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Segment Information (Tables) | 9 Months Ended
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Sep. 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)
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,702 |  |  | $ | 285 |  |  | $ | 998 |  |  | $ | — |  |  | $ | (68 | ) |  | $ | 3,917 |
Internal revenues |  | — |  |  | — |  |  | 117 |  |  | — |  |  | (117 | ) |  | — |
Total revenues |  | 2,702 |  |  | 285 |  |  | 1,115 |  |  | — |  |  | (185 | ) |  | 3,917 |
Depreciation |  | 171 |  |  | 45 |  |  | 79 |  |  | 16 |  |  | — |  |  | 311 |
Amortization of regulatory assets, net |  | 98 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 98 |
Investment income |  | 13 |  |  | — |  |  | 23 |  |  | 2 |  |  | (10 | ) |  | 28 |
Interest expense |  | 139 |  |  | 43 |  |  | 48 |  |  | 56 |  |  | — |  |  | 286 |
Income taxes (benefits) |  | 167 |  |  | 45 |  |  | 49 |  |  | (11 | ) |  | 1 |  |  | 251 |
Net income (loss) |  | 283 |  |  | 78 |  |  | 86 |  |  | (67 | ) |  | — |  |  | 380 |
Total assets |  | 28,276 |  |  | 8,034 |  |  | 15,165 |  |  | 486 |  |  | — |  |  | 51,961 |
Total goodwill |  | 5,092 |  |  | 526 |  |  | — |  |  | — |  |  | — |  |  | 5,618 |
Property additions |  | 303 |  |  | 246 |  |  | 110 |  |  | 5 |  |  | — |  |  | 664 |
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 2,624 |  |  | $ | 248 |  |  | $ | 1,327 |  |  | $ | — |  |  | $ | (76 | ) |  | $ | 4,123 |
Internal revenues |  | — |  |  | — |  |  | 141 |  |  | — |  |  | (141 | ) |  | — |
Total revenues |  | 2,624 |  |  | 248 |  |  | 1,468 |  |  | — |  |  | (217 | ) |  | 4,123 |
Depreciation |  | 174 |  |  | 41 |  |  | 98 |  |  | 15 |  |  | — |  |  | 328 |
Amortization of regulatory assets, net |  | 110 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 110 |
Impairment of assets |  | 8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 8 |
Investment income (loss) |  | 8 |  |  | — |  |  | (19 | ) |  | (6 | ) |  | (11 | ) |  | (28 | )
Interest expense |  | 149 |  |  | 40 |  |  | 48 |  |  | 48 |  |  | — |  |  | 285 |
Income taxes (benefits) |  | 137 |  |  | 41 |  |  | 84 |  |  | (39 | ) |  | 3 |  |  | 226 |
Net income (loss) |  | 234 |  |  | 70 |  |  | 145 |  |  | (54 | ) |  | — |  |  | 395 |
Total assets |  | 27,883 |  |  | 6,988 |  |  | 16,229 |  |  | 830 |  |  | — |  |  | 51,930 |
Total goodwill |  | 5,092 |  |  | 526 |  |  | 800 |  |  | — |  |  | — |  |  | 6,418 |
Property additions |  | 292 |  |  | 149 |  |  | 83 |  |  | 15 |  |  | — |  |  | 539 |
For the Nine Months Ended |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 7,423 |  |  | $ | 824 |  |  | $ | 3,158 |  |  | $ | — |  |  | $ | (218 | ) |  | $ | 11,187 |
Internal revenues |  | — |  |  | — |  |  | 377 |  |  | — |  |  | (377 | ) |  | — |
Total revenues |  | 7,423 |  |  | 824 |  |  | 3,535 |  |  | — |  |  | (595 | ) |  | 11,187 |
Depreciation |  | 510 |  |  | 132 |  |  | 284 |  |  | 48 |  |  | — |  |  | 974 |
Amortization of regulatory assets, net |  | 218 |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 222 |
Impairment of assets (Note 2) |  | — |  |  | — |  |  | 1,447 |  |  | — |  |  | — |  |  | 1,447 |
Investment income |  | 37 |  |  | — |  |  | 56 |  |  | 13 |  |  | (31 | ) |  | 75 |
Interest expense |  | 431 |  |  | 128 |  |  | 143 |  |  | 161 |  |  | — |  |  | 863 |
Income taxes (benefits) |  | 349 |  |  | 130 |  |  | (96 | ) |  | (51 | ) |  | 2 |  |  | 334 |
Net income (loss) |  | 594 |  |  | 223 |  |  | (1,029 | ) |  | (169 | ) |  | — |  |  | (381 | )
Property additions |  | 878 |  |  | 755 |  |  | 492 |  |  | 31 |  |  | — |  |  | 2,156 |
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
External revenues |  | $ | 7,425 |  |  | $ | 755 |  |  | $ | 3,536 |  |  | $ | — |  |  | $ | (231 | ) |  | $ | 11,485 |
Internal revenues |  | — |  |  | — |  |  | 563 |  |  | — |  |  | (563 | ) |  | — |
Total revenues |  | 7,425 |  |  | 755 |  |  | 4,099 |  |  | — |  |  | (794 | ) |  | 11,485 |
Depreciation |  | 516 |  |  | 116 |  |  | 293 |  |  | 44 |  |  | — |  |  | 969 |
Amortization of regulatory assets, net |  | 196 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | 201 |
Impairment of assets |  | 8 |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | 24 |
Investment income (loss) |  | 33 |  |  | — |  |  | (7 | ) |  | (9 | ) |  | (31 | ) |  | (14 | )
Interest expense |  | 439 |  |  | 119 |  |  | 144 |  |  | 144 |  |  | — |  |  | 846 |
Income taxes (benefits) |  | 350 |  |  | 135 |  |  | 76 |  |  | (84 | ) |  | 8 |  |  | 485 |
Net income (loss) |  | 598 |  |  | 231 |  |  | 129 |  |  | (154 | ) |  | — |  |  | 804 |
Property additions |  | 884 |  |  | 700 |  |  | 400 |  |  | 41 |  |  | — |  |  | 2,025 |

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