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Commitments, Guarantees and Contingencies - Clean Air Act and Climate Change (Details) T in Millions, $ in Millions					3 Months Ended	12 Months Ended
	Apr. 06, 2018 USD ($)	Feb. 18, 2018 USD ($)	May 01, 2017 installment	Oct. 01, 2015	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) phase T	Nov. 12, 2014
Loss Contingencies [Line Items]
Proposed reduction in power plants carbon pollution (percent)						90.00%
AE Supply
Loss Contingencies [Line Items]
Amount of damages awarded to other party		$ 93
National Ambient Air Quality Standards
Loss Contingencies [Line Items]
Capping of SO2 Emissions Under CSAPR | T						2.4
Capping of NOx emissions under CSAPR | T						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%
EPA | Caa Compliance
Loss Contingencies [Line Items]
Number of installment payments | installment			3
Period of time to implement plan				3 years
Settled Litigation | Caa Compliance
Loss Contingencies [Line Items]
Loss in period					$ 109
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC
Loss Contingencies [Line Items]
Amount of damages awarded to other party						$ 66
Settlement payments	$ 72

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