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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
The reconciliation of basic income per share to diluted income per share is shown in the following table:
(millions, except per-share data)
2015
 
2014
 
2013
Income from continuing operations
$
991

 
$
39

 
$
48

Net income (loss) attributable to noncontrolling interest
—

 
1

 
$
(1
)
Income from continuing operations attributable to USG
$
991

 
$
38

 
$
49

Loss from discontinued operations
—

 
(1
)
 
(2
)
Net income attributable to USG
$
991

 
$
37

 
$
47

Effect of dilutive securities - Deferred compensation program for non-employee directors
(1
)
 
—

 
—

Income available to shareholders
$
990

 
$
37

 
$
47

 
 
 
 
 
 
Average common shares
145.5

 
141.7

 
108.9

Dilutive RSUs, MSUs, performance shares and stock options
1.6

 
2.4

 
2.5

Deferred shares associated with a deferred compensation program for non-employee directors
0.1

 
0.2

 
—

Average diluted common shares
147.2

 
144.3

 
111.4

 
 
 
 
 
 
Basic earnings (loss) per average common share:
 
 
 
 
 
Income from continuing operations attributable to USG
$
6.81

 
$
0.27

 
$
0.45

Loss from discontinued operations
—

 
(0.01
)
 
(0.02
)
Net income attributable to USG
$
6.81

 
$
0.26

 
$
0.43

 
 
 
 
 
 
Diluted earnings (loss) per average common share:
 
 
 
 
 
Income from continuing operations attributable to USG
$
6.73

 
$
0.26

 
$
0.44

Loss from discontinued operations
—

 
(0.01
)
 
(0.02
)
Net income attributable to USG
$
6.73

 
$
0.25

 
$
0.42


Stock options, RSUs, MSUs, performance shares, common shares issuable upon conversion of our 10% convertible senior notes and deferred shares associated with our deferred compensation program for non-employee directors 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)
2015
 
2014
 
2013
Stock options, RSUs, MSUs and performance shares
1.9

 
2.1

 
2.2

10% convertible senior notes due 2018 (a)
—

 
—

 
6.6

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

 
—

 
0.2

(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.