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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions							1 Months Ended	3 Months Ended
	Mar. 01, 2017 USD ($)	Jan. 27, 2017 USD ($)	Dec. 09, 2016 USD ($)	Oct. 19, 2015 USD ($)	Jun. 19, 2015	Oct. 10, 2013 proposal	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) program	Dec. 31, 2027 MW	Dec. 31, 2020 MW	Mar. 07, 2017 USD ($) MW
Pennsylvania
Regulatory Matters [Line Items]
Number of RFP's | proposal						1
RFP term						2 years
Pennsylvania | Three month period
Regulatory Matters [Line Items]
Term of energy contract						3 months
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
LTIIP remaining recovery period	4 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 return on equity (percent)					1.80%
Energy consumption reduction targets proposed return on equity (percent)					4.00%
Amount of requested rate increase (decrease)				$ 43.4
Per year proposed increase to spending	$ 8.2
Pennsylvania | Penn
Regulatory Matters [Line Items]
Approved amount of annual increase		29.0
Pennsylvania | Penn | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)					1.70%
Energy consumption reduction targets proposed return on equity (percent)					3.30%
Amount of requested rate increase (decrease)				56.4
Per year proposed increase to spending	2.5
Pennsylvania | WP
Regulatory Matters [Line Items]
Approved amount of annual increase		66.0
Pennsylvania | WP | PPUC
Regulatory Matters [Line Items]
Demand reduction targets proposed return on equity (percent)					1.80%
Energy consumption reduction targets proposed return on equity (percent)					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 return on equity (percent)					0.00%
Energy consumption reduction targets proposed return on equity (percent)					3.90%
Amount of requested rate increase (decrease)				$ 56.7
Per year proposed increase to spending	$ 3.3
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 | 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											1,000
Held-for-sale | Pleasants Power Station
Regulatory Matters [Line Items]
Assets held for sale											$ 195.0

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