v2.4.0.6

Segment and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 31, 2012
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, 2012
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,668 |  |  | $ | 1,857 |  |  | $ | 1,280 |  |  | $ | 673 |  |  | $ | — |  |  | $ | 5,478 |
Intersegment revenues | 10 |  |  | 61 |  |  | 14 |  |  | 80 |  |  | (165 | ) |  | — |
Total operating revenues | $ | 1,678 |  |  | $ | 1,918 |  |  | $ | 1,294 |  |  | $ | 753 |  |  | $ | (165 | ) |  | $ | 5,478 |
Commodity Margin (1)(2) | $ | 994 |  |  | $ | 570 |  |  | $ | 729 |  |  | $ | 245 |  |  | $ | — |  |  | $ | 2,538 |
Add: Unrealized mark-to-market commodity activity, net and other(3) | (93 | ) |  | 87 |  |  | (14 | ) |  | (33 | ) |  | (31 | ) |  | (84 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 368 |  |  | 247 |  |  | 206 |  |  | 131 |  |  | (30 | ) |  | 922 |
Depreciation and amortization expense | 203 |  |  | 142 |  |  | 134 |  |  | 85 |  |  | (2 | ) |  | 562 |
Sales, general and other administrative expense | 36 |  |  | 47 |  |  | 28 |  |  | 29 |  |  | — |  |  | 140 |
Other operating expenses | 42 |  |  | 5 |  |  | 29 |  |  | 5 |  |  | (3 | ) |  | 78 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (7 | ) |  | (215 | ) |  | — |  |  | (222 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (28 | ) |  | — |  |  | — |  |  | (28 | )
Income from operations | 252 |  |  | 216 |  |  | 353 |  |  | 177 |  |  | 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 |
Income before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | 218 |
| Year Ended December 31, 2011
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,372 |  |  | $ | 2,306 |  |  | $ | 1,336 |  |  | $ | 786 |  |  | $ | — |  |  | $ | 6,800 |
Intersegment revenues | 12 |  |  | 23 |  |  | 7 |  |  | 135 |  |  | (177 | ) |  | — |
Total operating revenues | $ | 2,384 |  |  | $ | 2,329 |  |  | $ | 1,343 |  |  | $ | 921 |  |  | $ | (177 | ) |  | $ | 6,800 |
Commodity Margin(1)(2) | $ | 1,061 |  |  | $ | 469 |  |  | $ | 704 |  |  | $ | 240 |  |  | $ | — |  |  | $ | 2,474 |
Add: Unrealized mark-to-market commodity activity, net and other(3) | 113 |  |  | (102 | ) |  | (13 | ) |  | 1 |  |  | (32 | ) |  | (33 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 380 |  |  | 235 |  |  | 177 |  |  | 141 |  |  | (29 | ) |  | 904 |
Depreciation and amortization expense | 192 |  |  | 135 |  |  | 138 |  |  | 90 |  |  | (5 | ) |  | 550 |
Sales, general and other administrative expense | 43 |  |  | 43 |  |  | 24 |  |  | 22 |  |  | (1 | ) |  | 131 |
Other operating expenses | 41 |  |  | 3 |  |  | 30 |  |  | 5 |  |  | (2 | ) |  | 77 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (21 | ) |  | — |  |  | — |  |  | (21 | )
Income (loss) from operations | 518 |  |  | (49 | ) |  | 343 |  |  | (17 | ) |  | 5 |  |  | 800 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 751 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 145 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 115 |
Loss before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | (211 | )
| Year Ended December 31, 2010
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,525 |  |  | $ | 2,162 |  |  | $ | 978 |  |  | $ | 880 |  |  | $ | — |  |  | $ | 6,545 |
Intersegment revenues | 12 |  |  | 22 |  |  | 6 |  |  | 138 |  |  | (178 | ) |  | — |
Total operating revenues | $ | 2,537 |  |  | $ | 2,184 |  |  | $ | 984 |  |  | $ | 1,018 |  |  | $ | (178 | ) |  | $ | 6,545 |
Commodity Margin(1)(2) | $ | 1,080 |  |  | $ | 504 |  |  | $ | 535 |  |  | $ | 272 |  |  | $ | — |  |  | $ | 2,391 |
Add: Unrealized mark-to-market commodity activity, net and other | 69 |  |  | 89 |  |  | 21 |  |  | 22 |  |  | (30 | ) |  | 171 |
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 351 |  |  | 285 |  |  | 138 |  |  | 123 |  |  | (29 | ) |  | 868 |
Depreciation and amortization expense | 207 |  |  | 150 |  |  | 111 |  |  | 109 |  |  | (7 | ) |  | 570 |
Sales, general and other administrative expense | 55 |  |  | 38 |  |  | 45 |  |  | 12 |  |  | 1 |  |  | 151 |
Other operating expenses | 59 |  |  | 2 |  |  | 28 |  |  | 4 |  |  | (2 | ) |  | 91 |
Impairment losses | 97 |  |  | — |  |  | — |  |  | 19 |  |  | — |  |  | 116 |
(Gain) on sale of assets, net | — |  |  | (119 | ) |  | — |  |  | — |  |  | — |  |  | (119 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (16 | ) |  | — |  |  | — |  |  | (16 | )
Income from operations | 380 |  |  | 237 |  |  | 250 |  |  | 27 |  |  | 7 |  |  | 901 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 802 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 223 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 106 |
Loss before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | (230 | )
__________
(1) | Our North segment includes Commodity Margin related to Riverside Energy Center, LLC of $73 million , $70 million and $73 million for the years ended December 31, 2012, 2011 and 2010, respectively.
(2) | Our Southeast segment includes Commodity Margin related to Broad River of $52 million, $51 million and $55 million for the years ended December 31, 2012, 2011 and 2010, respectively.
(3) | Includes $1 million and $12 million of lease levelization and $14 million and $8 million of amortization expense for the years ended December 31, 2012 and 2011, respectively, related to contracts that became effective in 2011.

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- 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 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 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=6534315&loc=d3e8813-108599 Reference 3: 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=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6534315&loc=d3e8906-108599 Reference 6: 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=6534315&loc=d3e8721-108599 + Details
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