v3.2.0.727

Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 1,442 |  | $ 1,939 |  | $ 3,088 |  | $ 3,904 |
Commodity Margin |  | 657 |  | 632 | [1] | 1,192 |  | 1,277 | [1]
Add: Mark-to-market commodity activity, net and other |  | 19 | [1] | 173 | [2] | 120 | [3] | 136 | [3]
Plant operating expense |  | 272 |  | 274 |  | 532 |  | 539 |
Depreciation and amortization expense |  | 160 |  | 147 |  | 318 |  | 300 |
Sales, general and other administrative expense |  | 30 |  | 38 |  | 67 |  | 71 |
Other operating expenses |  | 20 |  | 21 |  | 40 |  | 43 |
(Income) loss from unconsolidated investments in power plants |  | (7) |  | (4) |  | (12) |  | (13) |
Income from operations |  | 201 |  | 329 |  | 367 |  | 473 |
Interest expense, net of interest income |  | 157 |  | 167 |  | 310 |  | 332 |
Debt extinguishment costs and other (income) expense, net |  | 18 |  | 6 |  | 39 |  | 17 |
Income before income taxes |  | 26 |  | 156 |  | 18 |  | 124 |
Lease levelization |  | (18) |  | (27) |  | (42) |  | (56) |
Contract amortization |  | 3 |  | 3 |  | 7 |  | 7 |
West [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 421 |  | 488 |  | 938 |  | 981 |
Commodity Margin |  | 240 |  | 228 | [1] | 458 |  | 430 | [1]
Add: Mark-to-market commodity activity, net and other |  | (14) | [1] | 21 | [2] | 105 | [3] | 50 | [3]
Plant operating expense |  | 120 |  | 95 |  | 226 |  | 200 |
Depreciation and amortization expense |  | 65 |  | 58 |  | 132 |  | 118 |
Sales, general and other administrative expense |  | 6 |  | 7 |  | 16 |  | 17 |
Other operating expenses |  | 10 |  | 15 |  | 20 |  | 27 |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 25 |  | 74 |  | 169 |  | 118 |
Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 575 |  | 963 |  | 1,159 |  | 1,622 |
Commodity Margin |  | 170 |  | 177 | [1] | 319 |  | 298 | [1]
Add: Mark-to-market commodity activity, net and other |  | 10 | [1] | 184 | [2] | 51 | [3] | 138 | [3]
Plant operating expense |  | 82 |  | 83 |  | 171 |  | 173 |
Depreciation and amortization expense |  | 50 |  | 48 |  | 99 |  | 90 |
Sales, general and other administrative expense |  | 15 |  | 18 |  | 32 |  | 30 |
Other operating expenses |  | 2 |  | 1 |  | 4 |  | 3 |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 31 |  | 211 |  | 64 |  | 140 |
East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 453 |  | 519 |  | 1,005 |  | 1,363 |
Commodity Margin |  | 247 |  | 227 | [1] | 415 |  | 549 | [1]
Add: Mark-to-market commodity activity, net and other |  | 30 | [1] | (24) | [2] | (22) | [3] | (35) | [3]
Plant operating expense |  | 77 |  | 103 |  | 149 |  | 182 |
Depreciation and amortization expense |  | 45 |  | 40 |  | 87 |  | 91 |
Sales, general and other administrative expense |  | 9 |  | 12 |  | 19 |  | 24 |
Other operating expenses |  | 8 |  | 9 |  | 16 |  | 16 |
(Income) loss from unconsolidated investments in power plants |  | (7) |  | (4) |  | (12) |  | (13) |
Income from operations |  | 145 |  | 43 |  | 134 |  | 214 |
Geography Consolidation and Elimination [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | (7) |  | (31) |  | (14) |  | (62) |
Commodity Margin |  | 0 |  | 0 | [1] | 0 |  | 0 | [1]
Add: Mark-to-market commodity activity, net and other |  | (7) | [1] | (8) | [2] | (14) | [3] | (17) | [3]
Plant operating expense |  | (7) |  | (7) |  | (14) |  | (16) |
Depreciation and amortization expense |  | 0 |  | 1 |  | 0 |  | 1 |
Sales, general and other administrative expense |  | 0 |  | 1 |  | 0 |  | 0 |
Other operating expenses |  | 0 |  | (4) |  | 0 |  | (3) |
(Income) loss from unconsolidated investments in power plants |  | 0 |  | 0 |  | 0 |  | 0 |
Income from operations |  | 0 |  | 1 |  | 0 |  | 1 |
Six Power Plants [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Commodity Margin | [2] |  |  | 42 |  |  |  | 81 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 1,442 |  | 1,939 |  | 3,088 |  | 3,904 |
Operating Segments [Member] | West [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 421 |  | 487 |  | 936 |  | 978 |
Operating Segments [Member] | Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 570 |  | 960 |  | 1,151 |  | 1,607 |
Operating Segments [Member] | East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 451 |  | 492 |  | 1,001 |  | 1,319 |
Operating Segments [Member] | Geography Consolidation and Elimination [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 |  | 0 |  | 1 |  | 2 |  | 3 |
Intersegment Eliminations [Member] | Texas [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 5 |  | 3 |  | 8 |  | 15 |
Intersegment Eliminations [Member] | East [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | 2 |  | 27 |  | 4 |  | 44 |
Intersegment Eliminations [Member] | Geography Consolidation and Elimination [Member] |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |
Operating revenues |  | $ (7) |  | $ (31) |  | $ (14) |  | $ (62) |
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 $42 million and $81 million for the three and six months ended June 30, 2014
[2] | Includes $(18) million and $(27) million of lease levelization and $3 million and $3 million of amortization expense for the three months ended June 30, 2015 and 2014, respectively.
[3] | Includes $(42) million and $(56) million of lease levelization and $7 million and $7 million of amortization expense for the six months ended June 30, 2015 and 2014, respectively.

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