its interest in the Class B Properties, of which $37 million remained outstanding as of June 30, 2015 . The company does not intend to provide any other sources of financing for MWV-CLP. We account for our interest in MWV-CLP under the equity method of accounting. 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. WestRock Company 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. WestRock Company also has the ability to control all management decisions associated with the 22,000 acres of the 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 as of both June 30, 2015 and December 31, 2014 , 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 $37 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. 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 company accounts for its interest in the Timberland Venture under the equity method of accounting. The Timberland Venture 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 $227 million at June 30, 2015 and $217 million at December 31, 2014 , and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $227 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]
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	Variable Interest Entities Real Estate Development Ventures. MWV-Charleston Land Partners, LLC (“MWV-CLP”) 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 64,000 acres of high-value rural and development-quality lands ("Class B Properties"). MWV-CLP is managed by an affiliate of WestRock Company (formerly MeadWestvaco Corporation). 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 made an initial capital contribution of $152 million in 2013. Also, during the years 2014 to 2020, the Operating Partnership agreed to make additional capital contributions of at least $48 million in connection with its interest in the Class B Properties, of which $37 million remained outstanding as of June 30, 2015 . The Operating Partnership does not intend to provide any other sources of financing for MWV-CLP. The Operating Partnership accounts for its interest in MWV-CLP under the equity method of accounting. 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. WestRock Company 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. WestRock Company also has the ability to control all management decisions associated with the 22,000 acres of the 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 as of both June 30, 2015 and December 31, 2014 , 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 $37 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. 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, Plum Creek Ventures I, LLC (“PC Ventures”), a 100% wholly-owned subsidiary of Plum Creek Timber Company, Inc., 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. The Operating Partnership accounts for its interest in the Timberland Venture under the equity method of accounting. The Timberland Venture 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 $227 million at June 30, 2015 and $217 million at December 31, 2014 , and it is reported in the Consolidated Balance Sheets as Equity Investment in Timberland Venture. Our maximum exposure to loss is $227 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 .

Summarized Income Statement Inf

Summarized Income Statement Information of the Timberland Venture	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Summarized Income Statement Information of Affiliate	Summarized Income Statement Information of the Timberland Venture The earnings of the Timberland Venture are a significant component of consolidated earnings. See Note 12 of the Notes to Consolidated Financial Statements. Equity earnings for the Timberland Venture were $40 million for the six -month period ending June 30, 2015 and were $ 32 million for the six -month period ending June 30, 2014 . Equity earnings includes the amortization of the difference between the book value of the company’s investment and its proportionate share of the Timberland Venture’s net assets. For the six -month periods ended June 30, 2015 and June 30, 2014 , amortization of basis difference was $12 million and $ 4 million , respectively. Furthermore, interest expense in connection with the loan from the Timberland Venture was $29 million for each of the six -month periods ended June 30, 2015 and 2014 . The table below presents summarized income statement information for the Timberland Venture (in millions): Six Months Ended June 30, 2015 2014 Revenues $ 10 $ 10 Cost of Goods Sold (A) 9 9 Selling, General and Administrative Expenses 2 2 Operating Income (Loss) (1 ) (1 ) Interest Income, net 29 29 Net Income before Allocation to Preferred and Common Interests $ 28 $ 28 (A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $8 million for each of the six -month periods ended June 30, 2015 and 2014 .
PLUM CREEK TIMBERLANDS L P [Member]
Summarized Income Statement Information of Affiliate	Summarized Income Statement Information of the Timberland Venture The earnings of the Timberland Venture are a significant component of consolidated earnings. See Note 11 of the Notes to Consolidated Financial Statements. Equity earnings for the Timberland Venture were $40 million for the six -month period ending June 30, 2015 and were $ 32 million for the six -month period ending June 30, 2014 . Equity earnings includes the amortization of the difference between the book value of the Operating Partnership’s investment and its proportionate share of the Timberland Venture’s net assets. For the six -month periods ended June 30, 2015 and June 30, 2014 , amortization of basis difference was $12 million and $4 million , respectively. The table below presents summarized income statement information for the Timberland Venture (in millions): Six Months Ended June 30, 2015 2014 Revenues $ 10 $ 10 Cost of Goods Sold (A) 9 9 Selling, General and Administrative Expenses 2 2 Operating Income (Loss) (1 ) (1 ) Interest Income, net 29 29 Net Income before Allocation to Preferred and Common Interests $ 28 $ 28 (A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $8 million for each of the six -month periods ended June 30, 2015 and 2014 .

