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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2018
 
 
(In millions)
Operating revenues(a)
$
1,481

 
$
327

 
$
86

 
$
225

 
$
2

 
$
300

 
$
2,421

Depreciation and amortization
28

 
67

 
51

 
81

 
8

 
—

 
235

Reorganization costs
3

 
4

 
—

 
—

 
13

 
—

 
20

Equity in earnings/(losses) of unconsolidated affiliates
—

 
2

 
—

 
4

 
(1
)
 
(7
)
 
(2
)
Income/(loss) from continuing operations before income taxes
946

 
(536
)
 
(40
)
 
(1
)
 
(126
)
 
(11
)
 
232

Income/(loss) from continuing operations
946

 
(536
)
 
(34
)
 
—

 
(132
)
 
(11
)
 
233

Net Income/(Loss)
946

 
(536
)
 
(34
)
 
—

 
(132
)
 
(11
)
 
233

Net Income/(Loss) attributable to NRG Energy, Inc.
$
940

 
$
(536
)
 
$
1

 
$
21

—

$
(148
)
 
$
1

 
$
279

Total assets as of March 31, 2018
$
3,521

 
$
7,313

 
$
5,191

 
$
8,362

 
$
9,108

 
$
(9,743
)
 
$
23,752

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

 
$
(307
)
 
$
8

 
$
—

 
$
(2
)
 
$
—

 
$
(300
)
 
Retail(a)
 
Generation(a)
 
Renewables(a)
 
NRG Yield
 
Corporate(a)(b)
 
Eliminations
 
Total
Three months ended March 31, 2017
 
 
(In millions)
Operating revenues(a)
$
1,335

 
$
965

 
$
95

 
$
221

 
$
10

 
$
(244
)
 
$
2,382

Depreciation and amortization
28

 
97

 
47

 
77

 
8

 
—

 
257

Equity in (losses)/earnings of unconsolidated affiliates
—

 
(13
)
 
—

 
19

 
3

 
(4
)
 
5

(Loss)/income from continuing operations before income taxes
(31
)
 
37

 
(35
)
 
(3
)
 
(137
)
 
(4
)
 
(173
)
(Loss)/income from continuing operations
(34
)
 
37

 
(29
)
 
(2
)
 
(137
)
 
(4
)
 
(169
)
Loss from discontinued operations, net of tax
—

 
—

 
—

 
—

 
(34
)
 
—

 
(34
)
Net (Loss)/Income
(34
)
 
37

 
(29
)
 
(2
)
 
(171
)
 
(4
)
 
(203
)
Net (Loss)/Income attributable to NRG Energy, Inc.
$
(33
)
 
$
37

 
$
(1
)
 
$
12

 
$
(171
)
 
$
(7
)
 
$
(163
)
(a) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
1

 
$
209

 
$
8

 
$
—

 
$
26

 
$
—

 
$
244

(b) Includes other income - affiliate
$
—

 
$
—

 
$
—

 
$
—

 
$
48

 
$
—

 
$
48