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Fair Value Measurements (Details 5) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Carrying Value |  |
Fair value and related carrying amounts of long-term debt and other long-term obligations |  |
Long-term debt and other long-term obligations | $ 19,745 | $ 20,244
Carrying Value | FES |  |
Fair value and related carrying amounts of long-term debt and other long-term obligations |  |
Long-term debt and other long-term obligations | 3,003 | 3,027
Fair Value |  |
Fair value and related carrying amounts of long-term debt and other long-term obligations |  |
Long-term debt and other long-term obligations | 21,465 | 21,519
Fair Value | FES |  |
Fair value and related carrying amounts of long-term debt and other long-term obligations |  |
Long-term debt and other long-term obligations | $ 2,662 | $ 3,121

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