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Segment Information	Segment Information The tables below present information about reported segments for the quarterly and six -month periods ended June 30 (in millions): Northern Resources Southern Resources Real Estate Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Quarter Ended June 30, 2015 External Revenues $ 41 $ 129 $ 25 $ 92 $ 8 $ 7 $ 302 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 21 — 2 2 — 31 Basis of Real Estate Sold — — 9 — — — 9 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 2 2 Operating Income (Loss) 3 32 11 14 5 2 67 Quarter Ended June 30, 2014 External Revenues $ 44 $ 127 $ 77 $ 94 $ 9 $ 5 $ 356 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 19 — 6 2 — 33 Basis of Real Estate Sold — — 25 — — — 25 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (2 ) (2 ) Operating Income (Loss) 5 33 45 10 6 (3 ) 96 Northern Resources Southern Resources Real Estate (D) Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Six Months Ended June 30, 2015 External Revenues $ 105 $ 257 $ 134 $ 186 $ 16 $ 10 $ 708 Intersegment Revenues 12 — — — — — 12 Depreciation, Depletion and Amortization 13 41 — 5 4 — 63 Basis of Real Estate Sold — — 92 — — — 92 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 1 1 Operating Income (Loss) 16 63 30 23 10 1 143 Six Months Ended June 30, 2014 External Revenues $ 113 $ 250 $ 100 $ 184 $ 18 $ 8 $ 673 Intersegment Revenues 14 — — — — — 14 Depreciation, Depletion and Amortization 14 37 — 9 4 — 64 Basis of Real Estate Sold — — 31 — — — 31 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (3 ) (3 ) Operating Income (Loss) 21 64 57 19 12 (4 ) 169 (A) During the second quarter of 2014, we experienced a fire at our MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. For both the quarterly and six -month periods ended June 30, 2015 and June 30, 2014 , we recorded gains related to insurance recoveries of $2 million and $4 million , respectively. Insurance recoveries were received for costs incurred to rebuild or replace the damaged building and equipment and for business interruption costs. Both the building and equipment loss and the insurance recoveries are reported as Other Operating Gain in the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. (B) For segment reporting, Equity Earnings (Loss) from Real Estate Development Ventures is included in Operating Income (Loss) for the Other Segment. Equity earnings of $2 million and an equity loss of $2 million were recorded for the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and equity earnings of $1 million and an equity loss of $3 million were recorded for the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (C) Consolidated depreciation, depletion and amortization includes unallocated corporate expense of $1 million for each of the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and $2 million for each of the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (D) In January 2015, the company closed the second phase of a two-phase transaction with The Nature Conservancy, selling approximately 117,000 acres in Montana for $85 million . The first phase of the transaction, a sale of approximately 48,000 acres in Washington, closed in 2014. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal. A reconciliation of total segment operating income to income before income taxes is presented below for the quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Total Segment Operating Income $ 67 $ 96 Corporate and Other Unallocated Expenses (20 ) (17 ) Other Unallocated Operating Income (Expense), net — 1 Equity Earnings from Timberland Venture 17 17 Total Interest Expense, net (42 ) (42 ) Income before Income Taxes $ 22 $ 55 Six Months Ended June 30, 2015 2014 Total Segment Operating Income $ 143 $ 169 Corporate and Other Unallocated Expenses (39 ) (35 ) Other Unallocated Operating Income (Expense), net 3 2 Equity Earnings from Timberland Venture 40 32 Total Interest Expense, net (83 ) (83 ) Income before Income Taxes $ 64 $ 85
PLUM CREEK TIMBERLANDS L P [Member]
Segment Information	Segment Information The tables below present information about reported segments for the quarterly and six -month periods ended June 30 (in millions): Northern Resources Southern Resources Real Estate Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Quarter Ended June 30, 2015 External Revenues $ 41 $ 129 $ 25 $ 92 $ 8 $ 7 $ 302 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 21 — 2 2 — 31 Basis of Real Estate Sold — — 9 — — — 9 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 2 2 Operating Income (Loss) 3 32 11 14 5 2 67 Quarter Ended June 30, 2014 External Revenues $ 44 $ 127 $ 77 $ 94 $ 9 $ 5 $ 356 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 19 — 6 2 — 33 Basis of Real Estate Sold — — 25 — — — 25 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (2 ) (2 ) Operating Income (Loss) 5 33 45 10 6 (3 ) 96 Northern Resources Southern Resources Real Estate (D) Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Six Months Ended June 30, 2015 External Revenues $ 105 $ 257 $ 134 $ 186 $ 16 $ 10 $ 708 Intersegment Revenues 12 — — — — — 12 Depreciation, Depletion and Amortization 13 41 — 5 4 — 63 Basis of Real Estate Sold — — 92 — — — 92 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 1 1 Operating Income (Loss) 16 63 30 23 10 1 143 Six Months Ended June 30, 2014 External Revenues $ 113 $ 250 $ 100 $ 184 $ 18 $ 8 $ 673 Intersegment Revenues 14 — — — — — 14 Depreciation, Depletion and Amortization 14 37 — 9 4 — 64 Basis of Real Estate Sold — — 31 — — — 31 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (3 ) (3 ) Operating Income (Loss) 21 64 57 19 12 (4 ) 169 (A) During the second quarter of 2014, we experienced a fire at our MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. For both the quarterly and six -month periods ended June 30, 2015 and June 30, 2014 , we recorded gains related to insurance recoveries of $2 million and $4 million , respectively. Insurance recoveries were received for costs incurred to rebuild or replace the damaged building and equipment and for business interruption costs. Both the building and equipment loss and the insurance recoveries are reported as Other Operating Gain in the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. (B) For segment reporting, Equity Earnings (Loss) from Real Estate Development Ventures is included in Operating Income (Loss) for the Other Segment. Equity earnings of $2 million and an equity loss $2 million were recorded for the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and equity earnings of $1 million and an equity loss of $3 million were recorded for the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (C) Consolidated depreciation, depletion and amortization includes unallocated corporate expense of $1 million for each of the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and $2 million for each of the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (D) In January 2015, the Operating Partnership closed the second phase of a two-phase transaction with The Nature Conservancy, selling approximately 117,000 acres in Montana for $85 million . The first phase of the transaction, a sale of approximately 48,000 acres in Washington, closed in 2014. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal. A reconciliation of total segment operating income to income before income taxes is presented below for the quarterly and six -month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Total Segment Operating Income $ 67 $ 96 Corporate and Other Unallocated Expenses (20 ) (17 ) Other Unallocated Operating Income (Expense), net — 1 Equity Earnings from Timberland Venture 17 17 Interest Expense, net (27 ) (27 ) Income before Income Taxes $ 37 $ 70 Six Months Ended June 30, 2015 2014 Total Segment Operating Income $ 143 $ 169 Corporate and Other Unallocated Expenses (39 ) (35 ) Other Unallocated Operating Income (Expense), net 3 2 Equity Earnings from Timberland Venture 40 32 Interest Expense, net (54 ) (54 ) Income before Income Taxes $ 93 $ 114

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Subsequent Events [Text Block]	Subsequent Events Quarterly Dividend. On August 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 August 31, 2015 to stockholders of record on August 14, 2015 .

Supplemental Disclosures

Supplemental Disclosures	6 Months Ended
	Jun. 30, 2015
Supplemental Disclosures Abstract
Supplemental Disclosures	FINANCIAL STATEMENTS (CONTINUED) 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 June 30, 2015 , 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.

Basis of Presentation (Accounti

Basis of Presentation (Accounting Policies)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBERLANDS L P [Member]
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]	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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2015
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 quarterly and six-month periods ended June 30 (in millions, except per share amounts): Quarter Ended June 30, 2015 2014 Net Income Available to Common Stockholders $ 21 $ 55 Denominator for Basic Earnings per Share 175.5 177.1 Effect of Dilutive Securities – Stock Options 0.2 0.2 Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan — 0.1 Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities 175.7 177.4 Per Share Amounts: Net Income Per Share – Basic $ 0.12 $ 0.31 Net Income Per Share – Diluted $ 0.12 $ 0.31 Six Months Ended June 30, 2015 2014 Net Income Available to Common Stockholders $ 63 $ 85 Denominator for Basic Earnings per Share 175.7 177.1 Effect of Dilutive Securities – Stock Options 0.2 0.2 Effect of Dilutive Securities – Restricted Stock Units and Value Management Plan — 0.1 Denominator for Diluted Earnings per Share – Adjusted for Dilutive Securities 175.9 177.4 Per Share Amounts: Net Income Per Share - Basic $ 0.35 $ 0.48 Net Income Per Share - Diluted $ 0.35 $ 0.47

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Inventory [Line Items]
Schedule of Inventory, Current [Table Text Block]	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions): June 30, 2015 December 31, 2014 Raw Materials (primarily logs) $ 9 $ 12 Work-In-Process 3 3 Finished Goods 29 31 41 46 Supplies 15 15 Total $ 56 $ 61
PLUM CREEK TIMBERLANDS L P [Member]
Inventory [Line Items]
Schedule of Inventory, Current [Table Text Block]	Inventories, accounted for using the lower of average cost or market, consisted of the following (in millions): June 30, 2015 December 31, 2014 Raw Materials (primarily logs) $ 9 $ 12 Work-In-Process 3 3 Finished Goods 29 31 41 46 Supplies 15 15 Total $ 56 $ 61

Timber and Timberlands (Tables)

Timber and Timberlands (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands [Line Items]
Timber and Timberlands Tables	Timber and Timberlands consisted of the following (in millions): June 30, 2015 December 31, 2014 Timber and Logging Roads, net $ 2,490 $ 2,518 Timber Deeds, net 75 83 Timberlands 1,380 1,408 Timber and Timberlands, net $ 3,945 $ 4,009
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands [Line Items]
Timber and Timberlands Tables	Timber and Timberlands consisted of the following (in millions): June 30, 2015 December 31, 2014 Timber and Logging Roads, net $ 2,490 $ 2,518 Timber Deeds, net 75 83 Timberlands 1,380 1,408 Timber and Timberlands, net $ 3,945 $ 4,009

