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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 09, 2016 USD ($) | Nov. 21, 2016 brief | Oct. 14, 2016 USD ($) proceeding Party | Sep. 28, 2016 USD ($) | Aug. 22, 2016 USD ($) | Aug. 16, 2016 USD ($) | Aug. 05, 2016 MW | Apr. 28, 2016 USD ($) | Nov. 03, 2015 proposal | Oct. 19, 2015 USD ($) | Jun. 19, 2015 | Jun. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) proposal program | Dec. 31, 2027 MW | Dec. 31, 2020 MW | Feb. 03, 2017 Party | Dec. 01, 2016 Party
Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project term |  |  |  |  |  |  |  |  | 2 years |  |  |  |  | 2 years |  |  |  |
Number of requests for proposal | proposal |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  | 1 |  |  |  |
Pennsylvania | 3 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |
Pennsylvania | 12 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  | 12 months |  |  |  |  | 12 months |  |  |  |
Pennsylvania | 24 Month Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy contract term |  |  |  |  |  |  |  |  | 24 months |  |  |  |  | 24 months |  |  |  |
Pennsylvania | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential cost of compliance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 174,000 |  |  |  |
Pennsylvania | ME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ 140,200 |  |  |  |  |  |  |  |  |  |
Interim amount of rate increase (decrease) |  |  | $ 96,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | 42,000 |  |  |  |  |  |  |  |  |  |
Interim amount of rate increase (decrease) |  |  | 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | WP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | 98,200 |  |  |  |  |  |  |  |  |  |
Interim amount of rate increase (decrease) |  |  | 66,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | PN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ 158,800 |  |  |  |  |  |  |  |  |  |
Interim amount of rate increase (decrease) |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LTIP recovery period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Pennsylvania | PPUC | DSIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Pending Proceedings, Number Consolidated | proceeding |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | PPUC | DSIC Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Parties Who Filed A Brief | Party |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Loss Contingency, Claims Dismissed, Number | brief |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | PPUC | ME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed ROE (percent) |  |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |
Energy consumption reduction targets (percent) |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | $ 43,440 |  |  |  |  |  |  |  |
Pennsylvania | PPUC | Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed ROE (percent) |  |  |  |  |  |  |  |  |  |  | 1.70% |  |  |  |  |  |  |
Energy consumption reduction targets (percent) |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | 56,350 |  |  |  |  |  |  |  |
Pennsylvania | PPUC | WP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed ROE (percent) |  |  |  |  |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |
Energy consumption reduction targets (percent) |  |  |  |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | 88,340 |  |  |  |  |  |  |  |
Pennsylvania | PPUC | PN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed ROE (percent) |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Energy consumption reduction targets (percent) |  |  |  |  |  |  |  |  |  |  | 3.90% |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | $ 56,740 |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of proposed efficient programs | program |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Energy efficient reduction requirement (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |
Expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,400 |  |  |  |
Minimum energy requirement to file and implement a RFP (in MW's) | MW |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |
Actual under-recovery balance |  |  |  |  |  |  |  |  |  |  |  | $ 119,000 |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | ENEC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 65,000 |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (percent) |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate stability period | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | ENEC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected over-recovery amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 54,000 |  |  |  |  |
West Virginia | WVPSC | MP and PE | Modernization and Improvement Plan for Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 6,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (percent) |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity shortfall (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700 |  |
West Virginia | WVPSC | MP | IRP | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity shortfall (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 850 |  |  |
Subsequent Event | Pennsylvania | PPUC | DSIC Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Number of Parties Who Filed A Brief | Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |

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