v3.4.0.3

Segment Information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
Segment Reporting [Abstract] |
Schedule of Financial Data for Segments | The tables below show our financial data for our segments for the periods indicated (in millions).
| Three Months Ended March 31, 2016
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 424 |  |  | $ | 532 |  |  | $ | 659 |  |  | $ | — |  |  | $ | 1,615 |
Intersegment revenues | 2 |  |  | 3 |  |  | 3 |  |  | (8 | ) |  | — |
Total operating revenues | $ | 426 |  |  | $ | 535 |  |  | $ | 662 |  |  | $ | (8 | ) |  | $ | 1,615 |
Commodity Margin | $ | 197 |  |  | $ | 153 |  |  | $ | 230 |  |  | $ | — |  |  | $ | 580 |
Add: Mark-to-market commodity activity, net and other(1) | 46 |  |  | (110 | ) |  | (21 | ) |  | (6 | ) |  | (91 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 91 |  |  | 86 |  |  | 84 |  |  | (6 | ) |  | 255 |
Depreciation and amortization expense | 69 |  |  | 53 |  |  | 58 |  |  | — |  |  | 180 |
Sales, general and other administrative expense | 10 |  |  | 16 |  |  | 12 |  |  | — |  |  | 38 |
Other operating expenses | 8 |  |  | 2 |  |  | 10 |  |  | — |  |  | 20 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (7 | ) |  | — |  |  | (7 | )
Income (loss) from operations | 65 |  |  | (114 | ) |  | 52 |  |  | — |  |  | 3 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 156 |
Other (income) expense, net |  |  |  |  |  |  |  |  | 6 |
Loss before income taxes |  |  |  |  |  |  |  |  | $ | (159 | )
| Three Months Ended March 31, 2015
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 515 |  |  | $ | 581 |  |  | $ | 550 |  |  | $ | — |  |  | $ | 1,646 |
Intersegment revenues | 2 |  |  | 3 |  |  | 2 |  |  | (7 | ) |  | — |
Total operating revenues | $ | 517 |  |  | $ | 584 |  |  | $ | 552 |  |  | $ | (7 | ) |  | $ | 1,646 |
Commodity Margin | $ | 218 |  |  | $ | 149 |  |  | $ | 168 |  |  | $ | — |  |  | $ | 535 |
Add: Mark-to-market commodity activity, net and other(1) | 119 |  |  | 41 |  |  | (52 | ) |  | (7 | ) |  | 101 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 106 |  |  | 89 |  |  | 72 |  |  | (7 | ) |  | 260 |
Depreciation and amortization expense | 67 |  |  | 49 |  |  | 42 |  |  | — |  |  | 158 |
Sales, general and other administrative expense | 10 |  |  | 17 |  |  | 10 |  |  | — |  |  | 37 |
Other operating expenses | 10 |  |  | 2 |  |  | 8 |  |  | — |  |  | 20 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (5 | ) |  | — |  |  | (5 | )
Income (loss) from operations | 144 |  |  | 33 |  |  | (11 | ) |  | — |  |  | 166 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 153 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 21 |
Loss before income taxes |  |  |  |  |  |  |  |  | $ | (8 | )
_________
(1) | Includes $(22) million and $(24) million of lease levelization and $27 million and $4 million of amortization expense for the three months ended March 31, 2016 and 2015, respectively.

X
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
Name: | us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration