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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,262 |  |  | $ | 327 |  |  | $ | 778 |  |  | $ | — |  |  | $ | (58 | ) |  | $ | 3,309 |
Internal revenues |  | — |  |  | — |  |  | 86 |  |  | — |  |  | (86 | ) |  | — |
Total revenues |  | 2,262 |  |  | 327 |  |  | 864 |  |  | — |  |  | (144 | ) |  | 3,309 |
Depreciation |  | 179 |  |  | 54 |  |  | 29 |  |  | 19 |  |  | — |  |  | 281 |
Amortization of regulatory assets, net |  | 62 |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | 65 |
Impairment of assets (Note 14) |  | — |  |  | — |  |  | 131 |  |  | — |  |  | — |  |  | 131 |
Investment income |  | 14 |  |  | — |  |  | 12 |  |  | 2 |  |  | (11 | ) |  | 17 |
Interest expense |  | 134 |  |  | 39 |  |  | 47 |  |  | 70 |  |  | — |  |  | 290 |
Income taxes (benefits) |  | 121 |  |  | 53 |  |  | (30 | ) |  | (27 | ) |  | — |  |  | 117 |
Net income (loss) |  | 205 |  |  | 92 |  |  | (56 | ) |  | (67 | ) |  | — |  |  | 174 |
Total assets |  | 27,660 |  |  | 9,142 |  |  | 5,887 |  |  | 638 |  |  | — |  |  | 43,327 |
Total goodwill |  | 5,004 |  |  | 614 |  |  | — |  |  | — |  |  | — |  |  | 5,618 |
Property additions |  | 304 |  |  | 245 |  |  | 96 |  |  | 21 |  |  | — |  |  | 666 |
June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,189 |  |  | $ | 275 |  |  | $ | 1,008 |  |  | $ | — |  |  | $ | (71 | ) |  | $ | 3,401 |
Internal revenues |  | — |  |  | — |  |  | 108 |  |  | — |  |  | (108 | ) |  | — |
Total revenues |  | 2,189 |  |  | 275 |  |  | 1,116 |  |  | — |  |  | (179 | ) |  | 3,401 |
Depreciation |  | 168 |  |  | 46 |  |  | 103 |  |  | 17 |  |  | — |  |  | 334 |
Amortization of regulatory assets, net |  | 61 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | 63 |
Impairment of assets (Note 14) |  | — |  |  | — |  |  | 1,447 |  |  | — |  |  | — |  |  | 1,447 |
Investment income |  | 13 |  |  | — |  |  | 18 |  |  | — |  |  | (12 | ) |  | 19 |
Interest expense |  | 148 |  |  | 39 |  |  | 48 |  |  | 54 |  |  | — |  |  | 289 |
Income taxes (benefits) |  | 80 |  |  | 46 |  |  | (230 | ) |  | (26 | ) |  | — |  |  | (130 | )
Net income (loss) |  | 139 |  |  | 78 |  |  | (1,259 | ) |  | (47 | ) |  | — |  |  | (1,089 | )
Total assets |  | 27,448 |  |  | 8,314 |  |  | 15,464 |  |  | 175 |  |  | — |  |  | 51,401 |
Total goodwill |  | 5,004 |  |  | 614 |  |  | — |  |  | — |  |  | — |  |  | 5,618 |
Property additions |  | 287 |  |  | 277 |  |  | 213 |  |  | 17 |  |  | — |  |  | 794 |
For the Six Months Ended |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 4,752 |  |  | $ | 640 |  |  | $ | 1,592 |  |  | $ | — |  |  | $ | (123 | ) |  | $ | 6,861 |
Internal revenues |  | — |  |  | — |  |  | 203 |  |  | — |  |  | (203 | ) |  | — |
Total revenues |  | 4,752 |  |  | 640 |  |  | 1,795 |  |  | — |  |  | (326 | ) |  | 6,861 |
Depreciation |  | 357 |  |  | 105 |  |  | 57 |  |  | 37 |  |  | — |  |  | 556 |
Amortization of regulatory assets, net |  | 119 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | 124 |
Impairment of assets (Note 14) |  | — |  |  | — |  |  | 131 |  |  | — |  |  | — |  |  | 131 |
Investment income |  | 28 |  |  | — |  |  | 32 |  |  | 5 |  |  | (24 | ) |  | 41 |
Interest expense |  | 272 |  |  | 78 |  |  | 92 |  |  | 135 |  |  | — |  |  | 577 |
Income taxes (benefits) |  | 259 |  |  | 105 |  |  | (65 | ) |  | (56 | ) |  | — |  |  | 243 |
Net income (loss) |  | 442 |  |  | 180 |  |  | (123 | ) |  | (120 | ) |  | — |  |  | 379 |
Property additions |  | 568 |  |  | 469 |  |  | 188 |  |  | 29 |  |  | — |  |  | 1,254 |
June 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 4,699 |  |  | $ | 561 |  |  | $ | 2,160 |  |  | $ | — |  |  | $ | (150 | ) |  | $ | 7,270 |
Internal revenues |  | — |  |  | — |  |  | 260 |  |  | — |  |  | (260 | ) |  | — |
Total revenues |  | 4,699 |  |  | 561 |  |  | 2,420 |  |  | — |  |  | (410 | ) |  | 7,270 |
Depreciation |  | 335 |  |  | 91 |  |  | 205 |  |  | 32 |  |  | — |  |  | 663 |
Amortization of regulatory assets, net |  | 120 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 124 |
Impairment of assets (Note 14) |  | — |  |  | — |  |  | 1,447 |  |  | — |  |  | — |  |  | 1,447 |
Investment income |  | 24 |  |  | — |  |  | 33 |  |  | 11 |  |  | (21 | ) |  | 47 |
Interest expense |  | 298 |  |  | 79 |  |  | 95 |  |  | 105 |  |  | — |  |  | 577 |
Income taxes (benefits) |  | 174 |  |  | 93 |  |  | (145 | ) |  | (39 | ) |  | — |  |  | 83 |
Net income (loss) |  | 297 |  |  | 159 |  |  | (1,115 | ) |  | (102 | ) |  | — |  |  | (761 | )
Property additions |  | 528 |  |  | 556 |  |  | 382 |  |  | 26 |  |  | — |  |  | 1,492 |

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