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Asset Impairments (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | $ 9,218 | $ 42
Total | 29,387 | 37,214
FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 8,082 | 33
Total | 1,555 | $ 9,703
OVEC | AE Supply |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 37 |
Coal generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 4,058 |
Coal generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 3,264 |
Nuclear generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 4,382 |
Nuclear generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 4,365 |
Gas/Hydro generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 266 |
Gas/Hydro generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 0 |
Nuclear Fuel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 243 |
Nuclear Fuel | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 243 |
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 269 |
Other | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 210 |
Materials and Supplies |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 142 |
Coal contracts | AE Supply |  |
Finite-Lived Intangible Assets [Line Items] |  |
Impairment | 55 |
Net Book Value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 11,786 |
Net Book Value | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 9,541 |
Net Book Value | Coal generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 4,672 |
Net Book Value | Coal generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 3,699 |
Net Book Value | Nuclear generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 4,842 |
Net Book Value | Nuclear generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 4,825 |
Net Book Value | Gas/Hydro generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 1,187 |
Net Book Value | Gas/Hydro generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 0 |
Net Book Value | Nuclear Fuel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 703 |
Net Book Value | Nuclear Fuel | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 703 |
Net Book Value | Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 382 |
Net Book Value | Other | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 314 |
Fair Value |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 2,568 |
Fair Value | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 1,459 |
Fair Value | Coal generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 614 |
Fair Value | Coal generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 435 |
Fair Value | Nuclear generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 460 |
Fair Value | Nuclear generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 460 |
Fair Value | Gas/Hydro generation assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 921 |
Fair Value | Gas/Hydro generation assets | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 0 |
Fair Value | Nuclear Fuel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 460 |
Fair Value | Nuclear Fuel | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 460 |
Fair Value | Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 113 |
Fair Value | Other | FES |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | $ 104 |

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