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	Property, Plant and Equipment consisted of the following (in millions): June 30, 2015 December 31, 2014 Land, Buildings and Improvements $ 99 $ 97 Machinery and Equipment 335 331 434 428 Accumulated Depreciation (316 ) (308 ) Property, Plant and Equipment, net $ 118 $ 120
PLUM CREEK TIMBERLANDS L P [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	Property, Plant and Equipment consisted of the following (in millions): June 30, 2015 December 31, 2014 Land, Buildings and Improvements $ 99 $ 97 Machinery and Equipment 335 331 434 428 Accumulated Depreciation (316 ) (308 ) Property, Plant and Equipment, net $ 118 $ 120

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Debt Instrument [Line Items]
Debt	Debt consisted of the following (in millions): June 30, 2015 December 31, 2014 Variable Rate Debt Term Credit Agreement (A) $ 225 $ 225 Revolving Line of Credit (B) 108 95 Fixed Rate Debt Senior Notes 1,330 1,330 Installment Note Payable 860 860 Note Payable to Timberland Venture 783 783 Total Debt 3,306 3,293 Less: Current Portion of Long-Term Debt 439 439 Line of Credit 108 95 Long-Term Portion $ 2,759 $ 2,759 (A) The company has a $225 million term credit agreement that matures on April 3, 2019 . The interest rate on the $225 million term credit agreement was 1.69% and 1.67% as of June 30, 2015 and December 31, 2014 , respectively. After giving effect to expected patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both June 30, 2015 and December 31, 2014 . (B) The weighted-average interest rate for the borrowings on the line of credit was 1.38% and 1.34% as of June 30, 2015 and December 31, 2014 , respectively. As of June 30, 2015 , we had $108 million of borrowings and $1 million of standby letters of credit outstanding; $591 million remained available for borrowing under our $700 million line of credit. As of July 1, 2015 , $73 million of the borrowings outstanding under our line of credit was repaid.
PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument [Line Items]
Debt	Debt consisted of the following (in millions): June 30, 2015 December 31, 2014 Variable Rate Debt Term Credit Agreement (A) $ 225 $ 225 Revolving Line of Credit (B) 108 95 Fixed Rate Debt Senior Notes 1,330 1,330 Installment Note Payable 860 860 Total Debt 2,523 2,510 Less: Current Portion of Long-Term Debt 439 439 Line of Credit 108 95 Long-Term Portion $ 1,976 $ 1,976 (A) The Operating Partnership has a $225 million term credit agreement that matures on April 3, 2019 . The interest rate on the $225 million term credit agreement was 1.69% and 1.67% as of June 30, 2015 and December 31, 2014 , respectively. After giving effect to expected patronage distributions, the effective net interest rate on the term loan was approximately 1% as of both June 30, 2015 and December 31, 2014 . (B) The weighted-average interest rate for the borrowings on the line of credit was 1.38% and 1.34% as of June 30, 2015 and December 31, 2014 , respectively. As of June 30, 2015 , we had $108 million of borrowings and $1 million of standby letters of credit outstanding; $591 million remained available for borrowing under our $700 million line of credit. As of July 1, 2015 , $73 million of the borrowings outstanding under our line of credit was repaid.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables) - PLUM CREEK TIMBER CO INC [Member]	6 Months Ended
	Jun. 30, 2015
Stockholders' Equity [Line Items]
Schedule of Stockholders Equity [Table Text Block]	The changes in the company’s stockholders’ equity accounts were as follows during 2015 (in millions): Common Stock Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Income (Loss) Shares Dollars Paid-in Capital Treasury Stock Total Equity January 1, 2015 175.9 $ 2 $ 2,955 $ (271 ) $ (992 ) $ (23 ) $ 1,671 Net Income 42 42 Other Comprehensive Income (Loss) (1 ) (1 ) Dividends (77 ) (77 ) Stock Option Exercises — — 1 1 Shares Issued under Stock Incentive Plans 0.2 — — — Share-based Compensation 3 3 Common Stock Repurchased (0.5 ) — (21 ) (21 ) March 31, 2015 175.6 $ 2 $ 2,959 $ (306 ) $ (1,013 ) $ (24 ) $ 1,618 Net Income 21 21 Other Comprehensive Income (Loss) 1 1 Dividends (78 ) (78 ) Share-based Compensation 2 2 Common Stock Repurchased (0.7 ) — (31 ) (31 ) June 30, 2015 174.9 $ 2 $ 2,961 $ (363 ) $ (1,044 ) $ (23 ) $ 1,533
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The changes in the company’s accumulated other comprehensive income (loss) by component, net of tax, were as follows during 2015 (in millions): Net Unrealized Holding Gain (Loss) (A) Defined Benefit Plan Actuarial Net Loss (B) Gain on Cash Flow Hedge Total January 1, 2015 $ 14 $ (42 ) $ 5 $ (23 ) Other Comprehensive Income (Loss) before Reclassifications (1 ) — — (1 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1 ) 1 — — March 31, 2015 $ 12 $ (41 ) $ 5 $ (24 ) Other Comprehensive Income (Loss) before Reclassifications — — — — Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1 — 1 June 30, 2015 $ 12 $ (40 ) $ 5 $ (23 ) (A) Unrealized holding gains are reclassified to Other Operating Income (Expense), net in the Consolidated Statements of Income when the related available for sale securities are sold. (B) Amortization of actuarial gains and losses on the company's defined benefit pension plans is included in the computation of pension cost. See Note 10 of the Notes to Consolidated Financial Statements.

Partners' Capital (Tables)

