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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Reconciliation of basic income (loss) per share to diluted income (loss) per share
The reconciliation of basic income (loss) per share to diluted income (loss) per share is shown in the following table:
(millions, except per-share data)
2014
 
2013
 
2012
Income (loss) from continuing operations
$
39

 
$
48

 
$
(182
)
Net income (loss) attributable to noncontrolling interest
1

 
(1
)
 
$
1

Income (loss) from continuing operations attributable to USG
$
38

 
$
49

 
$
(183
)
Income (loss) from discontinued operations
(1
)
 
(2
)
 
2

Gain on sale of discontinued operations
—

 
—

 
55

Net income (loss) attributable to USG
$
37

 
$
47

 
$
(126
)
Effect of dilutive securities - RSUs, MSUs, performance shares and stock options
—

 
—

 
—

Effect of dilutive securities - 10% convertible senior notes
—

 
—

 
—

Effect of dilutive securities - Deferred compensation program for non-employee directors
—

 
—

 
—

Income (loss) available to shareholders
$
37

 
$
47

 
$
(126
)
 
 
 
 
 
 
Average common shares
141.7

 
108.9

 
106.4

Dilutive RSUs, MSUs, performance shares and stock options
2.4

 
2.5

 
—

Common shares issuable upon conversion of our 10% convertible senior notes
—

 
—

 
—

Deferred shares associated with a deferred compensation program for non-employee directors
0.2

 
—

 
—

Average diluted common shares
144.3

 
111.4

 
106.4

 
 
 
 
 
 
Basic earnings (loss) per average common share:
 
 
 
 
 
Income (loss) from continuing operations attributable to USG
$
0.27

 
$
0.45

 
$
(1.72
)
Income (loss) from discontinued operations
(0.01
)
 
(0.02
)
 
0.53

Net income (loss) attributable to USG
$
0.26

 
$
0.43

 
$
(1.19
)
 
 
 
 
 
 
Diluted earnings (loss) per average common share:
 
 
 
 
 
Income (loss) from continuing operations attributable to USG
$
0.26

 
$
0.44

 
$
(1.72
)
Income (loss) from discontinued operations
(0.01
)
 
(0.02
)
 
0.53

Net income (loss) attributable to USG
$
0.25

 
$
0.42

 
$
(1.19
)
Schedule of ant-dilutive securities excluded from computation of diluted earnings (loss) per share
Stock options, RSUs, MSUs, performance shares and common shares issuable upon conversion of our 10% convertible senior notes that were not included in the computation of diluted earnings (loss) per share for those periods because their inclusion was anti-dilutive were as follows:
(millions, common shares)
2014
 
2013
 
2012
Stock options, RSUs, MSUs and performance shares
2.1

 
2.2

 
7.9

10% convertible senior notes due 2018 (a)
—

 
6.6

 
35.1

(a)
In December 2013 and April 2014, we converted $325 million and $75 million, respectively, of our 10% convertible senior notes due 2018 into common shares. See further discussion in Note 7.