Equity Method Investments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 5	$ 1	$ 8	$ 1
USG Boral Building Products [Member]
Schedule of Equity Method Investments [Line Items]
Net sales	280		369
Gross profit	80		102
Operating profit	16		26
Net income	10		17
Net income attributable to USG Boral Building Products	9		15
Income from equity method investments	4		7
Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 1	$ 1	$ 1	$ 1