Commitments and Contingencies (Environmental Matter and Other) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) employees	Dec. 31, 2018 USD ($) employees	Dec. 31, 2017 USD ($)
PPL Electric [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Employees Displaced | employees	86
Separation Benefits | $	$ 6
PPL Electric [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract]
Environmental site accrual | $		$ 11	$ 10
PPL Electric Utilities Corp [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Employees Displaced | employees	86
Separation Benefits | $	$ 6
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract]
Environmental site accrual | $		$ 11	$ 10
LG And E And KU Energy LLC [Member] | KU [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees | employees		68
Collective Bargaining Agreement Term		3 years
Kentucky Utilities Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees | employees		68
Collective Bargaining Agreement Term		3 years