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Utility Rate Regulation (Regulatory Liabilities) (Details) - USD ($) $ in Millions | May 21, 2020 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | $ 182 | $ 79
Noncurrent regulatory liabilities |  | 2,422 | 2,530
Generation Supply Charge [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 10 | 21
Universal Service Rider [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 17 | 22
TCJA customer refund [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 22 | 11
Act 129 Compliance Rider [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 10 | 7
Regulatory Liability due to ROE Reserve |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 73 | 0
Economic relief billing credit |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 27 | 0
Accumulated cost of removal of utility plant [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 639 | 653
Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 35 | 43
Net deferred taxes [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 1,591 | 1,690
Defined Benefit Plans [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 95 | 60
Terminated interest rate swaps [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 62 | 66
Other Regulatory Liabilities [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 2 | 17
Noncurrent regulatory liabilities |  | 0 | 18
Transmission Service Charge [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 21 | 1
PPL Electric Utilities Corp [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 153 | 68
Noncurrent regulatory liabilities |  | 559 | 578
Return on equity | 11.18% |  |
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 10 | 21
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 17 | 22
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 22 | 11
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 10 | 7
PPL Electric Utilities Corp [Member] | Regulatory Liability due to ROE Reserve |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 73 | 0
PPL Electric Utilities Corp [Member] | Economic relief billing credit |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 0
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 |  | 531 | 560
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 28 | 18
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 |  | 0 | 6
Noncurrent regulatory liabilities |  | 0 | 0
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 21 | 1
Louisville Gas And Electric Co [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 21 | 0
Noncurrent regulatory liabilities |  | 818 | 882
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 0
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 0
Louisville Gas And Electric Co [Member] | Economic relief billing credit |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 21 | 0
Louisville Gas And Electric Co [Member] | Accumulated cost of removal of utility plant [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 262 | 274
Louisville Gas And Electric Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 24 | 30
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 491 | 528
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 10 | 0
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 31 | 33
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 0
Noncurrent regulatory liabilities |  | 0 | 17
Kentucky Utilities Co [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 8 | 11
Noncurrent regulatory liabilities |  | 1,045 | 1,070
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 4
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 0 | 5
Kentucky Utilities Co [Member] | Economic relief billing credit |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 6 | 0
Kentucky Utilities Co [Member] | Accumulated cost of removal of utility plant [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 377 | 379
Kentucky Utilities Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 11 | 13
Kentucky Utilities Co [Member] | Net deferred taxes [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 569 | 602
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 57 | 42
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Noncurrent regulatory liabilities |  | 31 | 33
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Current regulatory liabilities |  | 2 | 2
Noncurrent regulatory liabilities |  | $ 0 | $ 1

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