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Utility Rate Regulation - Regulatory Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Assets [Line Items] |  |
Current regulatory assets | $ 330 | $ 293
Noncurrent regulatory assets | 1,859 | 1,874
Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 36 | 38
Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 4 | 0
Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 6
Transmission Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 5
Transmission Service Charge [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 36 | 43
Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 880 | 887
Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 96 | 97
Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 22 | 22
Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 5 | 7
Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 56 | 58
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 171 | 178
Asset Retirement Obligations [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 288 | 289
Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 33 | 12
Fuel adjustment clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 12 | 4
Net metering |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 123 | 112
Rate adjustment mechanism |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 129 | 118
Derivative Instruments [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 29 | 51
Noncurrent regulatory assets | 4 | 8
Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 15 | 14
Universal Service Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 8 | 0
Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 8 | 7
Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 35 | 33
Noncurrent regulatory assets | 81 | 79
Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 97 | 99
PPL Electric Utilities Corp [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 84 | 57
Noncurrent regulatory assets | 592 | 598
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] | Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 6
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [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 | 26 | 31
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 417 | 417
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 3 | 3
PPL Electric Utilities Corp [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
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 | 171 | 178
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 | 33 | 12
PPL Electric Utilities Corp [Member] | Fuel adjustment clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
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] | Derivative Instruments [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Noncurrent 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] | Universal Service Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 8 | 0
PPL Electric Utilities Corp [Member] | Distribution System Improvement Charge |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 8 | 7
PPL Electric Utilities Corp [Member] | Other |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 3 | 1
Noncurrent regulatory assets | 1 | 0
PPL Electric Utilities Corp [Member] | Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 14 | 7
Noncurrent regulatory assets | 388 | 395
Louisville Gas And Electric Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 9 | 10
Louisville Gas And Electric Co [Member] | Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 4 | 0
Louisville Gas And Electric Co [Member] | Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Louisville Gas And Electric Co [Member] | Transmission Formula Rate [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
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 | 212 | 217
Louisville Gas And Electric Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 14 | 15
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 10 | 10
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 5 | 7
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 33 | 34
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 | 76
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] | Fuel adjustment clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 3
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] | Derivative Instruments [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Noncurrent 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] | Universal Service Rider [Member] |  |
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 | 4 | 4
Noncurrent regulatory assets | 29 | 26
Louisville Gas And Electric Co [Member] | Environmental cost recovery |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 7 | 3
Noncurrent regulatory assets | 435 | 439
Kentucky Utilities Co [Member] | Plant outage costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 27 | 28
Kentucky Utilities Co [Member] | Gas supply clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Smart Meter Rider [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Transmission Formula Rate [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 | 134 | 136
Kentucky Utilities Co [Member] | Storm Costs [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 14 | 14
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 7 | 7
Kentucky Utilities Co [Member] | Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Terminated Interest Rate Swaps [Member] |  |
Regulatory Assets [Line Items] |  |
Noncurrent regulatory assets | 23 | 24
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 | 212 | 213
Kentucky Utilities Co [Member] | Storm Damage costs[Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Fuel adjustment clause [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 6 | 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] | Derivative Instruments [Member] |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Noncurrent regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Renewable energy certificates |  |
Regulatory Assets [Line Items] |  |
Current regulatory assets | 0 | 0
Kentucky Utilities Co [Member] | Universal Service Rider [Member] |  |
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 | 1 | 3
Noncurrent regulatory assets | 18 | 17
Kentucky Utilities Co [Member] | Environmental cost 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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