Commitments and Contingencies (Environmental Matter and Other) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) employees
Other - Labor Union Agreements (Numeric) [Abstract]
Collective Bargaining Agreement Term	5 years
PPL Electric [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract]
Environmental site accrual | $	$ 10
PPL Electric Utilities Corp [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees	1,400
Collective Bargaining Agreement Term	5 years
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund And Other Remediation (Numeric) [Abstract]
Environmental site accrual | $	$ 10
LG And E And KU Energy LLC [Member] | LGE [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees	671
Collective Bargaining Agreement Term	3 years
LG And E And KU Energy LLC [Member] | KU [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees	54
Collective Bargaining Agreement Term	3 years
Louisville Gas And Electric Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees	671
Collective Bargaining Agreement Term	3 years
Kentucky Utilities Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Number Of Union Employees	54
Collective Bargaining Agreement Term	3 years