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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | $ 2,304 | $ 2,415 |  |
Alternative Revenue Programs | 7 | 36 |  |
Other Revenue | (8) | (4) |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 2,303 | 2,447 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 42 | 21 |  |
Contract with Customer, Liability | 30 | 46 | $ 43 | $ 34
Contract with Customer, Liability, Revenue Recognized | 25 | 17 |  |
Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 1,130 | 1,209 |  |
Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 451 | 503 |  |
Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 177 | 193 |  |
Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 272 | 287 |  |
Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 6 | 7 |  |
Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 15 | 11 |  |
Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 252 | 237 |  |
Pennsylvania Regulated [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 770 | 891 |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 762 | 890 |  |
Pennsylvania Regulated [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 426 | 537 |  |
Pennsylvania Regulated [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 106 | 128 |  |
Pennsylvania Regulated [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 12 | 20 |  |
Pennsylvania Regulated [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 13 | 13 |  |
Pennsylvania Regulated [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Pennsylvania Regulated [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Pennsylvania Regulated [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 205 | 192 |  |
Kentucky Regulated [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 984 | 960 |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 989 | 959 |  |
Kentucky Regulated [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 443 | 443 |  |
Kentucky Regulated [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 267 | 274 |  |
Kentucky Regulated [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 161 | 164 |  |
Kentucky Regulated [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 97 | 60 |  |
Kentucky Regulated [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 6 | 7 |  |
Kentucky Regulated [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 15 | 11 |  |
Kentucky Regulated [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 1 | (1) |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 1 | (1) |  |
Corporate and Other [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 1 | (1) |  |
Corporate and Other [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Corporate and Other [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Rhode Island Regulated |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 549 | 565 |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 551 | 599 |  |
Rhode Island Regulated | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 261 | 229 |  |
Rhode Island Regulated | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 78 | 101 |  |
Rhode Island Regulated | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 4 | 9 |  |
Rhode Island Regulated | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 161 | 215 |  |
Rhode Island Regulated | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Rhode Island Regulated | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Rhode Island Regulated | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 47 | 45 |  |
PPL Electric Utilities Corp [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 770 | 891 |  |
Alternative Revenue Programs | (3) | 1 |  |
Other Revenue | (5) | (2) |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 762 | 890 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 28 | 10 |  |
Contract with Customer, Liability | 20 | 35 | 29 | 23
Contract with Customer, Liability, Revenue Recognized | 11 | 6 |  |
PPL Electric Utilities Corp [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 426 | 537 |  |
PPL Electric Utilities Corp [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 106 | 128 |  |
PPL Electric Utilities Corp [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 12 | 20 |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 13 | 13 |  |
PPL Electric Utilities Corp [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
PPL Electric Utilities Corp [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
PPL Electric Utilities Corp [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 205 | 192 |  |
Louisville Gas And Electric Co [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 476 | 474 |  |
Alternative Revenue Programs | 2 | 1 |  |
Other Revenue | (1) | (1) |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 477 | 474 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 1 | 1 |  |
Contract with Customer, Liability | 5 | 5 | 6 | 5
Contract with Customer, Liability, Revenue Recognized | 6 | 5 |  |
Louisville Gas And Electric Co [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 218 | 241 |  |
Louisville Gas And Electric Co [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 138 | 152 |  |
Louisville Gas And Electric Co [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 47 | 49 |  |
Louisville Gas And Electric Co [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 52 | 16 |  |
Louisville Gas And Electric Co [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Louisville Gas And Electric Co [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 22 | 16 |  |
Louisville Gas And Electric Co [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 0 | 0 |  |
Kentucky Utilities Co [Member] |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |
Operating Revenues | 525 | 499 |  |
Alternative Revenue Programs | 5 | 0 |  |
Other Revenue | (1) | (1) |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 529 | 498 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 1 | 0 |  |
Contract with Customer, Liability | 5 | 5 | $ 7 | $ 6
Contract with Customer, Liability, Revenue Recognized | 7 | 6 |  |
Kentucky Utilities Co [Member] | Residential [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 225 | 202 |  |
Kentucky Utilities Co [Member] | Commercial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 129 | 123 |  |
Kentucky Utilities Co [Member] | Industrial [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 114 | 115 |  |
Kentucky Utilities Co [Member] | Other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 46 | 44 |  |
Kentucky Utilities Co [Member] | Wholesale - municipal [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 6 | 7 |  |
Kentucky Utilities Co [Member] | Wholesale - other [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | 9 | 7 |  |
Kentucky Utilities Co [Member] | Transmission [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues from Contracts with Customers | $ 0 | $ 0 |  |

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