v3.19.2

Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | $ 2,599 | [1] | $ 2,259 | [1] | $ 5,198 | [2] | $ 4,268 | [2]
Commodity Margin | 752 |  | 694 |  | 1,531 |  | 1,306 |
Add: Mark-to-market commodity activity, net and other(2) | 200 | [3] | 196 | [3] | 252 | [4] | (177) | [4]
Operating and maintenance expense | 245 |  | 242 |  | 484 |  | 517 |
Depreciation and amortization expense | 175 |  | 186 |  | 349 |  | 387 |
General and other administrative expense | 34 |  | 31 |  | 66 |  | 91 |
Other operating expenses | 19 |  | 19 |  | 38 |  | 56 |
Impairment losses | 40 |  | 0 |  | 55 |  | 0 |
(Income) loss from unconsolidated investments in power plants | (5) |  | (5) |  | (11) |  | (11) |
Income from operations | 444 |  | 417 |  | 802 |  | 89 |
Interest expense | 157 |  | 157 |  | 306 |  | 308 |
Debt Extinguishment Costs and Other (Income) Expense, Net | 8 |  | 62 |  | 27 |  | 69 |
Income (loss) before income taxes | 279 |  | 198 |  | 469 |  | (288) |
Lease levelization | (19) |  | (19) |  | (35) |  | (35) |
West [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 649 | [1] | 355 | [1] | 1,331 | [2] | 835 | [2]
Commodity Margin | 251 |  | 241 |  | 515 |  | 426 |
Add: Mark-to-market commodity activity, net and other(2) | 58 | [3] | (23) | [3] | 114 | [4] | (10) | [4]
Operating and maintenance expense | 84 |  | 80 |  | 165 |  | 170 |
Depreciation and amortization expense | 60 |  | 67 |  | 133 |  | 134 |
General and other administrative expense | 5 |  | 5 |  | 12 |  | 21 |
Other operating expenses | 7 |  | 8 |  | 16 |  | 22 |
Impairment losses | 0 |  |  |  | 0 |  |  |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | 153 |  | 58 |  | 303 |  | 69 |
Texas [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 899 | [1] | 993 | [1] | 1,642 | [2] | 1,133 | [2]
Commodity Margin | 173 |  | 151 |  | 335 |  | 317 |
Add: Mark-to-market commodity activity, net and other(2) | 240 | [3] | 301 | [3] | 284 | [4] | (246) | [4]
Operating and maintenance expense | 66 |  | 65 |  | 131 |  | 145 |
Depreciation and amortization expense | 54 |  | 57 |  | 99 |  | 133 |
General and other administrative expense | 15 |  | 13 |  | 27 |  | 38 |
Other operating expenses | 1 |  | 3 |  | 3 |  | 19 |
Impairment losses | 0 |  |  |  | 0 |  |  |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | 277 |  | 314 |  | 359 |  | (264) |
East [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 646 | [1] | 341 | [1] | 1,335 | [2] | 955 | [2]
Commodity Margin | 235 |  | 225 |  | 500 |  | 409 |
Add: Mark-to-market commodity activity, net and other(2) | 94 | [3] | (7) | [3] | 107 | [4] | 33 | [4]
Operating and maintenance expense | 72 |  | 65 |  | 139 |  | 136 |
Depreciation and amortization expense | 48 |  | 49 |  | 91 |  | 94 |
General and other administrative expense | 10 |  | 8 |  | 19 |  | 23 |
Other operating expenses | 11 |  | 8 |  | 19 |  | 15 |
Impairment losses | 40 |  |  |  | 55 |  |  |
(Income) loss from unconsolidated investments in power plants | (6) |  | (6) |  | (12) |  | (12) |
Income from operations | 154 |  | 94 |  | 296 |  | 186 |
Retail [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 1,082 | [1] | 935 | [1] | 2,080 | [2] | 1,873 | [2]
Commodity Margin | 93 |  | 77 |  | 181 |  | 154 |
Add: Mark-to-market commodity activity, net and other(2) | (182) | [3] | (67) | [3] | (235) | [4] | 61 | [4]
Operating and maintenance expense | 33 |  | 41 |  | 67 |  | 81 |
Depreciation and amortization expense | 13 |  | 13 |  | 26 |  | 26 |
General and other administrative expense | 4 |  | 5 |  | 8 |  | 9 |
Other operating expenses | 0 |  | 0 |  | 0 |  | 0 |
Impairment losses | 0 |  |  |  | 0 |  |  |
(Income) loss from unconsolidated investments in power plants | 1 |  | 1 |  | 1 |  | 1 |
Income from operations | (140) |  | (50) |  | (156) |  | 98 |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | (677) | [1] | (365) | [1] | (1,190) | [2] | (528) | [2]
Commodity Margin | 0 |  | 0 |  | 0 |  | 0 |
Add: Mark-to-market commodity activity, net and other(2) | (10) | [3] | (8) | [3] | (18) | [4] | (15) | [4]
Operating and maintenance expense | (10) |  | (9) |  | (18) |  | (15) |
Depreciation and amortization expense | 0 |  | 0 |  | 0 |  | 0 |
General and other administrative expense | 0 |  | 0 |  | 0 |  | 0 |
Other operating expenses | 0 |  | 0 |  | 0 |  | 0 |
Impairment losses | 0 |  |  |  | 0 |  |  |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | 0 |  | 1 |  | 0 |  | 0 |
Intersegment Eliminations [Member] | West [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 100 |  | 70 |  | 262 |  | 184 |
Intersegment Eliminations [Member] | Texas [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 348 |  | 276 |  | 559 |  | 209 |
Intersegment Eliminations [Member] | East [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 228 |  | 18 |  | 365 |  | 133 |
Intersegment Eliminations [Member] | Retail [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Total operating revenues(1) | 1 |  | 1 |  | 4 |  | 2 |
Other Assets [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Amortization of Intangible Assets | $ 18 |  | $ 25 |  | $ 39 |  | $ 53 |
[1] | Includes intersegment revenues of $100 million and $70 million in the West, $348 million and $276 million in Texas, $228 million and $18 million in the East and $1 million and $1 million in Retail for the three months ended June 30, 2019 and 2018, respectively.
[2] | Includes intersegment revenues of $262 million and $184 million in the West, $559 million and $209 million in Texas, $365 million and $133 million in the East and $4 million and $2 million in Retail for the six months ended June 30, 2019 and 2018, respectively.
[3] | Includes $(19) million and $(19) million of lease levelization and $18 million and $25 million of amortization expense for the three months ended June 30, 2019 and 2018, respectively.
[4] | Includes $(35) million and $(35) million of lease levelization and $39 million and $53 million of amortization expense for the six months ended June 30, 2019 and 2018, respectively.

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