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SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Condensed Unconsolidated Financial Statements [Line Items]    
2022 $ 1,374  
Aggregate maturities of long-term debt (Details) [Abstract]    
2021 950  
Principal outstanding 23,249 $ 22,002
Thereafter 15,916  
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]    
Condensed Unconsolidated Financial Statements [Line Items]    
Maximum exposure $ 200  
Term of guarantee (in years) 12 years  
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues $ 200  
LG&E and KU Energy LLC Unconsolidated [Member] | LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]    
Condensed Unconsolidated Financial Statements [Line Items]    
Term of guarantee (in years) 12 years  
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues $ 200