Inventories (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
PLUM CREEK TIMBER CO INC [Member]
Inventory [Line Items]
Raw Materials (primarily logs)	$ 8	$ 9
Work-In-Process	2	2
Finished Goods	27	30
Inventory Raw Materials Finished Goods And Work In Process	37	41
Supplies	14	14
Total	51	55
PLUM CREEK TIMBERLANDS L P [Member]
Inventory [Line Items]
Raw Materials (primarily logs)	8	9
Work-In-Process	2	2
Finished Goods	27	30
Inventory Raw Materials Finished Goods And Work In Process	37	41
Supplies	14	14
Total	$ 51	$ 55