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Quarterly Financial Information (unaudited) Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Quarter (a)
 
(millions, except share data)
First
 
Second
 
Third
 
Fourth
 
2012
 
 
 
 
 
 
 
 
Net sales
$
783

 
$
798

 
$
828

 
$
815

  
Gross profit
102

 
102

 
106

 
85

  
Operating profit (loss)
24

 
28

 
29

 
(8
)
(c)
Loss from continuing operations
(29
)
 
(59
)
 
(30
)
 
(64
)
(c)
Income (loss) from discontinued operations, net of tax
2

 
2

 
1

 
(3
)
 
Gain on sale of discontinued operations, net of tax
—

 
—

 
—

 
55

 
Net loss attributable to USG
(27
)
 
(57
)
 
(29
)
 
(13
)
(c)
Loss from continuing operations per common share:
 
 
 
 
 
 
 
 
Basic (b)
(0.28
)
 
(0.55
)
 
(0.29
)
 
(0.59
)
 
Diluted (b)
(0.28
)
 
(0.55
)
 
(0.29
)
 
(0.59
)
 
2011
 
 
 
 
 
 
 
 
Net sales
$
688

 
$
733

 
$
763

 
$
726

  
Gross profit
28

 
46

 
46

 
38

  
Operating loss
(61
)
 
(23
)
 
(79
)
 
(43
)
(d)
Loss from continuing operations
(107
)
 
(72
)
 
(117
)
 
(100
)
(d)
Income from discontinued operations, net of tax
2

 
2

 
2

 
—

 
Net loss attributable to USG
(105
)
 
(70
)
 
(115
)
 
(100
)
(d)
Loss from continuing operations per common share:
 
 
 
 
 
 
 
 
Basic (b)
(1.03
)
 
(0.70
)
 
(1.11
)
 
(0.95
)
 
Diluted (b)
(1.03
)
 
(0.70
)
 
(1.11
)
 
(0.95
)