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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of segment reporting information, by segment
 
Retail(a)
 
Generation(a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Three months ended June 30, 2018
(In millions)
Operating revenues(a)
$
1,817

 
$
1,218

 
$
113

 
$
307

 
$
7

 
$
(540
)
 
$
2,922

Depreciation and amortization
31

 
66

 
40

 
82

 
8

 
—

 
227

Impairment losses
—

 
74

 
—

 
—

 
—

 
—

 
74

Reorganization costs
1

 
3

 
3

 
—

 
16

 
—

 
23

Equity in earnings/(losses) of unconsolidated affiliates
—

 
—

 
5

 
29

 
—

 
(16
)
 
18

(Loss)/income from continuing operations before income taxes
(84
)
 
273

 
(17
)
 
103

 
(134
)
 
(12
)
 
129

(Loss)/income from continuing operations
(84
)
 
272

 
(12
)
 
96

 
(139
)
 
(12
)
 
121

Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(25
)
 
—

 
(25
)
Net (Loss)/Income
(84
)
 
272

 
(12
)
 
96

 
(164
)
 
(12
)
 
96

(Loss)/Income attributable to NRG Energy, Inc.
$
(88
)
 
$
272

 
$
(35
)
 
$
73


$
(244
)
 
$
94

 
$
72

Total assets as of June 30, 2018
$
7,217

 
$
4,306

 
$
4,117

 
$
8,448

 
$
9,675

 
$
(10,816
)
 
$
22,947

(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
2

 
$
546

 
$
9

 
$
—

 
$
(17
)
 
$
—

 
$
540

 
Retail(a)
 
Generation(a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Three months ended June 30, 2017
(In millions)
Operating revenues(a)
$
1,603

 
$
882

 
$
119

 
$
288

 
$
3

 
$
(194
)
 
$
2,701

Depreciation and amortization
29

 
95

 
49

 
79

 
8

 
—

 
260

Impairment losses
—

 
41

 
22

 
—

 
—

 
—

 
63

Equity in (losses)/earnings of unconsolidated affiliates
—

 
(15
)
 
(2
)
 
16

 
3

 
(5
)
 
(3
)
Income/(loss) from continuing operations before income taxes
330

 
(89
)
 
(51
)
 
52

 
(134
)
 
(5
)
 
103

Income/(loss) from continuing operations
341

 
(90
)
 
(46
)
 
44

 
(145
)
 
(5
)
 
99

Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(741
)
 
—

 
(741
)
Net Income/(Loss)
341

 
(90
)
 
(46
)
 
44

 
(886
)
 
(5
)
 
(642
)
Net Income/(Loss) attributable to NRG Energy, Inc.
$
341

 
$
(90
)
 
$
(21
)
 
$
38

 
$
(919
)
 
$
25

 
$
(626
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
1

 
$
171

 
$
3

 
$
—

 
$
19

 
$
—

 
$
194


 
Retail(a)
 
Generation(a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Six months ended June 30, 2018
(In millions)
Operating revenues(a)
$
3,298

 
$
1,545

 
$
199

 
$
532

 
$
9

 
$
(240
)
 
$
5,343

Depreciation and amortization
59

 
133

 
90

 
163

 
17

 
—

 
462

Impairment losses
—

 
74

 
—

 
—

 
—

 
—

 
74

Reorganization costs
4

 
7

 
3

 
—

 
29

 
—

 
43

Equity in earnings/(losses) of unconsolidated affiliates
—

 
2

 
5

 
33

 
(1
)
 
(23
)
 
16

Income/(Loss) from continuing operations before income taxes
861

 
(264
)
 
(56
)
 
102

 
(260
)
 
(22
)
 
361

Income/(Loss) from continuing operations
861

 
(265
)
 
(45
)
 
96

 
(271
)
 
(22
)
 
354

Income from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(25
)
 
—

 
(25
)
Net Income/(Loss)
861

 
(265
)
 
(45
)
 
96

 
(296
)
 
(22
)
 
329

Net Income/(Loss) attributable to NRG Energy, Inc.
$
851

 
$
(265
)
 
$
(33
)
 
$
94

 
$
(392
)
 
$
96

 
$
351

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

 
$
239

 
$
17

 
$
—

 
$
(19
)
 
$
—

 
$
240

 
Retail (a)
 
Generation(a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Six months ended June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating revenues(a)
$
2,938

 
$
1,848

 
$
213

 
$
509

 
$
11

 
$
(436
)
 
$
5,083

Depreciation and amortization
57

 
192

 
96

 
156

 
16

 
—

 
517

Impairment losses
—

 
41

 
22

 
—

 
—

 
—

 
63

Equity in (losses)/earnings of unconsolidated affiliates
—

 
(28
)
 
(3
)
 
35

 
7

 
(9
)
 
2

Income/(loss) from continuing operations before income taxes
303

 
(52
)
 
(87
)
 
49

 
(275
)
 
(9
)
 
(71
)
Income/(loss) from continuing operations
311

 
(54
)
 
(77
)
 
42

 
(283
)
 
(9
)
 
(70
)
Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(775
)
 
—

 
(775
)
Net Income/(loss)
311

 
(54
)
 
(77
)
 
42

 
(1,058
)
 
(9
)
 
(845
)
Net Income/(loss) attributable to NRG Energy, Inc.
$
311

 
$
(54
)
 
$
(24
)
 
$
50

 
$
(1,091
)
 
$
18

 
$
(790
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
11

 
$
406

 
$
4

 
$
—

 
$
15

 
$
—

 
$
436