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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 14, 2016 USD ($) item brief | Sep. 28, 2016 USD ($) | Aug. 22, 2016 USD ($) | Aug. 16, 2016 USD ($) | Aug. 05, 2016 MW | Jul. 07, 2016 | Apr. 28, 2016 USD ($) | Oct. 19, 2015 USD ($) | Jun. 19, 2015 | Oct. 10, 2013 proposal | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) program | Dec. 31, 2017 USD ($) | Dec. 31, 2027 MW | Dec. 31, 2020 MW
Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of requests for proposal | proposal |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Request for proposal project term |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Pennsylvania | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum range of possible loss |  |  |  |  |  |  |  |  |  |  |  | $ 175,000 |  |  |
Pennsylvania | Three month period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |
Pennsylvania | Twelve month period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |
Pennsylvania | Twenty-four month period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |
Pennsylvania | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTIIP recovery period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Pennsylvania | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested reinvestment of CTA (percent) |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Pennsylvania | Pennsylvania Companies | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of items related to the calculation of rates | item | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of parties who filed a brief | brief | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | ME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | $ 140,200 |  |  |  |  |  |  |  |
Pennsylvania | ME | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of rate increase waiting approval | $ 96,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | ME | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |
Energy consumption reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  | $ 43,440 |  |  |  |  |  |  |
Pennsylvania | Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | 42,000 |  |  |  |  |  |  |  |
Pennsylvania | Penn | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of rate increase waiting approval | 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Penn | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 1.70% |  |  |  |  |  |
Energy consumption reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  | 56,350 |  |  |  |  |  |  |
Pennsylvania | WP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | 98,200 |  |  |  |  |  |  |  |
Pennsylvania | WP | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of rate increase waiting approval | 66,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | WP | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |
Energy consumption reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  | 88,340 |  |  |  |  |  |  |
Pennsylvania | PN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | $ 158,800 |  |  |  |  |  |  |  |
Pennsylvania | PN | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of rate increase waiting approval | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | PN | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Energy consumption reduction targets proposed return on equity (percent) |  |  |  |  |  |  |  |  | 3.90% |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  | $ 56,740 |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy efficient reduction requirement (percent) |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  | $ 10,400 |  |  |
Minimum energy requirement to file and implement a request for proposal | MW |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |
Actual under-recovery balance |  |  |  |  |  |  |  |  |  |  | $ 119,000 |  |  |  |
Number of proposed efficient programs | program |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  | $ 65,000 |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (percent) |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Modernization and Improvement Plan for Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ 6,900 |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (percent) |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 7,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected rate over-recovery |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,000 |  |
Scenario, Forecast | West Virginia | MP and PE | WVPSC | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utility, Capacity Shortfall | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700
Scenario, Forecast | West Virginia | MP | WVPSC | IRP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utility, Capacity Shortfall | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 850 |

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