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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2017 USD ($) | Jan. 27, 2017 USD ($) | Dec. 09, 2016 USD ($) | Oct. 19, 2015 USD ($) | Jun. 19, 2015 | Oct. 10, 2013 proposal | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) program | Dec. 31, 2027 MW | Dec. 31, 2020 MW | Mar. 07, 2017 USD ($) MW
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of RFP's | proposal |  |  |  |  |  | 1 |  |  |  |  |
RFP term |  |  |  |  |  | 2 years |  |  |  |  |
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 |  |  |  |  |  |  |
LTIIP remaining recovery period | 4 years |  |  |  |  |  |  |  |  |  |
Pennsylvania | Pennsylvania Companies | PPUC | EE&C Phase III |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  | $ 390.0 |  |  |  |
Pennsylvania | ME |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  | $ 96.0 |  |  |  |  |  |  |  |  |
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) |  |  |  | $ 43.4 |  |  |  |  |  |  |
Per year proposed increase to spending | $ 8.2 |  |  |  |  |  |  |  |  |  |
Pennsylvania | Penn |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  | 29.0 |  |  |  |  |  |  |  |  |
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) |  |  |  | 56.4 |  |  |  |  |  |  |
Per year proposed increase to spending | 2.5 |  |  |  |  |  |  |  |  |  |
Pennsylvania | WP |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  | 66.0 |  |  |  |  |  |  |  |  |
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) |  |  |  | 88.3 |  |  |  |  |  |  |
Pennsylvania | PN |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  | $ 100.0 |  |  |  |  |  |  |  |  |
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) |  |  |  | $ 56.7 |  |  |  |  |  |  |
Per year proposed increase to spending | $ 3.3 |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of proposed efficient programs | program |  |  |  |  |  |  |  | 3 |  |  |
Energy efficient reduction requirement (percent) |  |  |  |  |  |  |  | 0.50% |  |  |
Expenditures for cost recovery program |  |  |  |  |  |  |  | $ 10.4 |  |  |
West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  | $ 25.0 |  |  |  |  |  |  |  |
Rate stabilization period |  |  | 2 years |  |  |  |  |  |  |  |
Scenario, Forecast | West Virginia | MP | WVPSC | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capacity shortfall (in MW's) | MW |  |  |  |  |  |  |  |  |  | 700 |
Scenario, Forecast | West Virginia | MP | WVPSC | IRP |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capacity shortfall (in MW's) | MW |  |  |  |  |  |  |  |  | 850 |  |
Pleasants Power Station |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  | 1,000
Held-for-sale | Pleasants Power Station |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  | $ 195.0

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