Partners' Capital (Tables) - PLUM CREEK TIMBERLANDS L P [Member]	6 Months Ended
	Jun. 30, 2015
Partners' Capital [Line Items]
Schedule Of Components Of Partners' Capital	The changes in the Operating Partnership’s capital accounts were as follows during 2015 (in millions): Preferred Partnership Interest Common Partners’ Capital Accumulated Other Comprehensive Income (Loss) Total Partnership Capital January 1, 2015 $ 790 $ 1,694 $ (23 ) $ 2,461 Net Income before Allocation to Series T-1 Preferred Interest and Partners 56 56 Other Comprehensive Income (Loss) (1 ) (1 ) Net Income Allocation to Series T-1 Preferred Interest 14 (14 ) — Distributions to Partners (Common Partnership Interests) (97 ) (97 ) Distributions for Series T-1 Preferred Interest (14 ) (14 ) Capital Contributions from Parent 3 3 March 31, 2015 $ 790 $ 1,642 $ (24 ) $ 2,408 Net Income before Allocation to Series T-1 Preferred Interest and Partners 36 36 Other Comprehensive Income (Loss) 1 1 Net Income Allocation to Series T-1 Preferred Interest 15 (15 ) — Distributions to Partners (Common Partnership Interests) (109 ) (109 ) Distributions for Series T-1 Preferred Interest (15 ) (15 ) Capital Contributions from Parent 2 2 June 30, 2015 $ 790 $ 1,556 $ (23 ) $ 2,323
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The changes in the Operating Partnership's accumulated other comprehensive income (loss) by component, net of tax, were as follows during 2015 (in millions): Net Unrealized Holding Gain (Loss) (A) Defined Benefit Plan Actuarial Net Loss (B) Gain on Cash Flow Hedge Total January 1, 2015 $ 14 $ (42 ) $ 5 $ (23 ) Other Comprehensive Income (Loss) before Reclassifications (1 ) — — (1 ) Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1 ) 1 — — March 31, 2015 $ 12 $ (41 ) $ 5 $ (24 ) Other Comprehensive Income (Loss) before Reclassifications — — — — Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) — 1 — 1 June 30, 2015 $ 12 $ (40 ) $ 5 $ (23 ) (A) Unrealized holding gains are reclassified to Other Operating Income (Expense), net in the Consolidated Statements of Income when the related available for sale securities are sold. (B) 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 9 of the Notes to Consolidated Financial Statements.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements) Cash Equivalents (A) $ 80 $ 80 Available-for-Sale Securities (B) 43 43 Trading Securities (B) 5 5 Total $ 128 $ 128 Balance at Fair Value Measurements 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 (A) Consists of several money market funds and is included in the $83 million and $92 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 , respectively. (B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 . At June 30, 2015 , 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 June 30, 2015 Carrying Amount at June 30, 2015 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Public Debt (A) $ 1,330 $ — $ 1,373 $ — $ 1,373 Term Credit Agreement (B) 225 — 225 — 225 Line of Credit (C) 108 — 108 — 108 Installment Note Payable (D) 860 — 891 — 891 Note Payable to Timberland Venture (E) 783 — — 890 890 Total Debt $ 3,306 $ — $ 2,597 $ 890 $ 3,487 Fair Value at December 31, 2014 Carrying Amount at Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total 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 (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.
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 at Reporting Date Using Quoted Prices in Active Markets of Identical Assets (Level 1 Measurements) Cash Equivalents (A) $ 80 $ 80 Available-for-Sale Securities (B) 43 43 Trading Securities (B) 5 5 Total $ 128 $ 128 Balance at Fair Value Measurements 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 (A) Consists of several money market funds and is included in the $83 million and $92 million of Cash and Cash Equivalents in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 , respectively. (B) Consists of several mutual funds and is included in Investment in Grantor Trusts in the Consolidated Balance Sheets at June 30, 2015 and December 31, 2014 . At June 30, 2015 , 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 June 30, 2015 Carrying Amount at June 30, 2015 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Public Debt (A) $ 1,330 $ — $ 1,373 $ — $ 1,373 Term Credit Agreement (B) 225 — 225 — 225 Line of Credit (C) 108 — 108 — 108 Installment Note Payable (D) 860 — 891 — 891 Total Debt $ 2,523 $ — $ 2,597 $ — $ 2,597 Fair Value at December 31, 2014 Carrying Amount at Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total 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 (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.

Employee Pension Plans (Tables)

Employee Pension Plans (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	The components of pension cost were as follows for the quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Service Cost $ 2 $ 2 Interest Cost 3 2 Expected Return on Plan Assets (3 ) (3 ) Recognized Actuarial Loss 1 1 Total Pension Cost $ 3 $ 2 Six Months Ended June 30, 2015 2014 Service Cost $ 4 $ 4 Interest Cost 5 4 Expected Return on Plan Assets (6 ) (5 ) Recognized Actuarial Loss 2 1 Total Pension Cost $ 5 $ 4
PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs [Table Text Block]	The components of pension cost were as follows for the quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Service Cost $ 2 $ 2 Interest Cost 3 2 Expected Return on Plan Assets (3 ) (3 ) Recognized Actuarial Loss 1 1 Total Pension Cost $ 3 $ 2 Six Months Ended June 30, 2015 2014 Service Cost $ 4 $ 4 Interest Cost 5 4 Expected Return on Plan Assets (6 ) (5 ) Recognized Actuarial Loss 2 1 Total Pension Cost $ 5 $ 4

Summarized Income Statement I35

Summarized Income Statement Information of the Timberland Venture (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments [Table Text Block]	The table below presents summarized income statement information for the Timberland Venture (in millions): Six Months Ended June 30, 2015 2014 Revenues $ 10 $ 10 Cost of Goods Sold (A) 9 9 Selling, General and Administrative Expenses 2 2 Operating Income (Loss) (1 ) (1 ) Interest Income, net 29 29 Net Income before Allocation to Preferred and Common Interests $ 28 $ 28 (A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $8 million for each of the six -month periods ended June 30, 2015 and 2014 .
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments [Table Text Block]	The table below presents summarized income statement information for the Timberland Venture (in millions): Six Months Ended June 30, 2015 2014 Revenues $ 10 $ 10 Cost of Goods Sold (A) 9 9 Selling, General and Administrative Expenses 2 2 Operating Income (Loss) (1 ) (1 ) Interest Income, net 29 29 Net Income before Allocation to Preferred and Common Interests $ 28 $ 28 (A) Cost of Goods Sold includes Depreciation, Depletion and Amortization of $8 million for each of the six -month periods ended June 30, 2015 and 2014 .

