Commitments and Contingencies Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2014
PLUM CREEK TIMBER CO INC [Member]
Loss Contingencies [Line Items]
MDF Fire Impairment Loss	$ 2
Insurance Recoveries	4
Insured Event, Gain (Loss)	2
PLUM CREEK TIMBERLANDS L P [Member]
Loss Contingencies [Line Items]
MDF Fire Impairment Loss	2
Insurance Recoveries	4
Insured Event, Gain (Loss)	2
Minimum [Member] | PLUM CREEK TIMBER CO INC [Member]
Loss Contingencies [Line Items]
Estimated Insurance Recovery from Third Party	8
Minimum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Loss Contingencies [Line Items]
Estimated Insurance Recovery from Third Party	8
Maximum [Member] | PLUM CREEK TIMBER CO INC [Member]
Loss Contingencies [Line Items]
Estimated Insurance Recovery from Third Party	12
Maximum [Member] | PLUM CREEK TIMBERLANDS L P [Member]
Loss Contingencies [Line Items]
Estimated Insurance Recovery from Third Party	$ 12