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Commitments and Contingencies - Environmental Matters (Details)
wood_poles in Millions, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Integer
wood_poles
pollutant
fuel_sources
Dec. 31, 2015
USD ($)
Environmental Matters - Air (Numeric) [Abstract]    
Number of criteria pollutants | pollutant 6  
Number of fuel sources no longer subject to reporting and emission allowance requirements | fuel_sources 18  
Environmental Matters - European Union Creosote Ban (Numeric) [Abstract]    
Number of poles to be replaced | wood_poles 1.4  
PPL Electric Additional Sites [Member]    
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]    
Environmental site accrual $ 10 $ 10
Potential costs for remediation and other liabilities in excess of accrual 30  
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member]    
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]    
Environmental site accrual 10 $ 10
Potential costs for remediation and other liabilities in excess of accrual $ 30  
LG And E And KU Energy LLC [Member]    
Environmental Matters - Air (Numeric) [Abstract]    
Number of criteria pollutants | Integer 6  
Louisville Gas And Electric Co [Member]    
Environmental Matters - Air (Numeric) [Abstract]    
Number of criteria pollutants | Integer 6  
Kentucky Utilities Co [Member]    
Environmental Matters - Air (Numeric) [Abstract]    
Number of criteria pollutants | Integer 6