Commitments and Contingencies - Environmental Matters and Other (Details) $ in Millions	1 Months Ended
	Aug. 31, 2017 employees	Mar. 31, 2017 employees	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Other - Labor Union Agreements (Numeric) [Abstract]
Collective Bargaining Agreement Term		5 years
Number Of Union Employees		1,400
PPL Electric [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Environmental site accrual | $			$ 10	$ 10
PPL Electric Utilities Corp [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Collective Bargaining Agreement Term		5 years
Number Of Union Employees		1,400
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Environmental site accrual | $			$ 10	$ 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	53
Collective Bargaining Expiration Date	2020-08
Kentucky Utilities Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Collective Bargaining Agreement Term	3 years
Number Of Union Employees	53
Collective Bargaining Expiration Date	2020-08