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Segment Reporting (Tables)
 9 Months Ended
Sep. 30, 2012
Segment Reporting Information [Line Items]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
(In millions)
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
Three months ended September 30, 2012
Retail(a)
 
Texas(a)
 
North- east(a)
 
South
Central
 
West
 
Other(a)
 
Alternative Energy(a)
 
Corporate(a)(b)
 
Elimination
 
Total
Operating revenues
$
1,856

 
$
877

 
$
274

 
$
270

 
$
87

 
$
68

 
$
56

 
$
4

 
$
(1,161
)
 
$
2,331

Depreciation and amortization
41

 
115

 
32

 
23

 
3

 
4

 
18

 
3

 
—

 
239

Equity in earnings/(loss) of unconsolidated affiliates
—

 
—

 
3

 
—

 
4

 
2

 
(5
)
 
—

 
—

 
4

(Loss)/income before income taxes
(300
)
 
299

 
33

 
19

 
35

 
9

 
—

 
(200
)
 
—

 
(105
)
Net (loss)/income attributable to NRG Energy, Inc.
$
(300
)
 
$
299

 
$
33

 
$
19

 
$
35

 
$
9

 
$
(9
)
 
$
(87
)
 
$
—

 
$
(1
)
Total assets
$
3,179

 
$
12,109

 
$
1,945

 
$
1,676

 
$
909

 
$
692

 
$
5,615

 
$
18,076

 
$
(16,981
)
 
$
27,220


(a) Includes intersegment sales and derivative gains and losses of:
$
3

 
$
1,126

 
$
6

 
$
—

 
$
—

 
$
12

 
$
10

 
$
4


(b) Includes loss on debt extinguishment of $41 million.

(In millions)
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
Three months ended September 30, 2011
Retail(c)
 
Texas(c)(d)
 
North-east(c)
 
South
Central
 
West
 
Other(c)
 
Alternative Energy(c)
 
Corporate(c)(e)
 
Elimination
 
Total
Operating revenues
$
1,861

 
$
817

 
$
298

 
$
279

 
$
45

 
$
81

 
$
10

 
$
5

 
$
(722
)
 
$
2,674

Depreciation and amortization
48

 
117

 
33

 
23

 
2

 
4

 
7

 
4

 
—

 
238

Equity in earnings/(loss) of unconsolidated affiliates
—

 
—

 
4

 
—

 
4

 
3

 
6

 
(1
)
 
—

 
16

Income/(loss) before income taxes
36

 
(45
)
 
6

 
21

 
27

 
7

 
(12
)
 
(175
)
 
—

 
(135
)
Net income/(loss) attributable to
NRG Energy, Inc.
$
36

 
$
(45
)
 
$
6

 
$
21

 
$
27

 
$
5

 
$
(12
)
 
$
(93
)
 
$
—

 
$
(55
)

(c) Includes intersegment sales and derivative gains and losses of:
$
4

 
$
697

 
$
3

 
$
—

 
$
—

 
$
6

 
$
5

 
$
5



(d) Includes impairment charge on emission allowances of $160 million.
(e) Includes loss on debt extinguishment of $32 million.


(In millions)
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
Nine months ended September 30, 2012
Retail(f)
 
Texas(f)
 
North-east(f)
 
South
Central
 
West
 
Other(f)
 
Alternative Energy(f)
 
Corporate(f)(g)
 
Elimination
 
Total
Operating revenues
$
4,492

 
$
1,462

 
$
598

 
$
653

 
$
185

 
$
262

 
$
114

 
$
11

 
$
(1,418
)
 
$
6,359

Depreciation and amortization
126

 
343

 
96

 
69

 
8

 
12

 
41

 
8

 
—

 
703

Equity in earnings of unconsolidated affiliates
—

 
—

 
11

 
—

 
6

 
8

 
1

 
—

 
—

 
26

Income/(loss) before income taxes
504

 
(202
)
 
(20
)
 
—

 
42

 
29

 
(22
)
 
(516
)
 
—

 
(185
)
Net income/(loss) attributable to NRG Energy, Inc.
$
504

 
$
(202
)
 
$
(20
)
 
$
—

 
$
42

 
$
25

 
$
(40
)
 
$
(266
)
 
$
—

 
$
43

(f) Includes intersegment sales and derivative gains and losses of:
$
3

 
$
1,287

 
$
51

 
$
—

 
$
—

 
$
55

 
$
18

 
$
4


(g) Includes loss on debt extinguishment of $41 million.

(In millions)
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
Nine months ended September 30, 2011
Retail(h)
 
Texas(h)(i)
 
North-east(h)
 
South
Central
 
West
 
Other(h)
 
Alternative Energy(h)
 
Corporate(h)(j)
 
Elimination
 
Total
Operating revenues
$
4,409

 
$
2,149

 
$
770

 
$
656

 
$
122

 
$
244

 
$
33

 
$
9

 
$
(1,445
)
 
$
6,947

Depreciation and amortization
114

 
347

 
89

 
65

 
7

 
11

 
22

 
10

 
—

 
665

Equity in earnings/(losses) of unconsolidated affiliates
—

 
—

 
9

 
—

 
9

 
9

 
—

 
(1
)
 
—

 
26

Income/(loss) before income taxes
347

 
193

 
(13
)
 
46

 
51

 
20

 
(42
)
 
(1,111
)
 
—

 
(509
)
Net income/(loss)attributable to NRG Energy, Inc.
$
350

 
$
193

 
$
(13
)
 
$
46

 
$
51

 
$
14

 
$
(42
)
 
$
(293
)
 
$
—

 
$
306

(h) Includes intersegment sales and derivative gains and losses of:
$
4

 
$
1,401

 
$
5

 
$
—

 
$
—

 
$
15

 
$
13

 
$
5


(i) Includes impairment charge on emission allowances of $160 million.
(j) Includes impairment charge on investment of $495 million, loss on debt extinguishment of $175 million, and tax benefit of $633 million resulting from the resolution of the federal tax audit.