v3.19.1

Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2019
Segment Reporting [Abstract] |
Schedule of Financial Data for Segments | The tables below show 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):
| Three Months Ended March 31, 2019
| Wholesale |  |  |  | Consolidation |  |
| West |  | Texas |  | East |  | Retail |  | Elimination |  | Total
Total operating revenues(1) | $ | 682 |  |  | $ | 743 |  |  | $ | 689 |  |  | $ | 998 |  |  | $ | (513 | ) |  | $ | 2,599 |
Commodity Margin | $ | 264 |  |  | $ | 162 |  |  | $ | 265 |  |  | $ | 88 |  |  | $ | — |  |  | $ | 779 |
Add: Mark-to-market commodity activity, net and other(2) | 56 |  |  | 44 |  |  | 13 |  |  | (53 | ) |  | (8 | ) |  | 52 |
Less: |  |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance expense | 81 |  |  | 65 |  |  | 67 |  |  | 34 |  |  | (8 | ) |  | 239 |
Depreciation and amortization expense | 73 |  |  | 45 |  |  | 43 |  |  | 13 |  |  | — |  |  | 174 |
General and other administrative expense | 7 |  |  | 12 |  |  | 9 |  |  | 4 |  |  | — |  |  | 32 |
Other operating expenses | 9 |  |  | 2 |  |  | 23 |  |  | — |  |  | — |  |  | 34 |
(Income) from unconsolidated subsidiaries | — |  |  | — |  |  | (6 | ) |  | — |  |  | — |  |  | (6 | )
Income (loss) from operations | 150 |  |  | 82 |  |  | 142 |  |  | (16 | ) |  | — |  |  | 358 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 149 |
Gain on extinguishment of debt and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 19 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 190 |
| Three Months Ended March 31, 2018
| Wholesale |  |  |  | Consolidation |  |
| West |  | Texas |  | East |  | Retail |  | Elimination |  | Total
Total operating revenues(1) | $ | 480 |  |  | $ | 140 |  |  | $ | 614 |  |  | $ | 938 |  |  | $ | (163 | ) |  | $ | 2,009 |
Commodity Margin | $ | 185 |  |  | $ | 166 |  |  | $ | 184 |  |  | $ | 77 |  |  | $ | — |  |  | $ | 612 |
Add: Mark-to-market commodity activity, net and other(2) | 13 |  |  | (547 | ) |  | 40 |  |  | 128 |  |  | (7 | ) |  | (373 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Operating and maintenance expense | 90 |  |  | 80 |  |  | 71 |  |  | 40 |  |  | (6 | ) |  | 275 |
Depreciation and amortization expense | 67 |  |  | 76 |  |  | 45 |  |  | 13 |  |  | — |  |  | 201 |
General and other administrative expense | 16 |  |  | 25 |  |  | 15 |  |  | 4 |  |  | — |  |  | 60 |
Other operating expenses | 14 |  |  | 16 |  |  | 7 |  |  | — |  |  | — |  |  | 37 |
(Income) from unconsolidated subsidiaries | — |  |  | — |  |  | (6 | ) |  | — |  |  | — |  |  | (6 | )
Income (loss) from operations | 11 |  |  | (578 | ) |  | 92 |  |  | 148 |  |  | (1 | ) |  | (328 | )
Interest expense |  |  |  |  |  |  |  |  |  |  | 151 |
Other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 7 |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  | $ | (486 | )
_________
(1) | Includes intersegment revenues of $162 million and $114 million in the West, $211 million and $(67) million in Texas, $137 million and $115 million in the East and $3 million and $1 million in Retail for the three months ended March 31, 2019 and 2018, respectively.
(2) | Includes $(16) million and $(16) million of lease levelization and $21 million and $28 million of amortization expense for the three months ended March 31, 2019 and 2018, respectively.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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