Acquisitions, Development and Divestitures - Development (Details) - Northeast Pocono Reliability Project [Member] $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) kV Substation mi
Development Projects [Line Items]
Total length of the expansion project (in miles) | mi	58
Capacity of a transmission line (in kilovolts) | kV	230
Substations included in request | Substation	3
Adder to the return on equity incentive denied in ratemaking request (in basis points)	100
Project costs capitalized | $	$ 350
PPL Electric Utilities Corp [Member]
Development Projects [Line Items]
Total length of the expansion project (in miles) | mi	58
Capacity of a transmission line (in kilovolts) | kV	230
Substations included in request | Substation	3
Adder to the return on equity incentive denied in ratemaking request (in basis points)	100
Project costs capitalized | $	$ 350