v3.19.1

Segment and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment and Significant Customer Information [Abstract] |
Schedule of Financial Data for 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.

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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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