Summarized Income Statement Information of the Timberland Venture (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	$ 15	$ 17	$ 29		$ 31
Amortization of Basis Difference			4		4
Interest Expense, Related Party	15	15	29		29
Revenues			10		8
Cost of Goods Sold			9	[1]	7	[1]
Selling, General and Administrative Expenses			2		3
Operating Income (Loss)			(1)		(2)
Interest Income, net			29		29
Net Income before Allocation to Preferred and Common Interests			28		27
Depreciation, Depletion and Amortization included in Cost of Goods Sold			8		7
PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	15	17	29		31
Amortization of Basis Difference			4		4
Revenues			10		8
Cost of Goods Sold			9	[1]	7	[1]
Selling, General and Administrative Expenses			2		3
Operating Income (Loss)			(1)		(2)
Interest Income, net			29		29
Net Income before Allocation to Preferred and Common Interests			28		27
Depreciation, Depletion and Amortization included in Cost of Goods Sold			8		7
Timberland Venture [Member] | PLUM CREEK TIMBER CO INC [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	17	17	32		31
Timberland Venture [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Schedule of Equity Method Investments [Line Items]
Earnings from Unconsolidated Entities	$ 17	$ 17	$ 32		$ 31

[1] Cost of Goods Sold includes Depreciation, Depletion and Amortization of $8 million and $7 million for the six-month periods ended June 30, 2014 and 2013, respectively.