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(Loss) Earnings Per Share
 9 Months Ended
Sep. 30, 2012
Loss Earnings Per Share Disclosure [Abstract]  
Earnings Per Share
(Loss)/Earnings Per Share

Basic (loss)/earnings per common share is computed by dividing net (loss)/earnings less accumulated preferred stock dividends by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the year are weighted for the portion of the year that they were outstanding. Diluted (loss)/earnings per share is computed in a manner consistent with that of basic (loss)/earnings per share while giving effect to all potentially dilutive common shares that were outstanding during the period.

The reconciliation of NRG's basic and diluted (loss)/earnings per share is shown in the following table:
 
Three months ended September 30,
 
Nine months ended September 30,
(In millions, except per share data)
2012
 
2011
 
2012
 
2011
Basic (loss)/earnings per share attributable to NRG common stockholders
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net (loss)/income attributable to NRG Energy, Inc.
$
(1
)
 
$
(55
)
 
$
43

 
$
306

Preferred stock dividends
(2
)
 
(2
)
 
(7
)
 
(7
)
Net (loss)/income attributable to NRG Energy, Inc. available to common stockholders
$
(3
)
 
$
(57
)
 
$
36

 
$
299

Denominator:
 
 
 
 
 
 
 
Weighted average number of common shares outstanding
228

 
240

 
228

 
243

Basic (loss)/earnings per share:
 
 
 
 
 
 
 
Net (loss)/income attributable to NRG Energy, Inc.
$
(0.01
)
 
$
(0.24
)
 
$
0.16

 
$
1.23

Diluted (loss)/earnings per share attributable to NRG common stockholders
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net (loss)/income attributable to NRG Energy, Inc. available to common shareholders
$
(3
)
 
$
(57
)
 
$
36

 
$
299

Denominator:
 
 
 
 
 
 
 
Weighted average number of common shares outstanding
228

 
240

 
228

 
243

Incremental shares attributable to the issuance of equity compensation (treasury stock method)
—

 
—

 
2

 
2

Total dilutive shares
228

 
240

 
230

 
245

Diluted (loss)/earnings per share:
 
 
 
 
 
 
 
Net (loss)/income attributable to NRG Energy, Inc.
$
(0.01
)
 
$
(0.24
)
 
$
0.16

 
$
1.22


The following table summarizes NRG’s outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company’s diluted (loss)/earnings per share:
 
Three months ended September 30,
 
Nine months ended September 30,
(In millions of shares)
2012
 
2011
 
2012
 
2011
Equity compensation plans
11

 
7

 
6

 
7

Embedded derivative of 3.625% redeemable perpetual preferred stock
16

 
16

 
16

 
16

Total
27

 
23

 
22

 
23