v3.19.1

Segment and Significant Customer Information | 12 Months Ended
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Dec. 31, 2018
Segment and Significant Customer Information [Abstract] |
Segment and Significant Customer Information | Segment and Significant Customer Information We assess our business on a regional basis due to the effect on our financial performance of the differing characteristics of these regions, particularly with respect to competition, regulation and other factors affecting supply and demand. During the first quarter of 2018, we altered the composition of our segments to report the results associated with our retail business as a separate segment. This change reflects the manner in which our segment information is presented internally to our chief operating decision maker associated with the strategic utilization of our retail business subsequent to the consummation of the Merger. Thus, beginning in the first quarter of 2018, our geographic reportable segments for our wholesale business are West (including geothermal), Texas and East (including Canada) and we have a separate reportable segment for our retail business. The tables below have been updated to present our segments on this revised basis for all periods. We continue to evaluate the optimal manner in which we assess our performance including our segments and future changes may result in changes to the composition of our geographic segments. Commodity Margin is a key operational measure of profit reviewed by our chief operating decision maker to assess the performance of our segments. The tables below show our financial data for our segments (including a reconciliation of our Commodity Margin to income (loss) from operations by segment) for the periods indicated (in millions).
| Year Ended December 31, 2018
| Wholesale |  |  |  |  |  |
| West |  | Texas |  | East |  | Retail |  | Consolidation and Elimination |  | Total
Total operating revenues(1) | $ | 1,988 |  |  | $ | 2,860 |  |  | $ | 1,987 |  |  | $ | 3,976 |  |  | $ | (1,299 | ) |  | $ | 9,512 |
Commodity Margin | $ | 1,060 |  |  | $ | 646 |  |  | $ | 970 |  |  | $ | 357 |  |  | $ | — |  |  | $ | 3,033 |
Add: Mark-to-market commodity activity, net and other(2) | (165 | ) |  | (197 | ) |  | 40 |  |  | 84 |  |  | (32 | ) |  | (270 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance expense | 348 |  |  | 272 |  |  | 269 |  |  | 163 |  |  | (32 | ) |  | 1,020 |
Depreciation and amortization expense | 269 |  |  | 237 |  |  | 180 |  |  | 53 |  |  | — |  |  | 739 |
General and other administrative expense | 40 |  |  | 61 |  |  | 38 |  |  | 19 |  |  | — |  |  | 158 |
Other operating expenses | 42 |  |  | 24 |  |  | 32 |  |  | — |  |  | — |  |  | 98 |
Impairment losses | — |  |  | — |  |  | 10 |  |  | — |  |  | — |  |  | 10 |
(Income) from unconsolidated subsidiaries | — |  |  | — |  |  | (26 | ) |  | 2 |  |  | — |  |  | (24 | )
Income (loss) from operations | 196 |  |  | (145 | ) |  | 507 |  |  | 204 |  |  | — |  |  | 762 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 617 |
(Gain) loss on extinguishment of debt and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 53 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 92 |
| Year Ended December 31, 2017
| Wholesale |  |  |  |  |  |
| West |  | Texas |  | East |  | Retail |  | Consolidation and Elimination |  | Total
Total operating revenues(1) | $ | 1,881 |  |  | $ | 2,342 |  |  | $ | 1,658 |  |  | $ | 3,797 |  |  | $ | (926 | ) |  | $ | 8,752 |
Commodity Margin | $ | 970 |  |  | $ | 552 |  |  | $ | 790 |  |  | $ | 396 |  |  | $ | — |  |  | $ | 2,708 |
Add: Mark-to-market commodity activity, net and other(2) | (19 | ) |  | (174 | ) |  | (62 | ) |  | (10 | ) |  | (29 | ) |  | (294 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance expense | 361 |  |  | 308 |  |  | 302 |  |  | 138 |  |  | (29 | ) |  | 1,080 |
Depreciation and amortization expense | 240 |  |  | 208 |  |  | 201 |  |  | 75 |  |  | — |  |  | 724 |
General and other administrative expense | 45 |  |  | 66 |  |  | 27 |  |  | 17 |  |  | — |  |  | 155 |
Other operating expenses | 38 |  |  | 14 |  |  | 33 |  |  | — |  |  | — |  |  | 85 |
Impairment losses | 28 |  |  | 13 |  |  | — |  |  | — |  |  | — |  |  | 41 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (27 | ) |  | — |  |  | — |  |  | (27 | )
(Income) from unconsolidated subsidiaries | — |  |  | — |  |  | (24 | ) |  | 2 |  |  | — |  |  | (22 | )
Income (loss) from operations | 239 |  |  | (231 | ) |  | 216 |  |  | 154 |  |  | — |  |  | 378 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 621 |
Debt modification and extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 70 |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  | $ | (313 | )
| Year Ended December 31, 2016
| Wholesale |  |  |  |  |  |
| West |  | Texas |  | East |  | Retail |  | Consolidation and Elimination |  | Total
Total operating revenues(1) | $ | 1,545 |  |  | $ | 2,145 |  |  | $ | 1,657 |  |  | $ | 1,520 |  |  | $ | (151 | ) |  | $ | 6,716 |
Commodity Margin | $ | 984 |  |  | $ | 543 |  |  | $ | 905 |  |  | $ | 172 |  |  | $ | — |  |  | $ | 2,604 |
Add: Mark-to-market commodity activity, net and other(2) | (11 | ) |  | 12 |  |  | 15 |  |  | (62 | ) |  | (29 | ) |  | (75 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance expense | 355 |  |  | 298 |  |  | 312 |  |  | 41 |  |  | (29 | ) |  | 977 |
Depreciation and amortization expense | 224 |  |  | 205 |  |  | 214 |  |  | 19 |  |  | — |  |  | 662 |
General and other administrative expense | 38 |  |  | 56 |  |  | 40 |  |  | 6 |  |  | — |  |  | 140 |
Other operating expenses | 33 |  |  | 8 |  |  | 38 |  |  | — |  |  | — |  |  | 79 |
Impairment losses | 13 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (157 | ) |  | — |  |  | — |  |  | (157 | )
(Income) from unconsolidated subsidiaries | — |  |  | — |  |  | (24 | ) |  | — |  |  | — |  |  | (24 | )
Income (loss) from operations | 310 |  |  | (12 | ) |  | 497 |  |  | 44 |  |  | — |  |  | 839 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 631 |
Debt modification and extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 49 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 159 |
__________
(1) | Includes intersegment revenues of $488 million, $324 million and $20 million in the West, $573 million, $361 million and $81 million in Texas, $234 million, $237 million and $48 million in the East and $4 million, $4 million, $2 million in Retail for the years ended December 31, 2018, 2017 and 2016, respectively.
(2) | Includes nil, $(8) million and $(2) million of lease levelization and $104 million, $178 million and $122 million of amortization expense for the years ended December 31, 2018, 2017 and 2016, respectively.
Significant Customers For the year ended December 31, 2018, 2017 and 2016, we had no significant customer that individually accounted for more than 10% of our annual consolidated revenues.

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- Definition Segment and Significant Customer Information [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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