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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2016
Segment Reporting [Abstract] |
Segment Financial Information | Segment Financial Information
For the Three Months Ended |  | Regulated Distribution |  | Regulated Transmission |  | Competitive Energy Services |  | Corporate/ Other |  | Reconciling Adjustments |  | Consolidated
|  | (In millions)
June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,200 |  |  | $ | 264 |  |  | $ | 1,008 |  |  | $ | (39 | ) |  | $ | (32 | ) |  | $ | 3,401 |
Internal revenues |  | — |  |  | — |  |  | 108 |  |  | — |  |  | (108 | ) |  | — |
Total revenues |  | 2,200 |  |  | 264 |  |  | 1,116 |  |  | (39 | ) |  | (140 | ) |  | 3,401 |
Depreciation |  | 170 |  |  | 44 |  |  | 103 |  |  | 17 |  |  | — |  |  | 334 |
Amortization of regulatory assets, net |  | 61 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 63 |
Impairment of assets (Note 2) |  | — |  |  | — |  |  | 1,447 |  |  | — |  |  | — |  |  | 1,447 |
Investment income |  | 13 |  |  | — |  |  | 18 |  |  | — |  |  | (12 | ) |  | 19 |
Interest expense |  | 145 |  |  | 42 |  |  | 48 |  |  | 54 |  |  | — |  |  | 289 |
Income taxes (benefits) |  | 84 |  |  | 42 |  |  | (230 | ) |  | (27 | ) |  | 1 |  |  | (130 | )
Net income (loss) |  | 146 |  |  | 71 |  |  | (1,259 | ) |  | (47 | ) |  | — |  |  | (1,089 | )
Total assets |  | 27,907 |  |  | 7,855 |  |  | 15,464 |  |  | 175 |  |  | — |  |  | 51,401 |
Total goodwill |  | 5,092 |  |  | 526 |  |  | — |  |  | — |  |  | — |  |  | 5,618 |
Property additions |  | 313 |  |  | 251 |  |  | 213 |  |  | 17 |  |  | — |  |  | 794 |
June 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,239 |  |  | $ | 269 |  |  | $ | 1,034 |  |  | $ | (42 | ) |  | $ | (35 | ) |  | $ | 3,465 |
Internal revenues |  | — |  |  | — |  |  | 162 |  |  | — |  |  | (162 | ) |  | — |
Total revenues |  | 2,239 |  |  | 269 |  |  | 1,196 |  |  | (42 | ) |  | (197 | ) |  | 3,465 |
Depreciation |  | 170 |  |  | 38 |  |  | 99 |  |  | 15 |  |  | — |  |  | 322 |
Amortization of regulatory assets, net |  | 57 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 59 |
Impairment of assets |  | — |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Investment income (loss) |  | 12 |  |  | — |  |  | — |  |  | (5 | ) |  | (10 | ) |  | (3 | )
Interest expense |  | 146 |  |  | 40 |  |  | 48 |  |  | 49 |  |  | (1 | ) |  | 282 |
Income taxes (benefits) |  | 91 |  |  | 52 |  |  | (4 | ) |  | (22 | ) |  | (2 | ) |  | 115 |
Net income (loss) |  | 156 |  |  | 89 |  |  | (8 | ) |  | (50 | ) |  | — |  |  | 187 |
Total assets |  | 28,006 |  |  | 6,855 |  |  | 16,417 |  |  | 893 |  |  | — |  |  | 52,171 |
Total goodwill |  | 5,092 |  |  | 526 |  |  | 800 |  |  | — |  |  | — |  |  | 6,418 |
Property additions |  | 312 |  |  | 297 |  |  | 191 |  |  | 18 |  |  | — |  |  | 818 |
For the Six Months Ended |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 4,721 |  |  | $ | 539 |  |  | $ | 2,160 |  |  | $ | (81 | ) |  | $ | (69 | ) |  | $ | 7,270 |
Internal revenues |  | — |  |  | — |  |  | 260 |  |  | — |  |  | (260 | ) |  | — |
Total revenues |  | 4,721 |  |  | 539 |  |  | 2,420 |  |  | (81 | ) |  | (329 | ) |  | 7,270 |
Depreciation |  | 339 |  |  | 87 |  |  | 205 |  |  | 32 |  |  | — |  |  | 663 |
Amortization of regulatory assets, net |  | 120 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 124 |
Impairment of assets (Note 2) |  | — |  |  | — |  |  | 1,447 |  |  | — |  |  | — |  |  | 1,447 |
Investment income |  | 24 |  |  | — |  |  | 33 |  |  | 11 |  |  | (21 | ) |  | 47 |
Interest expense |  | 292 |  |  | 85 |  |  | 95 |  |  | 105 |  |  | — |  |  | 577 |
Income taxes (benefits) |  | 182 |  |  | 85 |  |  | (145 | ) |  | (40 | ) |  | 1 |  |  | 83 |
Net income (loss) |  | 311 |  |  | 145 |  |  | (1,115 | ) |  | (102 | ) |  | — |  |  | (761 | )
Property additions |  | 575 |  |  | 509 |  |  | 382 |  |  | 26 |  |  | — |  |  | 1,492 |
June 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 4,801 |  |  | $ | 507 |  |  | $ | 2,209 |  |  | $ | (84 | ) |  | $ | (71 | ) |  | $ | 7,362 |
Internal revenues |  | — |  |  | — |  |  | 422 |  |  | — |  |  | (422 | ) |  | — |
Total revenues |  | 4,801 |  |  | 507 |  |  | 2,631 |  |  | (84 | ) |  | (493 | ) |  | 7,362 |
Depreciation |  | 342 |  |  | 75 |  |  | 195 |  |  | 29 |  |  | — |  |  | 641 |
Amortization of regulatory assets, net |  | 86 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | 91 |
Impairment of assets |  | — |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Investment income (loss) |  | 25 |  |  | — |  |  | 12 |  |  | (3 | ) |  | (20 | ) |  | 14 |
Interest expense |  | 290 |  |  | 79 |  |  | 96 |  |  | 96 |  |  | — |  |  | 561 |
Income taxes (benefits) |  | 213 |  |  | 94 |  |  | (8 | ) |  | (40 | ) |  | — |  |  | 259 |
Net income (loss) |  | 364 |  |  | 161 |  |  | (16 | ) |  | (100 | ) |  | — |  |  | 409 |
Property additions |  | 592 |  |  | 551 |  |  | 317 |  |  | 26 |  |  | — |  |  | 1,486 |

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