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2015
PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The tables below present information about reported segments for the quarterly and six -month periods ended June 30 (in millions): Northern Resources Southern Resources Real Estate Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Quarter Ended June 30, 2015 External Revenues $ 41 $ 129 $ 25 $ 92 $ 8 $ 7 $ 302 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 21 — 2 2 — 31 Basis of Real Estate Sold — — 9 — — — 9 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 2 2 Operating Income (Loss) 3 32 11 14 5 2 67 Quarter Ended June 30, 2014 External Revenues $ 44 $ 127 $ 77 $ 94 $ 9 $ 5 $ 356 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 19 — 6 2 — 33 Basis of Real Estate Sold — — 25 — — — 25 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (2 ) (2 ) Operating Income (Loss) 5 33 45 10 6 (3 ) 96 Northern Resources Southern Resources Real Estate (D) Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Six Months Ended June 30, 2015 External Revenues $ 105 $ 257 $ 134 $ 186 $ 16 $ 10 $ 708 Intersegment Revenues 12 — — — — — 12 Depreciation, Depletion and Amortization 13 41 — 5 4 — 63 Basis of Real Estate Sold — — 92 — — — 92 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 1 1 Operating Income (Loss) 16 63 30 23 10 1 143 Six Months Ended June 30, 2014 External Revenues $ 113 $ 250 $ 100 $ 184 $ 18 $ 8 $ 673 Intersegment Revenues 14 — — — — — 14 Depreciation, Depletion and Amortization 14 37 — 9 4 — 64 Basis of Real Estate Sold — — 31 — — — 31 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (3 ) (3 ) Operating Income (Loss) 21 64 57 19 12 (4 ) 169 (A) During the second quarter of 2014, we experienced a fire at our MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. For both the quarterly and six -month periods ended June 30, 2015 and June 30, 2014 , we recorded gains related to insurance recoveries of $2 million and $4 million , respectively. Insurance recoveries were received for costs incurred to rebuild or replace the damaged building and equipment and for business interruption costs. Both the building and equipment loss and the insurance recoveries are reported as Other Operating Gain in the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. (B) For segment reporting, Equity Earnings (Loss) from Real Estate Development Ventures is included in Operating Income (Loss) for the Other Segment. Equity earnings of $2 million and an equity loss of $2 million were recorded for the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and equity earnings of $1 million and an equity loss of $3 million were recorded for the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (C) Consolidated depreciation, depletion and amortization includes unallocated corporate expense of $1 million for each of the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and $2 million for each of the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (D) In January 2015, the company closed the second phase of a two-phase transaction with The Nature Conservancy, selling approximately 117,000 acres in Montana for $85 million . The first phase of the transaction, a sale of approximately 48,000 acres in Washington, closed in 2014. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal.
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 quarterly and six-month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Total Segment Operating Income $ 67 $ 96 Corporate and Other Unallocated Expenses (20 ) (17 ) Other Unallocated Operating Income (Expense), net — 1 Equity Earnings from Timberland Venture 17 17 Total Interest Expense, net (42 ) (42 ) Income before Income Taxes $ 22 $ 55 Six Months Ended June 30, 2015 2014 Total Segment Operating Income $ 143 $ 169 Corporate and Other Unallocated Expenses (39 ) (35 ) Other Unallocated Operating Income (Expense), net 3 2 Equity Earnings from Timberland Venture 40 32 Total Interest Expense, net (83 ) (83 ) Income before Income Taxes $ 64 $ 85
PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The tables below present information about reported segments for the quarterly and six -month periods ended June 30 (in millions): Northern Resources Southern Resources Real Estate Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Quarter Ended June 30, 2015 External Revenues $ 41 $ 129 $ 25 $ 92 $ 8 $ 7 $ 302 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 21 — 2 2 — 31 Basis of Real Estate Sold — — 9 — — — 9 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 2 2 Operating Income (Loss) 3 32 11 14 5 2 67 Quarter Ended June 30, 2014 External Revenues $ 44 $ 127 $ 77 $ 94 $ 9 $ 5 $ 356 Intersegment Revenues 6 — — — — — 6 Depreciation, Depletion and Amortization 6 19 — 6 2 — 33 Basis of Real Estate Sold — — 25 — — — 25 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (2 ) (2 ) Operating Income (Loss) 5 33 45 10 6 (3 ) 96 Northern Resources Southern Resources Real Estate (D) Manufacturing (A) Energy and Natural Resources Other (B) Total (C) Six Months Ended June 30, 2015 External Revenues $ 105 $ 257 $ 134 $ 186 $ 16 $ 10 $ 708 Intersegment Revenues 12 — — — — — 12 Depreciation, Depletion and Amortization 13 41 — 5 4 — 63 Basis of Real Estate Sold — — 92 — — — 92 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — 1 1 Operating Income (Loss) 16 63 30 23 10 1 143 Six Months Ended June 30, 2014 External Revenues $ 113 $ 250 $ 100 $ 184 $ 18 $ 8 $ 673 Intersegment Revenues 14 — — — — — 14 Depreciation, Depletion and Amortization 14 37 — 9 4 — 64 Basis of Real Estate Sold — — 31 — — — 31 Other Operating Gain — — — 2 — — 2 Equity Earnings (Loss) — — — — — (3 ) (3 ) Operating Income (Loss) 21 64 57 19 12 (4 ) 169 (A) During the second quarter of 2014, we experienced a fire at our MDF facility and recorded a $2 million loss representing the net book value of the building and equipment damaged or destroyed by the fire. For both the quarterly and six -month periods ended June 30, 2015 and June 30, 2014 , we recorded gains related to insurance recoveries of $2 million and $4 million , respectively. Insurance recoveries were received for costs incurred to rebuild or replace the damaged building and equipment and for business interruption costs. Both the building and equipment loss and the insurance recoveries are reported as Other Operating Gain in the Manufacturing Segment and are included in Other Operating Income (Expense), net in the Consolidated Statements of Income. (B) For segment reporting, Equity Earnings (Loss) from Real Estate Development Ventures is included in Operating Income (Loss) for the Other Segment. Equity earnings of $2 million and an equity loss $2 million were recorded for the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and equity earnings of $1 million and an equity loss of $3 million were recorded for the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (C) Consolidated depreciation, depletion and amortization includes unallocated corporate expense of $1 million for each of the quarterly periods ended June 30, 2015 and June 30, 2014 , respectively, and $2 million for each of the six -month periods ended June 30, 2015 and June 30, 2014 , respectively. (D) In January 2015, the Operating Partnership closed the second phase of a two-phase transaction with The Nature Conservancy, selling approximately 117,000 acres in Montana for $85 million . The first phase of the transaction, a sale of approximately 48,000 acres in Washington, closed in 2014. The total sales price of $131 million was allocated among the Montana and Washington properties based on an external appraisal.
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 quarterly and six -month periods ended June 30 (in millions): Quarter Ended June 30, 2015 2014 Total Segment Operating Income $ 67 $ 96 Corporate and Other Unallocated Expenses (20 ) (17 ) Other Unallocated Operating Income (Expense), net — 1 Equity Earnings from Timberland Venture 17 17 Interest Expense, net (27 ) (27 ) Income before Income Taxes $ 37 $ 70 Six Months Ended June 30, 2015 2014 Total Segment Operating Income $ 143 $ 169 Corporate and Other Unallocated Expenses (39 ) (35 ) Other Unallocated Operating Income (Expense), net 3 2 Equity Earnings from Timberland Venture 40 32 Interest Expense, net (54 ) (54 ) Income before Income Taxes $ 93 $ 114

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details) - Jun. 30, 2015 - a	Total
PLUM CREEK TIMBER CO INC [Member]
Basis of Presentation [Line Items]
Timber and Timberlands, net (acres)	6,400,000
Higher and better use timberlands, which are expected to be sold and/or developed, acres	675,000
Land Expect To Sell For Recreational Uses In Acres	500,000
Land Expect To Sell For Conservation In Acres	100,000
Land Designated With Development Potential In Acres	75,000
Total acres of non-strategic timberlands	225,000
Product conversion facilities owned in the Northwest United States	7
PLUM CREEK TIMBERLANDS L P [Member]
Basis of Presentation [Line Items]
Timber and Timberlands, net (acres)	6,400,000
Higher and better use timberlands, which are expected to be sold and/or developed, acres	675,000
Land Expect To Sell For Recreational Uses In Acres	500,000
Land Expect To Sell For Conservation In Acres	100,000
Land Designated With Development Potential In Acres	75,000
Total acres of non-strategic timberlands	225,000
Product conversion facilities owned in the Northwest United States	7
Percentage Of Ownership	100.00%

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net Income Available to Common Stockholders	$ 21	$ 55	$ 63	$ 85
Denominator for Basic Earnings per Share	175.5	177.1	175.7	177.1
Effect of Dilutive Securities - Stock Options	0.2	0.2	0.2	0.2
Effect of Dilutive Securities - Restricted Stock Units and Value Management Plan	0	0.1	0	0.1
Denominator for Diluted Earnings per Share - Adjusted for Dilutive Securities	175.7	177.4	175.9	177.4
Net Income per Share-Basic	$ 0.12	$ 0.31	$ 0.35	$ 0.48
Net Income per Share-Diluted	$ 0.12	$ 0.31	$ 0.35	$ 0.47

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Inventory [Line Items]
Raw Materials (primarily logs)	$ 9	$ 12
Work-In-Process	3	3
Finished Goods	29	31
Inventory Raw Materials Finished Goods And Work In Process	41	46
Supplies	15	15
Total	56	61
PLUM CREEK TIMBERLANDS L P [Member]
Inventory [Line Items]
Raw Materials (primarily logs)	9	12
Work-In-Process	3	3
Finished Goods	29	31
Inventory Raw Materials Finished Goods And Work In Process	41	46
Supplies	15	15
Total	$ 56	$ 61

