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Segment Reporting
 9 Months Ended
Sep. 30, 2012
Segment Reporting Disclosure [Abstract]  
Segment Reporting Disclosure
— Segment Reporting

Effective in fiscal year 2012, NRG's segment structure and its allocation of corporate expenses were updated to reflect how management currently makes financial decisions and allocates resources. The Company has recast the data from prior periods to reflect this change in reportable segments to conform to the current year presentation. The Company's businesses are primarily segregated based on the Retail businesses, conventional power generation, alternative energy businesses and corporate activities.  Within NRG's conventional power generation operations, there are distinct components with separate operating results and management structures for the following geographical regions: Texas, Northeast, South Central, West and Other, which includes its international businesses, thermal and chilled water business and maintenance services.  The Company's alternative energy businesses include solar and wind assets, electric vehicle services and the carbon capture business.  Intersegment sales are accounted for at market.

(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.