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Asset Impairments (Tables) | 6 Months Ended
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Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill by Segment | The changes in the carrying amount of goodwill for the six months ended June 30, 2016 were as follows:
Goodwill |  | Regulated Distribution |  | Regulated Transmission |  | Competitive Energy Services |  | Consolidated
|  | (In millions)
Balance as of December 31, 2015 |  | $ | 5,092 |  |  | $ | 526 |  |  | $ | 800 |  |  | $ | 6,418 |
Impairment |  | — |  |  | — |  |  | (800 | ) |  | (800 | )
Balance as of June 30, 2016 |  | $ | 5,092 |  |  | $ | 526 |  |  | $ | — |  |  | $ | 5,618 |

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