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Commitments, Guarantees and Contingencies - Clean Air Act and Climate Change (Details) T in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 phase T | Dec. 31, 2018 USD ($) | Nov. 12, 2014
Loss Contingencies [Line Items] |  |  |
Proposed reduction in power plants carbon pollution (percent) | 90.00% |  |
National Ambient Air Quality Standards |  |  |
Loss Contingencies [Line Items] |  |  |
Capping of SO2 Emissions Under CSAPR | 2.4 |  |
Capping of NOx emissions under CSAPR | 1.2 |  |
National Ambient Air Quality Standards | CSAPR |  |  |
Loss Contingencies [Line Items] |  |  |
Number of phases under the EPA’s CAIR for reductions of Sulfur Dioxide and Mono-Nitrogen Oxides | phase | 2 |  |
Minimum | Climate Change |  |  |
Loss Contingencies [Line Items] |  |  |
Reduction in emissions (percent) |  |  | 26.00%
Maximum | Climate Change |  |  |
Loss Contingencies [Line Items] |  |  |
Reduction in emissions (percent) |  |  | 28.00%
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |
Loss Contingencies [Line Items] |  |  |
Amount of damages awarded to other party | $ |  | $ 66 |

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