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Equity Method Investments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
USG Boral Building Products [Member]
Feb. 27, 2014
USG Boral Building Products [Member]
Jun. 30, 2014
Other Equity Method Investments [Member]
Dec. 31, 2013
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]            
Transaction costs included in equity method investment carrying value     $ 31      
Equity method investments $ 755 $ 73 $ 704 $ 676 $ 51 $ 73
Ownership percentage of equity method investment     50.00% 50.00%