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Transactions With Affiliated Companies (Details) - FES T in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) T | Dec. 31, 2015 USD ($) T | Dec. 31, 2014 USD ($) T
Investment Income: |  |  |
Interest income from FE | $ 2.0 | $ 2.0 | $ 3.0
Interest Expense: |  |  |
Interest expense to affiliates | 5.0 | 4.0 | 3.0
Interest expense to FE | 2.0 | 3.0 | 4.0
AE Supply |  |  |
REVENUES: |  |  |
Revenues | $ 80.4 | $ 62.8 | $ 96.3
Interest Expense: |  |  |
Amount of coal sold under purchase agreement (in T) | T | 1.5 | 1.2 | 1.7
Electric sales to affiliates |  |  |
REVENUES: |  |  |
Revenues | $ 457.0 | $ 664.0 | $ 861.0
Other |  |  |
REVENUES: |  |  |
Revenues | 11.0 | 14.0 | 15.0
Purchased power from affiliates |  |  |
Expenses: |  |  |
Expenses | 622.0 | 353.0 | 271.0
Fuel |  |  |
Expenses: |  |  |
Expenses | 4.0 | 1.0 | 1.0
Support services |  |  |
Expenses: |  |  |
Expenses | 748.0 | 705.0 | 619.0
Pension and OPEB mark-to-market adjustment |  |  |
Expenses: |  |  |
Expenses | $ 71.0 | $ 76.0 | $ 257.0

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