v3.3.0.814

Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 1,948 |  | $ 2,187 |  | $ 5,036 |  | $ 6,091 |
Commodity Margin |  | 974 |  | 944 | [1] | 2,166 |  | 2,221 | [1]
Add: Mark-to-market commodity activity, net and other |  | (99) | [1] | (25) | [2] | 21 | [3] | 111 | [3]
Plant operating expense |  | 200 |  | 215 |  | 732 |  | 754 |
Depreciation and amortization expense |  | 166 |  | 153 |  | 484 |  | 453 |
Sales, general and other administrative expense |  | 33 |  | 37 |  | 100 |  | 108 |
Other operating expenses |  | 16 |  | 23 |  | 56 |  | 66 |
Impairment losses |  | 0 |  | 123 |  | 0 |  | 123 |
(Gain) on sale of assets, net |  | 0 |  | (753) |  | 0 |  | (753) |
(Income) loss from unconsolidated investments in power plants |  | (6) |  | (5) |  | (18) |  | (18) |
Income from operations |  | 466 |  | 1,126 |  | 833 |  | 1,599 |
Interest expense, net of interest income |  | 158 |  | 154 |  | 468 |  | 486 |
Debt extinguishment costs and other (income) expense, net |  | 1 |  | 344 |  | 40 |  | 361 |
Income before income taxes |  | 307 |  | 628 |  | 325 |  | 752 |
Lease levelization |  | 41 |  | 49 |  | (1) |  | (7) |
Amortization of Intangible Assets |  | 4 |  | 4 |  | 11 |  | 11 |
West [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 737 |  | 715 |  | 1,675 |  | 1,696 |
Commodity Margin |  | 385 |  | 361 | [1] | 843 |  | 791 | [1]
Add: Mark-to-market commodity activity, net and other |  | 68 | [1] | 41 | [2] | 173 | [3] | 91 | [3]
Plant operating expense |  | 87 |  | 91 |  | 313 |  | 291 |
Depreciation and amortization expense |  | 61 |  | 65 |  | 193 |  | 183 |
Sales, general and other administrative expense |  | 7 |  | 11 |  | 23 |  | 28 |
Other operating expenses |  | 8 |  | 12 |  | 28 |  | 39 |
Impairment losses |  |  |  | 0 |  |  |  | 0 |
(Gain) on sale of assets, net |  |  |  | 0 |  |  |  | 0 |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 290 |  | 223 |  | 459 |  | 341 |
Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 713 |  | 989 |  | 1,872 |  | 2,611 |
Commodity Margin |  | 264 |  | 346 | [1] | 583 |  | 644 | [1]
Add: Mark-to-market commodity activity, net and other |  | (98) | [1] | (64) | [2] | (47) | [3] | 74 | [3]
Plant operating expense |  | 62 |  | 77 |  | 233 |  | 250 |
Depreciation and amortization expense |  | 58 |  | 51 |  | 157 |  | 141 |
Sales, general and other administrative expense |  | 15 |  | 18 |  | 47 |  | 48 |
Other operating expenses |  | 2 |  | 1 |  | 6 |  | 4 |
Impairment losses |  |  |  | 0 |  |  |  | 0 |
(Gain) on sale of assets, net |  |  |  | 0 |  |  |  | 0 |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 29 |  | 135 |  | 93 |  | 275 |
East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 506 |  | 490 |  | 1,511 |  | 1,853 |
Commodity Margin |  | 325 |  | 237 | [1] | 740 |  | 786 | [1]
Add: Mark-to-market commodity activity, net and other |  | (62) | [1] | 4 | [2] | (84) | [3] | (31) | [3]
Plant operating expense |  | 57 |  | 55 |  | 206 |  | 237 |
Depreciation and amortization expense |  | 48 |  | 38 |  | 135 |  | 129 |
Sales, general and other administrative expense |  | 10 |  | 8 |  | 29 |  | 32 |
Other operating expenses |  | 8 |  | 6 |  | 24 |  | 22 |
Impairment losses |  |  |  | 123 |  |  |  | 123 |
(Gain) on sale of assets, net |  |  |  | (753) |  |  |  | (753) |
(Income) loss from unconsolidated investments in power plants |  | (6) |  | (5) |  | (18) |  | (18) |
Income from operations |  | 146 |  | 769 |  | 280 |  | 983 |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | (8) |  | (7) |  | (22) |  | (69) |
Commodity Margin |  | 0 |  | 0 | [1] | 0 |  | 0 | [1]
Add: Mark-to-market commodity activity, net and other |  | (7) | [1] | (6) | [2] | (21) | [3] | (23) | [3]
Plant operating expense |  | (6) |  | (8) |  | (20) |  | (24) |
Depreciation and amortization expense |  | (1) |  | (1) |  | (1) |  | 0 |
Sales, general and other administrative expense |  | 1 |  | 0 |  | 1 |  | 0 |
Other operating expenses |  | (2) |  | 4 |  | (2) |  | 1 |
Impairment losses |  |  |  | 0 |  |  |  | 0 |
(Gain) on sale of assets, net |  |  |  | 0 |  |  |  | 0 |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 1 |  | (1) |  | 1 |  | 0 |
Six Power Plants [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Commodity Margin | [2] |  |  |  |  |  |  | 81 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 1,948 |  | 2,187 |  | 5,036 |  | 6,091 |
Operating Segments [Member] | West [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 736 |  | 714 |  | 1,672 |  | 1,692 |
Operating Segments [Member] | Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 709 |  | 985 |  | 1,860 |  | 2,592 |
Operating Segments [Member] | East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 503 |  | 488 |  | 1,504 |  | 1,807 |
Operating Segments [Member] | Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 0 |  | 0 |  | 0 |  | 0 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 0 |  | 0 |  | 0 |  | 0 |
Intersegment Eliminations [Member] | West [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 1 |  | 1 |  | 3 |  | 4 |
Intersegment Eliminations [Member] | Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 4 |  | 4 |  | 12 |  | 19 |
Intersegment Eliminations [Member] | East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 3 |  | 2 |  | 7 |  | 46 |
Intersegment Eliminations [Member] | Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | $ (8) |  | $ (7) |  | $ (22) |  | $ (69) |
Six Power Plants [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of power plants disposed |  |  |  |  |  |  |  | 6 |
[1] | Commodity Margin related to the six power plants sold in our East segment on July 3, 2014, was not significant for the three months ended September 30, 2014. The Commodity Margin related to those power plants was $81 million for the nine months ended September 30, 2014
[2] | Includes $41 million and $49 million of lease levelization and $4 million and $4 million of amortization expense for the three months ended September 30, 2015 and 2014
[3] | Includes $(1) million and $(7) million of lease levelization and $11 million and $11 million of amortization expense for the nine months ended September 30, 2015 and 2014, respectively.

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