Commitments and Contingencies - Environmental Matters and Other (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) employees	Dec. 31, 2017 USD ($)
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 | $	$ 11	$ 10
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]
Collective Bargaining Agreement Term	3 years
Number Of Union Employees | employees	68
Kentucky Utilities Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Collective Bargaining Agreement Term	3 years
Number Of Union Employees | employees	68