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Capitalization (Details 1) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Capitalization [Line Items] |  |
Secured notes | $ 2,305 | $ 2,098
Unsecured debt | 14,258 | 14,872
Capital lease obligations | 104 | 132
Unamortized debt premiums (discounts) | (25) | (18)
Unamortized debt issuance costs | (87) | (93)
Unamortized fair value adjustments | (6) | 5
Currently payable long-term debt | (1,685) | (1,166)
Total long-term debt and other long-term obligations | 18,192 | 19,099
FES |  |
Schedule of Capitalization [Line Items] |  |
Secured notes | 627 | 342
Unsecured debt | 2,373 | 2,685
Capital lease obligations | 8 | 13
Unamortized debt premiums (discounts) | (1) | (1)
Unamortized debt issuance costs | (15) | (17)
Currently payable long-term debt | (179) | (512)
Total long-term debt and other long-term obligations | 2,813 | 2,510
FMBs |  |
Schedule of Capitalization [Line Items] |  |
FMBs | $ 3,328 | 3,269
FMBs | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 3.34% |
FMBs | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 9.74% |
Secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Secured notes | $ 2,295 | 2,096
Secured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 0.679% |
Secured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 12.00% |
Secured notes - fixed rate | FES |  |
Schedule of Capitalization [Line Items] |  |
Secured notes | $ 617 | 340
Secured notes - fixed rate | FES | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 4.25% |
Secured notes - fixed rate | FES | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 12.00% |
Secured notes - variable rate |  |
Schedule of Capitalization [Line Items] |  |
Secured notes | $ 10 | 2
Secured notes - variable rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 3.50% |
Secured notes - variable rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 3.50% |
Secured notes - variable rate | FES |  |
Schedule of Capitalization [Line Items] |  |
Secured notes | $ 10 | 2
Secured notes - variable rate | FES | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 3.50% |
Secured notes - variable rate | FES | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 3.50% |
Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Unsecured debt | $ 13,058 | 13,580
Unsecured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.15% |
Unsecured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 7.70% |
Unsecured notes - fixed rate | FES |  |
Schedule of Capitalization [Line Items] |  |
Unsecured debt | $ 2,373 | 2,593
Unsecured notes - fixed rate | FES | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.15% |
Unsecured notes - fixed rate | FES | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 6.80% |
Unsecured notes - variable rate |  |
Schedule of Capitalization [Line Items] |  |
Unsecured debt | $ 1,200 | 1,292
Unsecured notes - variable rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.34% |
Unsecured notes - variable rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.43% |
Unsecured notes - variable rate | FES |  |
Schedule of Capitalization [Line Items] |  |
Unsecured debt | $ 0 | $ 92

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