Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 85	$ 102
PLUM CREEK TIMBER CO INC [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	85	102
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization	66	51
Basis of Real Estate Sold	31	42
Earnings from Unconsolidated Entities	(29)	(31)
Distributions from Timberland Venture	28	27
Deferred Income Taxes	0	(1)
Deferred Revenue from Long-Term Gas Leases (Net of Amortization)	(2)	(4)
Timber Deed Acquired	0	(18)
Other Working Capital Changes	7	(40)
Other	3	12
Net Cash Provided By (Used In) Operating Activities	189	140
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures (Excluding Timberland Acquisitions)	(40)	(31)
Timberlands Acquired	0	(78)
Contribution to Real Estate Development Ventures	(4)	0
Distributions from Real Estate Development Ventures	1	0
Net Cash Provided By (Used In) Investing Activities	(43)	(109)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends	(156)	(140)
Borrowings on Line of Credit	748	721
Repayments on Line of Credit	(1,063)	(472)
Principal Payments and Retirement of Long-Term Debt	0	(174)
Proceeds from Stock Option Exercises	1	35
Acquisition of Treasury Stock	(2)	(2)
Net Cash Provided By (Used In) Financing Activities	(472)	(32)
Increase (Decrease) In Cash and Cash Equivalents	(326)	(1)
Cash and Cash Equivalents:
Beginning of Period	433	356
End of Period	107	355
PLUM CREEK TIMBERLANDS L P [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	85	102
Net Income before Allocation to Series T-1 Preferred Interest and Partners	114	131
Adjustments to Reconcile Net Income to Net Cash Provided By Operating Activities:
Depreciation, Depletion and Amortization	66	51
Basis of Real Estate Sold	31	42
Earnings from Unconsolidated Entities	(29)	(31)
Distributions from Timberland Venture	28	27
Deferred Income Taxes	0	(1)
Deferred Revenue from Long-Term Gas Leases (Net of Amortization)	(2)	(4)
Timber Deed Acquired	0	(18)
Other Working Capital Changes	7	(40)
Other	3	12
Net Cash Provided By (Used In) Operating Activities	218	169
CASH FLOWS FROM INVESTING ACTIVITIES
Capital Expenditures (Excluding Timberland Acquisitions)	(40)	(31)
Timberlands Acquired	0	(78)
Contribution to Real Estate Development Ventures	(4)	0
Distributions from Real Estate Development Ventures	1	0
Net Cash Provided By (Used In) Investing Activities	(43)	(109)
CASH FLOWS FROM FINANCING ACTIVITIES
Cash Distributions to Common Partners	(157)	(107)
Cash Distributions for Series T-1 Preferred Interest	(29)	(29)
Borrowings on Line of Credit	748	721
Repayments on Line of Credit	(1,063)	(472)
Principal Payments and Retirement of Long-Term Debt	0	(174)
Net Cash Provided By (Used In) Financing Activities	(501)	(61)
Increase (Decrease) In Cash and Cash Equivalents	(326)	(1)
Cash and Cash Equivalents:
Beginning of Period	433	356
End of Period	$ 107	$ 355