Timber and Timberlands (Timber

Timber and Timberlands (Timber and Timberlands Table) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Timber and Timberlands [Line Items]
Timber and Logging Roads, net	$ 2,490	$ 2,518
Timber Deeds, net	75	83
Timberlands	1,380	1,408
Timber and Timberlands, net	3,945	4,009
PLUM CREEK TIMBERLANDS L P [Member]
Timber and Timberlands [Line Items]
Timber and Logging Roads, net	2,490	2,518
Timber Deeds, net	75	83
Timberlands	1,380	1,408
Timber and Timberlands, net	$ 3,945	$ 4,009

Property, Plant and Equipment41

Property, Plant and Equipment (Property, Plant and Equipment Table) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Property, Plant and Equipment [Line Items]
Land, Buildings and Improvements	$ 99	$ 97
Machinery and Equipment	335	331
Property, Plant and Equipment, gross	434	428
Accumulated Depreciation	(316)	(308)
Property, Plant and Equipment, net	118	120
PLUM CREEK TIMBERLANDS L P [Member]
Property, Plant and Equipment [Line Items]
Land, Buildings and Improvements	99	97
Machinery and Equipment	335	331
Property, Plant and Equipment, gross	434	428
Accumulated Depreciation	(316)	(308)
Property, Plant and Equipment, net	$ 118	$ 120

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - Jun. 30, 2015 - USD ($) $ in Millions	Total
PLUM CREEK TIMBER CO INC [Member]
Income Tax Examination [Line Items]
Tax Liability from Potential Adjustment	$ 100
Gain from Potential Tax Adjustment	$ 600
Percentage of Gain Distributed in Common Stock	80.00%
PLUM CREEK TIMBERLANDS L P [Member]
Income Tax Examination [Line Items]
Tax Liability from Potential Adjustment	$ 100
Gain from Potential Tax Adjustment	$ 600
Percentage of Gain Distributed in Common Stock	80.00%

Borrowings (Schedule of Debt In

Borrowings (Schedule of Debt Information) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2008
PLUM CREEK TIMBER CO INC [Member]
Debt Instrument [Line Items]
Senior Notes		$ 1,330		$ 1,330
Installment Note Payable		860		860
Note Payable to Timberland Venture		783		783	$ 783
Long-term Debt		3,306		3,293
Current Portion of Long-Term Debt		439		439
Line of Credit		108		95
Long Term Portion Of Total Borrowings		2,759		2,759
Line of Credit Facility, Decrease, Repayments		203	$ 1,063
PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument [Line Items]
Senior Notes		1,330		1,330
Installment Note Payable		860		860
Long-term Debt		2,523		2,510
Current Portion of Long-Term Debt		439		439
Line of Credit		108		95
Long Term Portion Of Total Borrowings		1,976		1,976
Line of Credit Facility, Decrease, Repayments		203	$ 1,063
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument [Line Items]
Line of Credit		108		$ 95
Letters of Credit Outstanding, Amount		1
Line of Credit, Remained Available		591
Line of Credit Capacity		$ 700
Debt, Weighted Average Interest Rate		1.38%		1.34%
Line of Credit [Member] | PLUM CREEK TIMBER CO INC [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Decrease, Repayments	$ 73
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument [Line Items]
Line of Credit		$ 108		$ 95
Letters of Credit Outstanding, Amount		1
Line of Credit, Remained Available		591
Line of Credit Capacity		$ 700
Debt, Weighted Average Interest Rate		1.38%		1.34%
Line of Credit [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Decrease, Repayments	$ 73
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 225		$ 225
Term Credit Agreement, Interest		1.69%		1.67%
Effective Interest Rate, Percentage		1.00%		1.00%
Debt Instrument, Maturity Date		Apr. 3, 2019
Term Credit Agreement 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 225		$ 225
Term Credit Agreement, Interest		1.69%		1.67%
Effective Interest Rate, Percentage		1.00%		1.00%
Debt Instrument, Maturity Date		Apr. 3, 2019

Stockholders' Equity (Schedule

Stockholders' Equity (Schedule Of Components Of Stockholders Equity) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	$ 21		$ 55	$ 63	$ 85
PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance Shares		175.9		175.9
Beginning Balance	1,618	$ 1,671		$ 1,671
Net Income	21	42	55	63	85
Other Comprehensive Income (Loss), net of tax	1	(1)	$ (1)	$ 0	$ 0
Dividends	(78)	(77)
Stock Option Exercises		1
Shares Issued under Stock Incentive Plans		0
Share-based Compensation	2	3
Common Stock Repurchased	$ (31)	(21)
Ending Balance Shares	174.9			174.9
Ending Balance	$ 1,533	$ 1,618		$ 1,533
Common Stock [Member] | PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance Shares	175.6	175.9		175.9
Beginning Balance	$ 2	$ 2		$ 2
Stock Option Exercises (in shares)		0
Stock Option Exercises		$ 0
Shares Issued under Stock Incentive Plans (shares)		0.2
Shares Issued under Stock Incentive Plans		$ 0
Stock Repurchased During Period, Shares	(0.7)	(0.5)
Common Stock Repurchased	$ 0	$ 0
Ending Balance Shares	174.9	175.6		174.9
Ending Balance	$ 2	$ 2		$ 2
Paid-in Capital [Member] | PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,959	2,955		2,955
Stock Option Exercises		1
Shares Issued under Stock Incentive Plans		0
Share-based Compensation	2	3
Ending Balance	2,961	2,959		2,961
Retained Earnings (Accumulated Deficit) [Member] | PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(306)	(271)		(271)
Net Income	21	42
Dividends	(78)	(77)
Ending Balance	(363)	(306)		(363)
Treasury Stock [Member] | PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,013)	(992)		(992)
Common Stock Repurchased	(31)	(21)
Ending Balance	(1,044)	(1,013)		(1,044)
Accumulated Other Comprehensive Income (Loss) [Member] | PLUM CREEK TIMBER CO INC [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(24)	(23)		(23)
Other Comprehensive Income (Loss), net of tax	1	(1)
Ending Balance	$ (23)	$ (24)		$ (23)

Stockholders' Equity Accumulate

Stockholders' Equity Accumulated Other Comprehensive Income (Details) - PLUM CREEK TIMBER CO INC [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (24)	$ (23)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	0
Ending Balance	(23)	(24)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	12	14
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(1)
Ending Balance	12	12
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(41)	(42)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	1
Ending Balance	(40)	(41)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	5	5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Ending Balance	$ 5	$ 5

Partners' Capital (Schedule Of

Partners' Capital (Schedule Of Components Of Partners' Capital) (Details) - PLUM CREEK TIMBERLANDS L P [Member] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balances	$ 2,408	$ 2,461		$ 2,461
Net Income before Allocation to Series T-1 Preferred Interest and Partners	36	56	$ 70	92	$ 114
Other Comprehensive Income (Loss), net of tax	1	(1)	$ (1)	0	0
Net Income Allocation to Series T-1 Preferred Interest	0	0
Distributions to Partners (Common Partnership Interests)	(109)	(97)		(206)	(157)
Distributions for Series T-1 Preferred Interest	(15)	(14)		(29)	$ (29)
Capital Contributions from Parent	2	3
Ending Balances	2,323	2,408		2,323
Preferred Partnership Interest [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balances	790	790		790
Net Income Allocation to Series T-1 Preferred Interest	15	14
Distributions for Series T-1 Preferred Interest	(15)	(14)
Ending Balances	790	790		790
Common Partners' Capital [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balances	1,642	1,694		1,694
Net Income before Allocation to Series T-1 Preferred Interest and Partners	36	56
Net Income Allocation to Series T-1 Preferred Interest	(15)	(14)
Distributions to Partners (Common Partnership Interests)	(109)	(97)
Capital Contributions from Parent	2	3
Ending Balances	1,556	1,642		1,556
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balances	(24)	(23)		(23)
Other Comprehensive Income (Loss), net of tax	1	(1)
Ending Balances	$ (23)	$ (24)		$ (23)

