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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Schedule of segment reporting information, by segment
 
Generation(a)
 
Retail (a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Three months ended June 30, 2017
(In millions)
Operating revenues(a)
$
882

 
$
1,603

 
$
123

 
$
284

 
$
3

 
$
(194
)
 
$
2,701

Depreciation and amortization
95

 
29

 
50

 
78

 
8

 
—

 
260

Impairment losses
41

 
—

 
22

 
—

 
—

 
—

 
63

Equity in (losses)/earnings of unconsolidated affiliates
(15
)
 
—

 
(2
)
 
16

 
3

 
(5
)
 
(3
)
(Loss)/income from continuing operations before income taxes
(89
)
 
330

 
(52
)
 
53

 
(135
)
 
(4
)
 
103

(Loss)/income from continuing operations
(90
)
 
341

 
(47
)
 
45

 
(146
)
 
(4
)
 
99

Loss from discontinued operations, net of tax
—

 
—

 
—

 
—



(741
)
 
—

 
(741
)
Net (Loss)/Income
(90
)
 
341


(47
)
 
45

 
(887
)
 
(4
)
 
(642
)
Net (Loss)/income attributable to NRG Energy, Inc.
$
(90
)
 
$
341

 
$
(22
)
 
$
50

—

$
(920
)
 
$
15

 
$
(626
)
Total assets as of June 30, 2017
$
8,539

 
$
2,439

 
$
5,193

 
$
8,513

 
$
10,954

 
$
(10,433
)
 
$
25,205

(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
171

 
$
1

 
$
10

 
$
3

 
$
9

 
$
—

 
$
194

 
Generation(a)
 
Retail(a)
 
Renewables(a)
 
NRG Yield(a)
 
Corporate(a)
 
Eliminations
 
Total
Three months ended June 30, 2016
(In millions)
Operating revenues(a)
$
504

 
$
1,536

 
$
101

 
$
283

 
$
10

 
$
(186
)
 
$
2,248

Depreciation and amortization
97

 
29

 
47

 
75

 
14

 
—

 
262

Impairment losses
17

 
—

 
27

 
—

 
12

 
—

 
56

Equity in earnings/(losses) of unconsolidated affiliates
2

 
—

 
(2
)
 
14

 
27

 
(37
)
 
4

Loss on sale of assets
—

 
—

 
—

 
—

 
(83
)
 
—

 
(83
)
Loss on debt extinguishment, net
—

 
—

 
—

 
—

 
(80
)
 
—

 
(80
)
(Loss)/income from continuing operations before income taxes
(458
)
 
657

 
(75
)
 
76

 
(295
)
 
(43
)
 
(138
)
(Loss)/income from continuing operations
(458
)
 
657

 
(71
)
 
64

 
(312
)
 
(43
)
 
(163
)
Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(113
)
 
—

 
(113
)
Net (Loss)/Income
(458
)
 
657

 
(71
)
 
64

 
(425
)
 
(43
)
 
(276
)
Net (Loss)/Income attributable to NRG Energy, Inc.
$
(458
)
 
$
661

 
$
(66
)
 
$
48

 
$
(449
)
 
$
(7
)
 
$
(271
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
166

 
$
1

 
$
4

 
$
2

 
$
13

 
$
—

 
$
186



 
Generation(a)
 
Retail (a)
 
Renewables(a)(b)
 
NRG Yield
 
Corporate(a)
 
Eliminations
 
Total
Six months ended June 30, 2017
(In millions)
Operating revenues(a)
$
1,848

 
$
2,938

 
$
220

 
$
502

 
$
11

 
$
(436
)
 
$
5,083

Depreciation and amortization
192

 
57

 
99

 
153

 
16

 
—

 
517

Impairment losses
41

 
—

 
22

 
—

 
—

 
—

 
63

Equity in (losses)/earnings of unconsolidated affiliates
(28
)
 
—

 
(3
)
 
35

 
7

 
(9
)
 
2

(Loss)/income from continuing operations before income taxes
(54
)
 
303

 
(89
)
 
51

 
(273
)
 
(9
)
 
(71
)
(Loss)/Income from continuing operations
(56
)
 
311

 
(79
)
 
44

 
(281
)
 
(9
)
 
(70
)
Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(775
)
 
—

 
(775
)
Net (Loss)/Income
(56
)
 
311

 
(79
)
 
44

 
(1,056
)
 
(9
)
 
(845
)
Net (Loss)/Income attributable to NRG Energy, Inc.
$
(56
)
 
$
311

 
$
(26
)
 
$
58

 
$
(1,089
)
 
$
12

 
$
(790
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
406

 
$
11

 
$
4

 
$
—

 
$
15

 
$
—

 
$
436

 
Generation(a)(c)
 
Retail(a)
 
Renewables(a)
 
NRG Yield(a)
 
Corporate(a)
 
Eliminations
 
Total
Six months ended June 30, 2016
(In millions)
Operating revenues(a)
$
1,637

 
$
2,906

 
$
197

 
$
517

 
$
28

 
$
(378
)
 
$
4,907

Depreciation and amortization
197

 
57

 
95

 
149

 
30

 
—

 
528

Impairment losses
17

 
—

 
27

 
—

 
12

 
—

 
56

Equity in (losses)/earnings of unconsolidated affiliates
(5
)
 
—

 
(8
)
 
18

 
6

 
(14
)
 
(3
)
Loss on sale of assets
—

 
—

 
—

 
—

 
(83
)
 
—

 
(83
)
Impairment loss on investment
(137
)
 
—

 
—

 
—

 
(2
)
 
—

 
(139
)
Loss on debt extinguishment, net
—

 
—

 
—

 
—

 
(69
)
 
—

 
(69
)
(Loss)/income from continuing operations before income taxes
(433
)
 
808

 
(122
)
 
78

 
(495
)
 
(9
)
 
(173
)
(Loss)/income from continuing operations
(433
)
 
807

 
(111
)
 
66

 
(540
)
 
(9
)
 
(220
)
Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(9
)
 
—

 
(9
)
Net (Loss)/Income
(433
)
 
807

 
(111
)
 
66

 
(549
)
 
(9
)
 
(229
)
Net (Loss)/Income attributable to NRG Energy, Inc.
$
(433
)
 
$
807

 
$
(96
)
 
$
58

 
$
(558
)
 
$
33

 
$
(189
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
330

 
$
5

 
$
8

 
$
6

 
$
29

 
$
—

 
$
378