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Utility Rate Regulation (Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 225 | $ 238
Noncurrent regulatory liabilities | 3,340 | 3,412
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 51 | 37
Gas Supply Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 0
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 21 | 12
TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 15
Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 14
Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 996 | 950
Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 19 | 26
Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,977 | 2,094
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 252 | 187
Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 57 | 60
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 23 | 27
Noncurrent regulatory liabilities | 34 | 63
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 14
Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 72 | 96
Energy efficiency |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 23 | 23
Noncurrent regulatory liabilities | 5 | 32
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 91 | 85
Noncurrent regulatory liabilities | 836 | 820
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 51 | 37
PPL Electric Utilities Corp [Member] | Gas Supply Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 18 | 12
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 15
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 14
PPL Electric Utilities Corp [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 763 | 775
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 73 | 45
PPL Electric Utilities Corp [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 0
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 7
PPL Electric Utilities Corp [Member] | Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Energy efficiency |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 7
Noncurrent regulatory liabilities | 827 | 833
Louisville Gas And Electric Co [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 0
Louisville Gas And Electric Co [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 306 | 287
Louisville Gas And Electric Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 13 | 18
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 459 | 477
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 20 | 21
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 29 | 30
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 7
Noncurrent regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Energy efficiency |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 6
Noncurrent regulatory liabilities | 1,018 | 1,029
Kentucky Utilities Co [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Gas Supply Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 399 | 389
Kentucky Utilities Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 6 | 8
Kentucky Utilities Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 523 | 546
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 59 | 56
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 28 | 30
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 6
Noncurrent regulatory liabilities | 3 | 0
Kentucky Utilities Co [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Energy efficiency |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | $ 0 | $ 0

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