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Commitments and Contingencies - Guarantees and Other Assurances (Details) - 9 months ended Sep. 30, 2023 £ in Millions, $ in Millions | USD ($) employee | GBP (£) | USD ($)
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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 |  |

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