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Commitments and Contingencies - Guarantees and Other Assurances (Details) - 9 months ended Sep. 30, 2023
£ in Millions, $ in Millions
USD ($)
employee
GBP (£)
USD ($)
Other Guarantee (Numeric) [Abstract]      
Maximum aggregate coverage bodily injury and property damage     $ 225
Indemnification Cap, Surrenders of Tax Losses | £   £ 50  
Indemnification for Safari sale/leaseback $ 25    
LGE [Member]      
Other Guarantee (Numeric) [Abstract]      
Collective Bargaining Agreement Term 3 years    
Concentration Risk Number Of Union Employees | employee 600    
Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] | LGE [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     61
Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] | KU [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     27
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications related to certain tax liabilities related to the sale of the U.K. utility business [Domain]      
Other Guarantee (Numeric) [Abstract]      
Maximum exposure | £   £ 50  
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Guarantee of payment obligations under certain sale/leaseback financing transactions related to the sale of Safari Holdings      
Other Guarantee (Numeric) [Abstract]      
Maximum exposure     129
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Guarantee of payment obligations under certain power purchase agreements related to the sale of Safari Holdings      
Other Guarantee (Numeric) [Abstract]      
Maximum exposure     33
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications for losses suffered related to items not covered by Aspen Power's representation and warranty insurance associated with the sale of Safari Holdings      
Other Guarantee (Numeric) [Abstract]      
Maximum exposure     140
LKE Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     88
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable.    
Louisville Gas And Electric Co [Member]      
Other Guarantee (Numeric) [Abstract]      
Collective Bargaining Agreement Term 3 years    
Concentration Risk Number Of Union Employees | employee 600    
Louisville Gas And Electric Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     61
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable    
Kentucky Utilities Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     $ 27
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable