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Unaudited Quarterly Financial Data (Notes)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Data
Unaudited Quarterly Financial Data
Refer to Note 3, Business Acquisitions and Dispositions, and Note 10, Asset Impairments, for a description of the effect of unusual or infrequently occurring events during the quarterly periods. Summarized unaudited quarterly financial data is as follows:
 
Quarter Ended
 
2016
 
December 31
 
September 30
 
June 30
 
March 31
 
(In millions, except per share data)
Operating revenues
$
2,532

 
$
3,952

 
$
2,638

 
$
3,229

Operating (loss)/income
(791
)
 
755

 
87

 
476

Net (loss)/income
(1,055
)
 
393

 
(276
)
 
47

Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests
(68
)
 
(9
)
 
(5
)
 
(35
)
Net (loss)/income attributable to NRG Energy, Inc. 
(987
)
 
402

 
(271
)
 
82

(Loss)/income available to Common Stockholders
$
(987
)
 
$
402

 
$
(193
)
 
$
77

Weighted average number of common shares outstanding — basic
316

 
316

 
315

 
315

Net (loss)/income per weighted average common share — basic
$
(3.13
)
 
$
1.27

 
$
(0.61
)
 
$
0.24

Weighted average number of common shares outstanding — diluted
316

 
317

 
315

 
315

Net (loss)/income per weighted average common share — diluted
$
(3.13
)
 
$
1.27

 
$
(0.61
)
 
$
0.24

 
Quarter Ended
 
2015
 
December 31
 
September 30
 
June 30
 
March 31
 
(In millions, except per share data)
Operating revenues
$
3,011

 
$
4,434

 
$
3,400

 
$
3,829

Operating (loss)/income
(4,727
)
 
379

 
232

 
76

Net (loss)/income
(6,358
)
 
67

 
(9
)
 
(136
)
Less: Net (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests
(44
)
 
1

 
5

 
(16
)
Net (loss)/income attributable to NRG Energy, Inc. 
(6,314
)
 
66

 
(14
)
 
(120
)
(Loss)/income available to Common Stockholders
$
(6,319
)
 
$
61

 
$
(19
)
 
$
(125
)
Weighted average number of common shares outstanding — basic
315

 
331

 
333

 
336

Net (loss)/income per weighted average common share — basic
$
(20.08
)
 
$
0.18

 
$
(0.06
)
 
$
0.37

Weighted average number of common shares outstanding — diluted
315

 
332

 
333

 
336

Net (loss)/income per weighted average common share — diluted
$
(20.08
)
 
$
0.18

 
$
(0.06
)
 
$
(0.37
)