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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