v2.4.0.8

Segment and Significant Customer Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | $ 1,965 |  | $ 1,241 |
Intersegment revenue | 0 |  | 0 |
Operating revenues | 1,965 |  | 1,241 |
Commodity Margin | 645 |  | 461 |
Add: Mark-to-market commodity activity, net and other | (37) | [1] | (41) | [1]
Plant operating expense | 265 |  | 227 |
Depreciation and amortization expense | 153 |  | 146 |
Sales, general and other administrative expense | 33 |  | 33 |
Other operating expenses | 22 |  | 18 |
(Income) loss from unconsolidated investments in power plants | (9) |  | (8) |
Income from operations | 144 |  | 4 |
Interest expense, net of interest income | 165 |  | 174 |
Other (income) expense, net | 11 |  | 5 |
Loss before income taxes | (32) |  | (175) |
Lease levelization | (29) |  | (16) |
Contract amortization | 4 |  | 4 |
West [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | 491 |  | 383 |
Intersegment revenue | 2 |  | 1 |
Operating revenues | 493 |  | 384 |
Commodity Margin | 202 |  | 202 |
Add: Mark-to-market commodity activity, net and other | 29 | [1] | (37) | [1]
Plant operating expense | 105 |  | 95 |
Depreciation and amortization expense | 60 |  | 53 |
Sales, general and other administrative expense | 10 |  | 7 |
Other operating expenses | 12 |  | 9 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |
Income from operations | 44 |  | 1 |
Texas [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | 647 |  | 407 |
Intersegment revenue | 12 |  | 7 |
Operating revenues | 659 |  | 414 |
Commodity Margin | 121 |  | 76 |
Add: Mark-to-market commodity activity, net and other | (46) | [1] | (11) | [1]
Plant operating expense | 90 |  | 65 |
Depreciation and amortization expense | 42 |  | 42 |
Sales, general and other administrative expense | 12 |  | 14 |
Other operating expenses | 2 |  | 1 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |
Income from operations | (71) |  | (57) |
North [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | 639 |  | 306 |
Intersegment revenue | 15 |  | 7 |
Operating revenues | 654 |  | 313 |
Commodity Margin | 267 |  | 142 |
Add: Mark-to-market commodity activity, net and other | (17) | [1] | 7 | [1]
Plant operating expense | 52 |  | 43 |
Depreciation and amortization expense | 33 |  | 33 |
Sales, general and other administrative expense | 6 |  | 6 |
Other operating expenses | 6 |  | 7 |
(Income) loss from unconsolidated investments in power plants | (9) |  | (8) |
Income from operations | 162 |  | 68 |
Southeast [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | 188 |  | 145 |
Intersegment revenue | 81 |  | 33 |
Operating revenues | 269 |  | 178 |
Commodity Margin | 55 |  | 41 |
Add: Mark-to-market commodity activity, net and other | 6 | [1] | 7 | [1]
Plant operating expense | 27 |  | 31 |
Depreciation and amortization expense | 18 |  | 19 |
Sales, general and other administrative expense | 6 |  | 6 |
Other operating expenses | 1 |  | 1 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |
Income from operations | 9 |  | (9) |
Intersegment Elimination [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue from External Customer | 0 |  | 0 |
Intersegment revenue | (110) |  | (48) |
Operating revenues | (110) |  | (48) |
Commodity Margin | 0 |  | 0 |
Add: Mark-to-market commodity activity, net and other | (9) | [1] | (7) | [1]
Plant operating expense | (9) |  | (7) |
Depreciation and amortization expense | 0 |  | (1) |
Sales, general and other administrative expense | (1) |  | 0 |
Other operating expenses | 1 |  | 0 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |
Income from operations | $ 0 |  | $ 1 |
[1] | Includes $(29) million and $(16) million of lease levelization and $4 million and $4 million of amortization expense for the three months ended March 31, 2014 and 2013, respectively.

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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