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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions						1 Months Ended	9 Months Ended	12 Months Ended
	Sep. 01, 2017 USD ($)	Jun. 14, 2017 USD ($)	Jan. 27, 2017 USD ($)	Dec. 09, 2016 USD ($)	Jun. 19, 2015	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($) proposal	Dec. 31, 2019 USD ($)	Dec. 31, 2027 MW	Dec. 31, 2020 MW	Mar. 06, 2017 USD ($) MW	Sep. 23, 2016 program
Pennsylvania
Regulatory Matters [Line Items]
Number of RFP's | proposal							1
RFP term							2 years
Pennsylvania | Twelve month period
Regulatory Matters [Line Items]
Term of energy contract							12 months
Pennsylvania | Twenty-four month period
Regulatory Matters [Line Items]
Term of energy contract							24 months
Pennsylvania | PPUC
Regulatory Matters [Line Items]
LTIIP recovery period		5 years
Pennsylvania | Pennsylvania Companies | PPUC | EE&C Phase III
Regulatory Matters [Line Items]
Approved amount of annual increase						$ 390.0
Pennsylvania | ME
Regulatory Matters [Line Items]
Approved amount of annual increase			$ 96.0
Pennsylvania | ME | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed					1.80%
Energy consumption reduction targets proposed					4.00%
Amount of requested rate increase (decrease)		$ 51.6
Pennsylvania | Penn
Regulatory Matters [Line Items]
Approved amount of annual increase			29.0
Pennsylvania | Penn | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed					1.70%
Energy consumption reduction targets proposed					3.30%
Amount of requested rate increase (decrease)		58.9
Pennsylvania | WP
Regulatory Matters [Line Items]
Approved amount of annual increase			66.0
Pennsylvania | WP | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed					1.80%
Energy consumption reduction targets proposed					2.60%
Amount of requested rate increase (decrease)		88.3
Pennsylvania | PN
Regulatory Matters [Line Items]
Approved amount of annual increase			$ 100.0
Pennsylvania | PN | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed					0.00%
Energy consumption reduction targets proposed					3.90%
Amount of requested rate increase (decrease)		$ 60.0
West Virginia | WVPSC | VMP Surcharge Rates
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ (15.0)
Requested rate decrease	1.00%
West Virginia | MP and PE | WVPSC
Regulatory Matters [Line Items]
Number of proposed efficient programs | program												3
Energy efficient reduction requirement (percent)												0.50%
Expenditures for cost recovery program							$ 10.4
West Virginia | MP and PE | WVPSC | ENEC
Regulatory Matters [Line Items]
Approved amount of annual increase				$ 25.0
Rate stabilization period				2 years
Scenario, Forecast | West Virginia | WVPSC | VMP Surcharge Rates
Regulatory Matters [Line Items]
Amount of additional requested rate increase (decrease)								$ (15.0)
Scenario, Forecast | West Virginia | MP | WVPSC | Accelerated Recovery Costs For Modernizing and Improving Coal-Fired Boilers
Regulatory Matters [Line Items]
Capacity shortfall (in MW's) | MW										700
Scenario, Forecast | West Virginia | MP | WVPSC | IRP
Regulatory Matters [Line Items]
Capacity shortfall (in MW's) | MW									850
Pleasants Power Station
Regulatory Matters [Line Items]
Plant capacity (in MW's) | MW											1,300
Held-for-sale | Pleasants Power Station
Regulatory Matters [Line Items]
Assets held for sale											$ 195.0

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