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Utility Rate Regulation - Regulatory Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 312 | $ 320
Noncurrent regulatory assets | 2,058 | 2,060
Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 24 | 30
Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 3
Transmission Service Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 63 | 44
Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 964 | 967
Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 111 | 113
Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 19 | 20
Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 48 | 53
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 168 | 173
Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 272 | 280
Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 35 | 68
Net metering |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 160 | 147
Rate adjustment mechanism |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 100 | 95
Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 27 | 14
Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 9 | 8
Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 18 | 45
Noncurrent regulatory assets | 57 | 46
Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 96 | 96
Tax Cuts and Jobs Act (over/under) |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 38 | 21
Gas line Inspections |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 24 | 24
Advance metering Infrastructure |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 37 | 28
ISR deferral |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 7 | 22
Retired asset recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 78 | 83
PPL Electric Utilities Corp [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 90 | 133
Noncurrent regulatory assets | 703 | 673
PPL Electric Utilities Corp [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 27
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 479 | 473
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 41 | 22
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 3 | 3
PPL Electric Utilities Corp [Member] | Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 168 | 173
PPL Electric Utilities Corp [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 35 | 68
PPL Electric Utilities Corp [Member] | Net metering |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Rate adjustment mechanism |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 9 | 8
PPL Electric Utilities Corp [Member] | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 8 | 9
Noncurrent regulatory assets | 12 | 2
PPL Electric Utilities Corp [Member] | Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Tax Cuts and Jobs Act (over/under) |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 38 | 21
PPL Electric Utilities Corp [Member] | Gas line Inspections |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Advance metering Infrastructure |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | ISR deferral |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Retired asset recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 24 | 8
Noncurrent regulatory assets | 485 | 491
Louisville Gas And Electric Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 5 | 7
Louisville Gas And Electric Co [Member] | Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 3
Louisville Gas And Electric Co [Member] | Transmission Service Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 216 | 226
Louisville Gas And Electric Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 24 | 20
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 8 | 9
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 28 | 31
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 76 | 75
Louisville Gas And Electric Co [Member] | Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Net metering |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Rate adjustment mechanism |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 9 | 5
Noncurrent regulatory assets | 9 | 4
Louisville Gas And Electric Co [Member] | Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Tax Cuts and Jobs Act (over/under) |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Gas line Inspections |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 22 | 22
Louisville Gas And Electric Co [Member] | Advance metering Infrastructure |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 19 | 14
Louisville Gas And Electric Co [Member] | ISR deferral |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Retired asset recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 78 | 83
Kentucky Utilities Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 1
Noncurrent regulatory assets | 458 | 458
Kentucky Utilities Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 19 | 23
Kentucky Utilities Co [Member] | Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Transmission Service Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 148 | 149
Kentucky Utilities Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 38 | 29
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 6 | 6
Kentucky Utilities Co [Member] | Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 20 | 22
Kentucky Utilities Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 196 | 205
Kentucky Utilities Co [Member] | Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Net metering |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Rate adjustment mechanism |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 1
Noncurrent regulatory assets | 11 | 8
Kentucky Utilities Co [Member] | Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Tax Cuts and Jobs Act (over/under) |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Gas line Inspections |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 2 | 2
Kentucky Utilities Co [Member] | Advance metering Infrastructure |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 18 | 14
Kentucky Utilities Co [Member] | ISR deferral |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Retired asset recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | $ 0 | $ 0

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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