v3.3.1.900

Segment and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment and Significant Customer Information [Abstract] |
Schedule of Financial Data for Segments | The tables below show our financial data for our segments for the periods indicated (in millions).
| Year Ended December 31, 2015
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,089 |  |  | $ | 2,344 |  |  | $ | 2,039 |  |  | $ | — |  |  | $ | 6,472 |
Intersegment revenues | 5 |  |  | 15 |  |  | 8 |  |  | (28 | ) |  | — |
Total operating revenues | $ | 2,094 |  |  | $ | 2,359 |  |  | $ | 2,047 |  |  | $ | (28 | ) |  | $ | 6,472 |
Commodity Margin | $ | 1,106 |  |  | $ | 736 |  |  | $ | 944 |  |  | $ | — |  |  | $ | 2,786 |
Add: Mark-to-market commodity activity, net and other(1) | 160 |  |  | (120 | ) |  | (92 | ) |  | (29 | ) |  | (81 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 416 |  |  | 338 |  |  | 292 |  |  | (28 | ) |  | 1,018 |
Depreciation and amortization expense | 250 |  |  | 204 |  |  | 184 |  |  | — |  |  | 638 |
Sales, general and other administrative expense | 35 |  |  | 63 |  |  | 40 |  |  | — |  |  | 138 |
Other operating expenses | 37 |  |  | 9 |  |  | 36 |  |  | (2 | ) |  | 80 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (24 | ) |  | — |  |  | (24 | )
Income from operations | 528 |  |  | 2 |  |  | 324 |  |  | 1 |  |  | 855 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 624 |
Debt modification and extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 58 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 173 |
| Year Ended December 31, 2014
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,352 |  |  | $ | 3,229 |  |  | $ | 2,449 |  |  | $ | — |  |  | $ | 8,030 |
Intersegment revenues | 6 |  |  | 23 |  |  | 47 |  |  | (76 | ) |  | — |
Total operating revenues | $ | 2,358 |  |  | $ | 3,252 |  |  | $ | 2,496 |  |  | $ | (76 | ) |  | $ | 8,030 |
Commodity Margin(2) | $ | 1,050 |  |  | $ | 760 |  |  | $ | 949 |  |  | $ | — |  |  | $ | 2,759 |
Add: Mark-to-market commodity activity, net and other(1) | 220 |  |  | 142 |  |  | 48 |  |  | (31 | ) |  | 379 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 385 |  |  | 313 |  |  | 302 |  |  | (31 | ) |  | 969 |
Depreciation and amortization expense | 245 |  |  | 191 |  |  | 168 |  |  | (1 | ) |  | 603 |
Sales, general and other administrative expense | 41 |  |  | 64 |  |  | 39 |  |  | — |  |  | 144 |
Other operating expenses | 50 |  |  | 5 |  |  | 32 |  |  | 1 |  |  | 88 |
Impairment losses | — |  |  | — |  |  | 123 |  |  | — |  |  | 123 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (753 | ) |  | — |  |  | (753 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (25 | ) |  | — |  |  | (25 | )
Income from operations | 549 |  |  | 329 |  |  | 1,111 |  |  | — |  |  | 1,989 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 639 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 367 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 983 |
| Year Ended December 31, 2013
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,937 |  |  | $ | 2,347 |  |  | $ | 2,017 |  |  | $ | — |  |  | $ | 6,301 |
Intersegment revenues | 5 |  |  | (4 | ) |  | 117 |  |  | (118 | ) |  | — |
Total operating revenues | $ | 1,942 |  |  | $ | 2,343 |  |  | $ | 2,134 |  |  | $ | (118 | ) |  | $ | 6,301 |
Commodity Margin(2) | $ | 1,020 |  |  | $ | 632 |  |  | $ | 916 |  |  | $ | — |  |  | $ | 2,568 |
Add: Mark-to-market commodity activity, net and other(1) | (50 | ) |  | 51 |  |  | 27 |  |  | (31 | ) |  | (3 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 365 |  |  | 269 |  |  | 292 |  |  | (31 | ) |  | 895 |
Depreciation and amortization expense | 227 |  |  | 165 |  |  | 203 |  |  | (2 | ) |  | 593 |
Sales, general and other administrative expense | 37 |  |  | 56 |  |  | 42 |  |  | 1 |  |  | 136 |
Other operating expenses | 45 |  |  | 3 |  |  | 33 |  |  | — |  |  | 81 |
Impairment losses | 16 |  |  | — |  |  | — |  |  | — |  |  | 16 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (30 | ) |  | — |  |  | (30 | )
Income from operations | 280 |  |  | 190 |  |  | 403 |  |  | 1 |  |  | 874 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 690 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 164 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 20 |
__________
(1) | Includes $(2) million, $(5) million and $6 million of lease levelization and $20 million, $14 million and $14 million of amortization expense for the years ended December 31, 2015, 2014 and 2013, respectively.
(2) | Our East segment includes Commodity Margin of $81 million and $152 million for the years ended December 31, 2014 and 2013, respectively, related to the six power plants in our East segment that were sold in July 2014.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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