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INVENTORIES - Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Total $ 645us-gaap_InventoryNet $ 595us-gaap_InventoryNet
Logs and chips    
Inventory [Line Items]    
LIFO inventories 20us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
9us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
FIFO or moving average cost inventories 48wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
38wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LogsAndChipsMember
Lumber, plywood and panels    
Inventory [Line Items]    
LIFO inventories 74us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodandPanelsMember
55us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodandPanelsMember
Lumber, plywood, panels and engineered wood products    
Inventory [Line Items]    
FIFO or moving average cost inventories 85wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodPanelsAndEngineeredLumberMember
80wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_LumberPlywoodPanelsAndEngineeredLumberMember
Pulp and paperboard    
Inventory [Line Items]    
LIFO inventories 128us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
122us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
FIFO or moving average cost inventories 34wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
35wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_PulpAndPaperboardMember
Other products    
Inventory [Line Items]    
LIFO inventories 15us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
11us-gaap_LIFOInventoryAmount
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
FIFO or moving average cost inventories 92wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryOtherProductsMember
96wy_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
$ 149wy_FIFOandMovingAverageCostMethodsInventories
/ us-gaap_PublicUtilitiesInventoryAxis
= wy_InventoryRawMaterialsandSuppliesMember