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Segment and Significant Customer Information (Tables)
 12 Months Ended
Dec. 31, 2014
Segment and Significant Customer Information [Abstract]  
Schedule of Financial Data for Segments
The tables below show our financial data for our segments for the periods indicated (in millions).
 
Year Ended December 31, 2014
 
West
 
Texas
 
East
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
2,352

 
$
3,229

 
$
2,449

 
$
—

 
$
8,030

Intersegment revenues
6

 
23

 
47

 
(76
)
 
—

Total operating revenues
$
2,358

 
$
3,252

 
$
2,496

 
$
(76
)
 
$
8,030

Commodity Margin(1)
$
1,050

 
$
760

 
$
949

 
$
—

 
$
2,759

Add: Mark-to-market commodity activity, net and other(2)
220

 
142

 
48

 
(31
)
 
379

Less:
 
 
 
 
 
 
 
 
 
Plant operating expense
385

 
313

 
302

 
(31
)
 
969

Depreciation and amortization expense
245

 
191

 
168

 
(1
)
 
603

Sales, general and other administrative expense
41

 
64

 
39

 
—

 
144

Other operating expenses
50

 
5

 
32

 
1

 
88

Impairment loss
—

 
—

 
123

 
—

 
123

(Gain) on sale of assets, net
—

 
—

 
(753
)
 
—

 
(753
)
(Income) from unconsolidated investments in power plants
—

 
—

 
(25
)
 
—

 
(25
)
Income from operations
549

 
329

 
1,111

 
—

 
1,989

Interest expense, net of interest income
 
 
 
 
 
 
 
 
639

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
367

Income before income taxes
 
 
 
 
 
 
 
 
$
983


 
Year Ended December 31, 2013
 
West
 
Texas
 
East
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
1,937

 
$
2,347

 
$
2,017

 
$
—

 
$
6,301

Intersegment revenues
5

 
(4
)
 
117

 
(118
)
 
—

Total operating revenues
$
1,942

 
$
2,343

 
$
2,134

 
$
(118
)
 
$
6,301

Commodity Margin(1)
$
1,020

 
$
632

 
$
916

 
$
—

 
$
2,568

Add: Mark-to-market commodity activity, net and other(2)
(50
)
 
51

 
27

 
(31
)
 
(3
)
Less:
 
 
 
 
 
 
 
 
 
Plant operating expense
365

 
269

 
292

 
(31
)
 
895

Depreciation and amortization expense
227

 
165

 
203

 
(2
)
 
593

Sales, general and other administrative expense
37

 
56

 
42

 
1

 
136

Other operating expenses
45

 
3

 
33

 
—

 
81

Impairment loss
16

 
—

 
—

 
—

 
16

(Income) from unconsolidated investments in power plants
—

 
—

 
(30
)
 
—

 
(30
)
Income from operations
280

 
190

 
403

 
1

 
874

Interest expense, net of interest income
 
 
 
 
 
 
 
 
690

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
164

Income before income taxes
 
 
 
 
 
 
 
 
$
20


 
Year Ended December 31, 2012
 
West
 
Texas
 
East
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
1,668

 
$
1,857

 
$
1,953

 
$
—

 
$
5,478

Intersegment revenues
10

 
61

 
38

 
(109
)
 
—

Total operating revenues
$
1,678

 
$
1,918

 
$
1,991

 
$
(109
)
 
$
5,478

Commodity Margin(1)(3)(4)
$
994

 
$
570

 
$
974

 
$
—

 
$
2,538

Add: Mark-to-market commodity activity, net and other(2)
(93
)
 
87

 
(47
)
 
(31
)
 
(84
)
Less:
 
 
 
 
 
 
 
 
 
Plant operating expense
368

 
247

 
337

 
(30
)
 
922

Depreciation and amortization expense
203

 
142

 
219

 
(2
)
 
562

Sales, general and other administrative expense
36

 
47

 
57

 
—

 
140

Other operating expenses
42

 
5

 
34

 
(3
)
 
78

(Gain) on sale of assets, net
—

 
—

 
(222
)
 
—

 
(222
)
(Income) from unconsolidated investments in power plants
—

 
—

 
(28
)
 
—

 
(28
)
Income from operations
252

 
216

 
530

 
4

 
1,002

Interest expense, net of interest income
 
 
 
 
 
 
 
 
725

Loss on interest rate derivatives
 
 
 
 
 
 
 
 
14

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
45

Loss before income taxes
 
 
 
 
 
 
 
 
$
218

__________
(1)
Our East segment includes Commodity Margin of $81 million, $152 million and $131 million for the years ended December 31, 2014, 2013 and 2012, respectively, related to the six power plants in our East segment that were sold in July 2014.
(2)
Includes $(5) million, $6 million and $1 million of lease levelization and $14 million, $14 million and $14 million of amortization expense for the years ended December 31, 2014, 2013 and 2012, respectively.
(3)
Our East segment includes Commodity Margin of $52 million for the year ended December 31, 2012, related to Broad River, which was sold in December 2012.
(4)
Our East segment includes Commodity Margin of $73 million for the year ended December 31, 2012, related to Riverside Energy Center, LLC, which was sold in December 2012.