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Earnings /Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of NRG's basic and diluted earnings per share
The reconciliation of NRG's basic earnings/(loss) per share to diluted earnings/(loss) per share is shown in the following table:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In millions, except per share amounts)
Basic and diluted loss per share attributable to NRG common stockholders
 
 
 
 
 
Net loss attributable to NRG Energy, Inc.
$
(2,153
)
 
$
(774
)
 
$
(6,382
)
Dividends for preferred shares
—

 
5

 
20

Gain on redemption of 2.822% redeemable perpetual preferred shares
—

 
(78
)
 
—

Loss Available to Common Stockholders
$
(2,153
)
 
$
(701
)

$
(6,402
)
Weighted average number of common shares outstanding
317


316


329

Loss per weighted average common share — basic and diluted
$
(6.79
)
 
$
(2.22
)
 
$
(19.46
)
Summary of NRG's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted earnings per share
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 per share:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In millions of shares)
Equity compensation
5

 
5

 
6

Embedded derivative of 2.822% redeemable perpetual preferred stock
—

 
—

 
16

Total
5

 
5

 
22