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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details)
$ in Millions
12 Months Ended
Nov. 30, 2018
USD ($)
Oct. 29, 2018
USD ($)
Dec. 31, 2018
USD ($)
resident
claim
mi
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
coal-fired_unit
Claim By Former Affiliate [Abstract]            
Restructuring And Related Activities Ownership Percentage By Riverstone   35.00%        
Amount Of Alleged Improper Distribution   $ 733        
Amount of special cash dividend $ 500          
LKE [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Expiration date of the power purchase agreement with OVEC     Jun. 30, 2040      
LKE [Member] | Power Purchase [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
2019     $ 27      
2020     26      
2021     27      
2022     27      
2023     27      
Thereafter     430      
Total future obligation     564      
Purchases     $ 20 $ 20 $ 23  
LGE [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of residents that filed class action suit | resident     6      
Number of miles within plant that would include a class of residents | mi     4      
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1      
Generating units retired at the Cane Run plant | coal-fired_unit           3
LGE [Member] | Minimum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     1      
LGE [Member] | Maximum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     3      
LGE and KU [Member] | Natural Gas Fuel Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
LGE and KU [Member] | Natural Gas Retail Supply Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
LGE and KU [Member] | Coal [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2023      
LGE and KU [Member] | Coal Transportation And Fleeting Services [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2027      
LGE and KU [Member] | Natural Gas Transportation [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2026      
LG And E And KU Energy LLC [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Expiration date of the power purchase agreement with OVEC     Jun. 30, 2040      
LG And E And KU Energy LLC [Member] | Power Purchase [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
2019     $ 27      
2020     26      
2021     27      
2022     27      
2023     27      
Thereafter     430      
Total future obligation     564      
Purchases     $ 20 20 23  
LG And E And KU Energy LLC [Member] | LGE [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of residents that filed class action suit | resident     6      
Number of miles within plant that would include a class of residents | mi     4      
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1      
Generating units retired at the Cane Run plant | coal-fired_unit           3
LG And E And KU Energy LLC [Member] | LGE [Member] | Minimum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     1      
LG And E And KU Energy LLC [Member] | LGE [Member] | Maximum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     3      
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Fuel Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Retail Supply Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Coal [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2023      
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Coal Transportation And Fleeting Services [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2027      
LG And E And KU Energy LLC [Member] | LGE and KU [Member] | Natural Gas Transportation [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2026      
Louisville Gas And Electric Co [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Expiration date of the power purchase agreement with OVEC     Jun. 30, 2040      
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of residents that filed class action suit | resident     6      
Number of miles within plant that would include a class of residents | mi     4      
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim     1      
Generating units retired at the Cane Run plant | coal-fired_unit           3
Louisville Gas And Electric Co [Member] | Minimum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     1      
Louisville Gas And Electric Co [Member] | Maximum [Member]            
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]            
Number of miles within plant that would include a class of residents | mi     3      
Louisville Gas And Electric Co [Member] | Power Purchase [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
2019     $ 19      
2020     18      
2021     19      
2022     19      
2023     19      
Thereafter     297      
Total future obligation     391      
Purchases     $ 14 14 16  
Louisville Gas And Electric Co [Member] | Natural Gas Fuel Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
Louisville Gas And Electric Co [Member] | Natural Gas Retail Supply Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
Louisville Gas And Electric Co [Member] | Coal [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2023      
Louisville Gas And Electric Co [Member] | Coal Transportation And Fleeting Services [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2027      
Louisville Gas And Electric Co [Member] | Natural Gas Transportation [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2026      
Kentucky Utilities Co [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Expiration date of the power purchase agreement with OVEC     Jun. 30, 2040      
Kentucky Utilities Co [Member] | Power Purchase [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
2019     $ 8      
2020     8      
2021     8      
2022     8      
2023     8      
Thereafter     133      
Total future obligation     173      
Purchases     $ 6 $ 6 $ 7  
Kentucky Utilities Co [Member] | Natural Gas Fuel Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
Kentucky Utilities Co [Member] | Natural Gas Retail Supply Purchase Contracts [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2020      
Kentucky Utilities Co [Member] | Coal [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2023      
Kentucky Utilities Co [Member] | Coal Transportation And Fleeting Services [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2027      
Kentucky Utilities Co [Member] | Natural Gas Transportation [Member]            
Energy Purchase Commitments (Numeric) [Abstract]            
Maximum maturity date     2026