Partners' Capital Accumulated O

Partners' Capital Accumulated Other Comprehensive Income (Details) - PLUM CREEK TIMBERLANDS L P [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ (24)	$ (23)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	0
Ending Balance	(23)	(24)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	12	14
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	(1)
Ending Balance	12	12
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(41)	(42)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	1
Ending Balance	(40)	(41)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	5	5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Ending Balance	$ 5	$ 5

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 ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 83	$ 92	$ 107	$ 433
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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 83	92	$ 107	$ 433
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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	$ 80	90
Available-for-Sale Securities	43	43
Trading Securities	5	5
Total	128	138
Fair Value, Measurements, Recurring [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	80	90
Available-for-Sale Securities	43	43
Trading Securities	5	5
Total	128	138
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	80	90
Available-for-Sale Securities	43	43
Trading Securities	5	5
Total	128	138
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	80	90
Available-for-Sale Securities	43	43
Trading Securities	5	5
Total	$ 128	$ 138

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 31	$ 31
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Amortized Cost Basis	31	31
Categories of Investments, Marketable Securities, Trading Securities [Member] | PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Obligations Included in Other Liabilities	5	5
Categories of Investments, Marketable Securities, Trading Securities [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Obligations Included in Other Liabilities	$ 5	$ 5

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value, Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2008
PLUM CREEK TIMBER CO INC [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	$ 1,330	$ 1,330
Debt Instrument, Fair Value Disclosure	3,487	3,516
Line of Credit, Current	108	95
Installment Note Payable	860	860
Note Payable to Timberland Venture	783	783	$ 783
Long-term Debt	3,306	3,293
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	2,597	2,624
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	890	892
PLUM CREEK TIMBERLANDS L P [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	1,330	1,330
Debt Instrument, Fair Value Disclosure	2,597	2,624
Line of Credit, Current	108	95
Installment Note Payable	860	860
Long-term Debt	2,523	2,510
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	2,597	2,624
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	1,330
Debt Instrument, Fair Value Disclosure	1,373	1,398
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	1,373	1,398
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	1,330
Debt Instrument, Fair Value Disclosure	1,373	1,398
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	1,373	1,398
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]
Debt Instrument, Fair Value Disclosure	225	225
Long-term Debt	225	225
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	225
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]
Debt Instrument, Fair Value Disclosure	225	225
Long-term Debt	225	225
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	225
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, Current	108	95
Lines of Credit, Fair Value Disclosure	108	95
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	108	95
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, Current	108	95
Lines of Credit, Fair Value Disclosure	108	95
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	108	95
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	860
Notes Payable, Fair Value Disclosure	891	906
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	891	906
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	860
Notes Payable, Fair Value Disclosure	891	906
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	891	906
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	890	892
Note Payable to Timberland Venture	783	783
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	$ 890	$ 892

Employee Pension Plans (Compone

Employee Pension Plans (Component of Pension Cost Recognized in Net Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 2	$ 2	$ 4	$ 4
Interest Cost	3	2	5	4
Expected Return on Plan Assets	(3)	(3)	(6)	(5)
Recognized Actuarial Loss	1	1	2	1
Total Pension Cost	3	2	5	4
PLUM CREEK TIMBERLANDS L P [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	2	2	4	4
Interest Cost	3	2	5	4
Expected Return on Plan Assets	(3)	(3)	(6)	(5)
Recognized Actuarial Loss	1	1	2	1
Total Pension Cost	$ 3	$ 2	$ 5	$ 4

Variable Interest Entities (Det

Variable Interest Entities (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015USD ($)a	Dec. 31, 2013USD ($)	Dec. 31, 2008USD ($)a	Dec. 31, 2014USD ($)
PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	75,000
Equity Investment in Real Estate Development Ventures	$ 126			$ 126
Amount borrowed from the Timberland Venture	783		$ 783	783
Equity Investment in Timberland Venture	$ 227			217
PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	75,000
Equity Investment in Real Estate Development Ventures	$ 126			126
Proceeds from Partnership Contribution			783
Equity Investment in Timberland Venture	227			$ 217
PC Ventures [Member]
Variable Interest Entity [Line Items]
Amount borrowed from the Timberland Venture			$ 783
Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	227
Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	$ 227
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	22,000
Equity Method Investment, Ownership Percentage	4.00%
MWV-CLP (Class A Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	22,000
Equity Method Investment, Ownership Percentage	4.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	64,000
Variable Interest Entity, Financial or Other Support, Amount		$ 48
Additional Capital Contributions Outstanding	$ 37
Variable Interest Entity, Financial or Other Support, Period Committed	6 years
Equity Method Investment, Ownership Percentage	50.00%
MWV-CLP (Class B Properties) [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Land Designated With Development Potential In Acres | a	64,000
Variable Interest Entity, Financial or Other Support, Amount		48
Additional Capital Contributions Outstanding	$ 37
Variable Interest Entity, Financial or Other Support, Period Committed	6 years
Equity Method Investment, Ownership Percentage	50.00%
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Equity Method Investments		152
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Equity Method Investments		$ 152
MWV-CLP [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	$ 126
MWV-CLP [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss	126
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Variable Interest Entity [Line Items]
Contributed Acres of Timberlands to Venture | a			454,000
Preferred Interest in Venture			$ 705
Common Interest in Venture (Percent)			9.00%
Common Interest in Venture			$ 78
Proceeds from Partnership Contribution			$ 783
Other Partnership Ownership Percentage			91.00%
Total Common Interests in Venture	861
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Variable Interest Entity [Line Items]
Contributed Acres of Timberlands to Venture | a			454,000
Preferred Interest in Venture			$ 705
Common Interest in Venture (Percent)			9.00%
Common Interest in Venture			$ 78
Proceeds from Partnership Contribution			$ 783
Other Partnership Ownership Percentage			91.00%
Total Common Interests in Venture	$ 861

Summarized Income Statement I53

Summarized Income Statement Information of the Timberland Venture (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	$ 19	$ 15	$ 41	$ 29
Amortization of Basis Difference			12	4
Interest Expense, Related Party	15	15	29	29
Revenues			10	10
Cost of Goods Sold			9	9
Selling, General and Administrative Expenses			2	2
Operating Income (Loss)			(1)	(1)
Interest Income, net			29	29
Net Income before Allocation to Preferred and Common Interests			28	28
Depreciation, Depletion and Amortization included in Cost of Goods Sold			8	8
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	19	15	41	29
Amortization of Basis Difference			12	4
Revenues			10	10
Cost of Goods Sold			9	9
Selling, General and Administrative Expenses			2	2
Operating Income (Loss)			(1)	(1)
Interest Income, net			29	29
Net Income before Allocation to Preferred and Common Interests			28	28
Depreciation, Depletion and Amortization included in Cost of Goods Sold			8	8
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	17	17	40	32
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	$ 17	$ 17	$ 40	$ 32

