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Supplemental Balance Sheet Information (Details Textual) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Ocean_vessel
Dec. 31, 2014
Supplemental Balance Sheet Information [Abstract]    
Interest accrued on debt $ 36us-gaap_InterestPayableCurrentAndNoncurrent $ 45us-gaap_InterestPayableCurrentAndNoncurrent
Self-unloading ocean vessels 2usg_SelfunloadingOceanVessels  
Self-unloading ocean vessels    
Supplemental Balance Sheet Information [Abstract]    
Assets held for sale 35us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= usg_SelfunloadingoceanvesselsMember		  
Indefinite-lived intangible assets    
Supplemental Balance Sheet Information [Abstract]    
Assets held for sale   $ 5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis
= us-gaap_IndefinitelivedIntangibleAssetsMember