v2.3.0.15

Segment Information (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Segment Information [Line Items] |  |  |  |
Revenues from external customers | $ 2,209 | $ 2,130 | $ 5,341 | $ 5,074
Intersegment revenues |  |  |  |
Total operating revenues | 2,209 | 2,130 | 5,341 | 5,074
Commodity Margin | 825 | 852 | 1,921 | 1,815
Mark-to-Market Commodity Activity, Net and Other Revenue | (20) | 134 | (57) | 237
Plant operating expense | 212 | 199 | 711 | 630
Depreciation and amortization expense | 143 | 152 | 405 | 423
Sales, general and other administrative expense | 33 | 41 | 99 | 113
Other operating expense | 22 | 23 | 64 | 75
Impairment losses |  | 19 |  | 19
(Income) from unconsolidated investments in power plants | 5 | 1 | 12 | 14
Income from operations | 403 | 554 | 604 | 812
Interest expense, net of interest income | 190 | 228 | 568 | 627
(Gain) loss on interest rate derivatives, net | 3 | 84 | 149 | 87
Debt Extinguishment Costs and Other (Income) Expense, Net |  | 23 | 108 | 36
Loss before income taxes and discontinued operations | 210 | 219 | (221) | 62
Lease levelization | 11 |  | 15 |
Contract amortization | 4 |  | 5 |
RGGI Compliance and Other Environmental Costs | 3 | 1 | 7 | 6
West |  |  |  |
Segment Information [Line Items] |  |  |  |
Revenues from external customers | 688 | 716 | 1,753 | 1,906
Intersegment revenues | 3 | 2 | 7 | 7
Total operating revenues | 691 | 718 | 1,760 | 1,913
Commodity Margin | 329 | 338 | 798 | 809
Mark-to-Market Commodity Activity, Net and Other Revenue | 20 | 42 | 36 | 60
Plant operating expense | 94 | 86 | 297 | 264
Depreciation and amortization expense | 52 | 52 | 140 | 155
Sales, general and other administrative expense | 10 | 10 | 29 | 36
Other operating expense | 11 | 14 | 30 | 43
(Income) from unconsolidated investments in power plants |  |  |  |
Income from operations | 182 | 218 | 338 | 371
Texas |  |  |  |
Segment Information [Line Items] |  |  |  |
Revenues from external customers | 843 | 670 | 1,939 | 1,749
Intersegment revenues | 3 | 6 | 13 | 16
Total operating revenues | 846 | 676 | 1,952 | 1,765
Commodity Margin | 162 | 165 | 357 | 400
Mark-to-Market Commodity Activity, Net and Other Revenue | (21) | 62 | (54) | 148
Plant operating expense | 50 | 55 | 193 | 217
Depreciation and amortization expense | 34 | 37 | 99 | 113
Sales, general and other administrative expense | 10 | 13 | 33 | 29
Other operating expense | (1) |  | 2 | 2
(Income) from unconsolidated investments in power plants |  |  |  |
Income from operations | 48 | 122 | (24) | 187
North |  |  |  |
Segment Information [Line Items] |  |  |  |
Revenues from external customers | 430 | 468 | 1,025 | 725
Intersegment revenues | (8) | 2 | 5 | 4
Total operating revenues | 422 | 470 | 1,030 | 729
Commodity Margin | 259 | 259 | 578 | 390
Mark-to-Market Commodity Activity, Net and Other Revenue | (11) | 18 | (12) | 18
Plant operating expense | 44 | 38 | 136 | 83
Depreciation and amortization expense | 36 | 37 | 102 | 76
Sales, general and other administrative expense | 7 | 12 | 19 | 37
Other operating expense | 7 | 6 | 23 | 21
(Income) from unconsolidated investments in power plants | (5) | (1) | (12) | (14)
Income from operations | 159 | 185 | 298 | 205
Southeast |  |  |  |
Segment Information [Line Items] |  |  |  |
Revenues from external customers | 248 | 276 | 624 | 694
Intersegment revenues | 31 | 53 | 116 | 97
Total operating revenues | 279 | 329 | 740 | 791
Commodity Margin | 75 | 90 | 188 | 216
Mark-to-Market Commodity Activity, Net and Other Revenue |  | 18 | (4) | 31
Plant operating expense | 33 | 28 | 107 | 87
Depreciation and amortization expense | 22 | 28 | 67 | 84
Sales, general and other administrative expense | 7 | 5 | 18 | 11
Other operating expense |  |  | 3 | 2
Impairment losses |  | 19 |  | 19
(Income) from unconsolidated investments in power plants |  |  |  |
Income from operations | 13 | 28 | (11) | 44
Consolidation and Elimination |  |  |  |
Segment Information [Line Items] |  |  |  |
Revenues from external customers |  |  |  |
Intersegment revenues | (29) | (63) | (141) | (124)
Total operating revenues | (29) | (63) | (141) | (124)
Commodity Margin |  |  |  |
Mark-to-Market Commodity Activity, Net and Other Revenue | (8) | (6) | (23) | (20)
Plant operating expense | (9) | (8) | (22) | (21)
Depreciation and amortization expense | (1) | (2) | (3) | (5)
Sales, general and other administrative expense | (1) | 1 |  |
Other operating expense | 2 | 2 | (1) | 1
(Income) from unconsolidated investments in power plants |  |  |  |
Income from operations | $ 1 | $ 1 | $ 3 | $ 5

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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 4: 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 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e25351-111560 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-2/124-2 -Paragraph 22 -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. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 10 + 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 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: 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=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 9 Reference 8: 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=6880815&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 + Details
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