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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Schedule of segment reporting information, by segment
 
Retail(a)
 
Generation(a)
 
Corporate(a)
 
Eliminations
 
Total
Three months ended September 30, 2018
(In millions)
Operating revenues(a)
$
2,203

 
$
1,579

 
$
1

 
$
(722
)
 
$
3,061

Depreciation and amortization
30

 
73

 
7

 
2

 
112

Reorganization costs
6

 
3

 
18

 
—

 
27

Gain on sale of assets
—

 
—

 
14

 
—

 
14

Equity in earnings of unconsolidated affiliates
—

 
20

 
2

 
(2
)
 
20

Loss on debt extinguishment, net
—

 
—

 
(19
)
 
—

 
(19
)
(Loss)/income from continuing operations before income taxes
(127
)
 
595

 
349

 
(504
)
 
313

(Loss)/income from continuing operations
(127
)
 
595

 
342

 
(504
)
 
306

Loss from discontinued operations, net of tax
—

 
—

 
(354
)
 
—

 
(354
)
Net (Loss)/Income
(127
)
 
595

 
(12
)
 
(504
)
 
(48
)
(Loss)/Income attributable to NRG Energy, Inc. common stockholders
$
(127
)
 
$
579

 
$
(23
)
 
$
(501
)
—

$
(72
)
Total assets as of September 30, 2018
$
3,465

 
$
6,699

 
$
7,979

 
$
(6,693
)
 
$
11,450

(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
1

 
$
740

 
$
(19
)
 
$
—

 
$
722

 
Retail(a)
 
Generation(a)
 
Corporate(a)
 
Eliminations
 
Total
Three months ended September 30, 2017
(In millions)
Operating revenues(a)
$
1,936

 
$
1,313

 
$
—

 
$
(509
)
 
$
2,740

Depreciation and amortization
28

 
128

 
8

 
(1
)
 
163

Reorganization costs
5

 
3

 
4

 
—

 
12

Equity in earnings of unconsolidated affiliates
—

 
9

 
3

 
(3
)
 
9

Income/(loss) from continuing operations before income taxes
72

 
272

 
(157
)
 
(1
)
 
186

Income/(loss) from continuing operations
72

 
272

 
(158
)
 
(1
)
 
185

Loss from discontinued operations, net of tax
—

 
—

 
(22
)
 
—

 
(22
)
Net Income/(Loss)
72

 
272

 
(180
)
 
(1
)
 
163

Net Income/(Loss) attributable to NRG Energy, Inc. common stockholders
$
72

 
$
256

 
$
(159
)
 
$
2

 
$
171

(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
3

 
$
493

 
$
13

 
$
—

 
$
509


 
Retail(a)
 
Generation(a)
 
Corporate(a)
 
Eliminations
 
Total
Nine months ended September 30, 2018
(In millions)
Operating revenues(a)
$
5,497

 
$
3,216

 
$
10

 
$
(928
)
 
$
7,795

Depreciation and amortization
86

 
259

 
25

 
—

 
370

Impairment losses
—

 
74

 
—

 
—

 
74

Reorganization costs
10

 
10

 
50

—

—

 
70

Gain on sale of assets
—

 
1

 
29

 
—

 
30

Equity in earnings of unconsolidated affiliates
—

 
27

 
4

 
(5
)
 
26

Loss on debt extinguishment, net
—

 
—

 
(22
)
 
—

 
(22
)
Income/(Loss) from continuing operations before income taxes
733

 
303

 
812

 
(1,228
)
 
620

Income/(Loss) from continuing operations
733

 
302

 
794

 
(1,228
)
 
601

Loss from discontinued operations, net of tax
—

 
—

 
(320
)
 
—

 
(320
)
Net Income/(Loss)
733

 
302

 
474

 
(1,228
)
 
281

Net Income/(Loss) attributable to NRG Energy, Inc. common stockholders
$
732

 
$
293

 
$
479

 
$
(1,224
)
 
$
280

(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
7

 
$
944

 
$
(23
)
 
$
—

 
$
928

 
Retail (a)
 
Generation(a)
 
Corporate(a)
 
Eliminations
 
Total
Nine months ended September 30, 2017
 
 
 
 
 
 
 
 
 
Operating revenues(a)
$
4,868

 
$
3,289

 
$
13

 
$
(924
)
 
$
7,246

Depreciation and amortization
81

 
385

 
26

 
(2
)
 
490

Impairment losses
—

 
60

 
—

 
—

 
60

Reorganization costs
5

 
3

 
10

—

—

 
18

Gain on sale of assets
—

 
4

 
—

 
—

 
4

Equity in (losses)/earnings of unconsolidated affiliates
—

 
(21
)
 
6

 
(5
)
 
(20
)
Income/(loss) from continuing operations before income taxes
371

 
185

 
(433
)
 
(4
)
 
119

Income/(loss) from continuing operations
380

 
183

 
(443
)
 
(4
)
 
116

Loss from discontinued operations, net of tax
—

 
—

 
(798
)
 
—

 
(798
)
Net Income/(loss)
380

 
183

 
(1,241
)
 
(4
)
 
(682
)
Net Income/(loss) attributable to NRG Energy, Inc. common stockholders
$
380

 
$
169

 
$
(1,169
)
 
$
1

 
$
(619
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
3

 
$
872

 
$
49

 
$
—

 
$
924