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INVENTORIES - Inventories as of the End of Our Last Two Years (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Total $ 595us-gaap_InventoryNet $ 542us-gaap_InventoryNet
Logs and chips    
Inventory [Line Items]    
LIFO inventories 9us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
15us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
FIFO or moving average cost inventories 38wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
33wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
Lumber, plywood and panels    
Inventory [Line Items]    
LIFO inventories 55us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodandPanelsMember
46us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodandPanelsMember
Lumber, plywood, panels and engineered wood products    
Inventory [Line Items]    
FIFO or moving average cost inventories 80wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodPanelsAndEngineeredLumberMember
70wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodPanelsAndEngineeredLumberMember
Pulp and paperboard    
Inventory [Line Items]    
LIFO inventories 122us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
97us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
FIFO or moving average cost inventories 35wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
30wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
Other products    
Inventory [Line Items]    
LIFO inventories 11us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
11us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
FIFO or moving average cost inventories 96wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
94wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
Materials and supplies    
Inventory [Line Items]    
FIFO or moving average cost inventories $ 149wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryRawMaterialsandSuppliesMember
$ 146wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryRawMaterialsandSuppliesMember