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Commitments and Contingencies - Guarantees and Other Assurances (Details) - 3 months ended Mar. 31, 2024
£ in Millions, $ in Millions
USD ($)
GBP (£)
USD ($)
Other Guarantee (Numeric) [Abstract]      
Maximum aggregate coverage bodily injury and property damage     $ 231
Indemnification Cap, Surrenders of Tax Losses | £   £ 50  
Indemnification for Safari sale/leaseback $ 25    
Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] | LGE [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     60
Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member] | KU [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     26
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     121
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     86
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] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]      
Guarantor Obligations [Line Items]      
Recorded liability for all guarantees     60
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     $ 26
Maximum exposure is not estimable The maximum exposure and the expiration date of these potential obligations are not presently determinable