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Regulatory Matters - Reliability Matters and FERC (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 13, 2017 | Aug. 30, 2017 USD ($) | Mar. 10, 2017 | Feb. 21, 2017 | Jan. 19, 2017 | Aug. 04, 2014 | Jan. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) entity condition subsidiary | Sep. 30, 2016 USD ($) | Dec. 31, 2012 USD ($)
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Regional enforcement entities | entity |  |  |  |  |  |  |  |  | 8 |  |
Impairment of assets (Note 14) |  |  |  |  |  |  |  |  | $ 162.0 | $ 1,447.0 |
Purchase Agreement with Aspen Generating, LLC |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  | $ 825.0 |  |  |  |  | $ 925.0 |  |  |  |
FES |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets (Note 14) |  |  |  |  |  |  |  |  | 0.0 | $ 540.0 |
MAIT |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets (Note 14) |  |  |  |  |  |  |  | $ 13.0 |  |  |
FERC |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Denied recovery charges of exit fees |  |  |  |  |  |  |  | 78.8 | $ 78.8 |  |
Number of conditions | condition |  |  |  |  |  |  |  |  | 1 |  |
Market-based rate authority renewal period |  |  |  |  |  |  |  |  | 3 years |  |
FERC | PATH-Allegheny | PATH Transmission Project |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost recovery, PP&E reclassified to Regulatory Assets |  |  |  |  |  |  |  |  |  |  | $ 62.0
FERC | Path-WV | PATH Transmission Project |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost recovery, PP&E reclassified to Regulatory Assets |  |  |  |  |  |  |  |  |  |  | $ 59.0
FERC | PATH |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  |  |  |  | 8.11% |  |  |  |  |  |
Requested return on equity |  |  |  | 10.40% |  |  |  |  |  |  | 10.40%
FERC | PATH | PATH Transmission Project |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed return on equity |  |  |  |  |  |  |  |  |  |  | 10.90%
Requested return on equity |  |  |  |  |  |  |  |  |  |  | 10.40%
Return on equity granted for regional transmission organization participation |  |  |  |  |  |  |  |  |  |  | 0.50%
Return on equity denied for regional transmission organization participation |  |  |  |  |  |  |  |  |  |  | 0.50%
Remaining recovery period of regulatory assets |  |  |  |  |  |  |  |  |  |  | 5 years
FERC | FET |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of stand-alone transmission subsidiaries | subsidiary |  |  |  |  |  |  |  |  | 2 |  |
FERC | The Ohio Companies | ESP IV PPA |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of proposed purchase power agreement |  |  |  |  |  | 8 years |  |  |  |  |
FERC | MAIT |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved suspension period |  |  | 5 months |  |  |  |  |  |  |  |
Approved ROE |  |  |  |  |  |  |  |  | 11.00% |  |
Impairment of assets (Note 14) |  |  |  |  |  |  |  | $ 13.0 |  |  |
FERC | MAIT | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved ROE | 10.30% |  |  |  |  |  |  |  |  |  |
Approved equity capital structure | 60.00% |  |  |  |  |  |  |  |  |  |
FERC | JCP&L |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved suspension period |  |  | 5 months |  |  |  |  |  |  |  |

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