XML 126 R113.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segments (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Restructuring charges $ 0us-gaap_RestructuringCharges $ 3us-gaap_RestructuringCharges $ 10us-gaap_RestructuringCharges
Percentage of major customer net sales     15.00%us-gaap_ConcentrationRiskPercentage1
Net Sales | Home Depot      
Segment Reporting Information [Line Items]      
Percentage of major customer net sales 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= usg_HomeDepotMember		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= usg_HomeDepotMember		  
USG Boral Building Products | USG Boral Building Products      
Segment Reporting Information [Line Items]      
Restructuring charges $ 2us-gaap_RestructuringCharges
/ invest_InvestmentAxis
= usg_USGBoralBuildingProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= usg_USGBoralBuildingProductsMember