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Fair Value Measurements (Details 5) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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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 | $ 19,088 | $ 18,315
Carrying Value | ME, JCP&L and FET |  |
Fair value and related carrying amounts of long-term debt and other long-term obligations |  |
Long-term debt and other long-term obligations | 1,400 |
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 | $ 20,691 | $ 19,266

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