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Regulatory Matters - Reliability Matters and FERC (Details) $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 24, 2016 USD ($) | Sep. 14, 2015 | Aug. 24, 2012 USD ($) | Sep. 30, 2016 USD ($) entities subsidiary
Regulatory Matters [Line Items] |  |  |  |
Regional enforcement entities | entities |  |  |  | 8
FERC |  |  |  |
Regulatory Matters [Line Items] |  |  |  |
Denied recovery charges of exit fees |  |  |  | $ 78.8
FERC | California Claims Matters | Settled Litigation |  |  |  |
Regulatory Matters [Line Items] |  |  |  |
Settlement amount | $ 3.6 |  |  |
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 | PATH Transmission Project |  |  |  |
Regulatory Matters [Line Items] |  |  |  |
Proposed return on equity |  |  | 10.90% |
Requested return on equity (percent) |  |  | 10.40% |
Return on equity granted 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

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