Segment Information (Summary of

Segment Information (Summary of Reported Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
External Revenues	$ 302	$ 356	$ 708	$ 673
Depreciation, Depletion and Amortization			65	66
Basis of Real Estate Sold			92	31
Earnings from Unconsolidated Entities	19	15	41	29
Operating Income (Loss)	45	82	106	139
PLUM CREEK TIMBER CO INC [Member] | Northern Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	41	44	105	113
Intersegment Revenues	6	6	12	14
Depreciation, Depletion and Amortization	6	6	13	14
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	3	5	16	21
PLUM CREEK TIMBER CO INC [Member] | Southern Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	129	127	257	250
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	21	19	41	37
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	32	33	63	64
PLUM CREEK TIMBER CO INC [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
External Revenues	25	77	134	100
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	0	0	0	0
Basis of Real Estate Sold	9	25	92	31
Other Operating Gain	0	0	0	0
Operating Income (Loss)	11	45	30	57
PLUM CREEK TIMBER CO INC [Member] | Manufacturing [Member]
Segment Reporting Information [Line Items]
External Revenues	92	94	186	184
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	2	6	5	9
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	2	2	2	2
Operating Income (Loss)	14	10	23	19
PLUM CREEK TIMBER CO INC [Member] | Energy and Natural Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	8	9	16	18
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	2	2	4	4
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	5	6	10	12
PLUM CREEK TIMBER CO INC [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
External Revenues	7	5	10	8
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	0	0	0	0
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	2	(3)	1	(4)
PLUM CREEK TIMBER CO INC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
External Revenues	302	356	708	673
Intersegment Revenues	6	6	12	14
Depreciation, Depletion and Amortization	31	33	63	64
Basis of Real Estate Sold	9	25	92	31
Other Operating Gain	2	2	2	2
Operating Income (Loss)	67	96	143	169
PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
External Revenues	302	356	708	673
Depreciation, Depletion and Amortization			65	66
Basis of Real Estate Sold			92	31
Earnings from Unconsolidated Entities	19	15	41	29
Operating Income (Loss)	45	82	106	139
PLUM CREEK TIMBERLANDS L P [Member] | Northern Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	41	44	105	113
Intersegment Revenues	6	6	12	14
Depreciation, Depletion and Amortization	6	6	13	14
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	3	5	16	21
PLUM CREEK TIMBERLANDS L P [Member] | Southern Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	129	127	257	250
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	21	19	41	37
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	32	33	63	64
PLUM CREEK TIMBERLANDS L P [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
External Revenues	25	77	134	100
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	0	0	0	0
Basis of Real Estate Sold	9	25	92	31
Other Operating Gain	0	0	0	0
Operating Income (Loss)	11	45	30	57
PLUM CREEK TIMBERLANDS L P [Member] | Manufacturing [Member]
Segment Reporting Information [Line Items]
External Revenues	92	94	186	184
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	2	6	5	9
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	2	2	2	2
Operating Income (Loss)	14	10	23	19
PLUM CREEK TIMBERLANDS L P [Member] | Energy and Natural Resources [Member]
Segment Reporting Information [Line Items]
External Revenues	8	9	16	18
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	2	2	4	4
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	5	6	10	12
PLUM CREEK TIMBERLANDS L P [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
External Revenues	7	5	10	8
Intersegment Revenues	0	0	0	0
Depreciation, Depletion and Amortization	0	0	0	0
Basis of Real Estate Sold	0	0	0	0
Other Operating Gain	0	0	0	0
Operating Income (Loss)	2	(3)	1	(4)
PLUM CREEK TIMBERLANDS L P [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
External Revenues	302	356	708	673
Intersegment Revenues	6	6	12	14
Depreciation, Depletion and Amortization	31	33	63	64
Basis of Real Estate Sold	9	25	92	31
Other Operating Gain	2	2	2	2
Operating Income (Loss)	67	96	143	169
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Northern Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Southern Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Manufacturing [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Energy and Natural Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Northern Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Southern Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Manufacturing [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Energy and Natural Resources [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	$ 2	$ (2)	$ 1	$ (3)

Segment Information (Narrative)

Segment Information (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)a	Jun. 30, 2014USD ($)	Dec. 31, 2014a
PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
MDF Fire Impairment Loss				$ 2
Land Sales	$ 25	$ 77	$ 134	100
Depreciation, Depletion and Amortization			65	66
Earnings from Unconsolidated Entities	19	15	41	29
PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
MDF Fire Impairment Loss				2
Land Sales	25	77	134	100
Depreciation, Depletion and Amortization			65	66
Earnings from Unconsolidated Entities	19	15	41	29
Other Segments [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	0	0	0	0
Other Segments [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	0	0	0	0
Corporate Segment [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	1	1	2	2
Corporate Segment [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	1	1	2	2
Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
MDF Fire Impairment Loss		2		2
Insurance Recoveries	2	4	2	4
Depreciation, Depletion and Amortization	2	6	5	9
Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
MDF Fire Impairment Loss		2		2
Insurance Recoveries	2	4	2	4
Depreciation, Depletion and Amortization	2	6	5	9
MWV-CLP [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | Other Segments [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | Other Segments [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	2	(2)	1	(3)
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	0	0	0	0
MWV-CLP [Member] | Manufacturing [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Earnings from Unconsolidated Entities	$ 0	$ 0	0	$ 0
Montana TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Land Sales			$ 85
Land Dispositions (Acres) | a			117,000
Montana TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Land Sales			$ 85
Land Dispositions (Acres) | a			117,000
Washington TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Land Dispositions (Acres) | a					48,000
Washington TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Land Dispositions (Acres) | a					48,000
Total TNC Sale [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting Information [Line Items]
Land Sales			$ 131
Total TNC Sale [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting Information [Line Items]
Land Sales			$ 131

Segment Information (Reconcilia

Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 45	$ 82	$ 106	$ 139
Earnings from Unconsolidated Entities	19	15	41	29
Total Interest Expense, net	(42)	(42)	(83)	(83)
Income before Income Taxes	22	55	64	85
PLUM CREEK TIMBER CO INC [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	67	96	143	169
PLUM CREEK TIMBER CO INC [Member] | Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	(20)	(17)	(39)	(35)
PLUM CREEK TIMBER CO INC [Member] | Other Unallocated Operating Income Expense Net [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	0	1	3	2
PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	45	82	106	139
Earnings from Unconsolidated Entities	19	15	41	29
Total Interest Expense, net	(27)	(27)	(54)	(54)
Income before Income Taxes	37	70	93	114
PLUM CREEK TIMBERLANDS L P [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	67	96	143	169
PLUM CREEK TIMBERLANDS L P [Member] | Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	(20)	(17)	(39)	(35)
PLUM CREEK TIMBERLANDS L P [Member] | Other Unallocated Operating Income Expense Net [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	0	1	3	2
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings from Unconsolidated Entities	17	17	40	32
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings from Unconsolidated Entities	$ 17	$ 17	$ 40	$ 32

Subsequent Events (Details)

Subsequent Events (Details) - Aug. 04, 2015 - Subsequent Event [Member] - PLUM CREEK TIMBER CO INC [Member] - USD ($) $ / shares in Units, $ in Millions	Total
Dividends Payable [Line Items]
Dividend Payment per Share	$ 0.44
Dividend Payment, Approximately	$ 77

Supplemental Disclosures (Detai

Supplemental Disclosures (Details) $ in Millions	Jun. 30, 2015USD ($)
PLUM CREEK TIMBERLANDS L P [Member]
Supplemental Disclosures [Line Items]
Senior Notes Short and Long Term Aggregate	$ 1,333