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v3.21.2

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2022 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | $ 1,512 | $ 1,400 | $ 4,298 | $ 4,103 |  |  |
Alternative Revenue Programs | 19 | (1) | 62 | (12) |  |  |
Other Revenue | (4) | (4) | (15) | (17) |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 1,527 | 1,395 | 4,345 | 4,074 |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 7 | 7 | 9 | 19 |  |  |
Contract with Customer, Liability | 37 | 32 | 37 | 32 |  | $ 40 | $ 37
Contract with Customer, Liability, Revenue Recognized |  |  | 24 | 21 |  |  |
Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 684 | 651 | 2,025 | 1,948 |  |  |
Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 345 | 310 | 955 | 896 |  |  |
Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 168 | 156 | 474 | 434 |  |  |
Other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 100 | 86 | 284 | 256 |  |  |
Wholesale - municipal [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 7 | 7 | 18 | 15 |  |  |
Wholesale - other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 20 | 11 | 53 | 28 |  |  |
Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 203 | 174 | 536 | 497 |  |  |
PPL Electric [Member] |  |  |  |  |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |
Revenue Reserve for ROE Challenge | 13 |  | 64 |  |  |  |
Pennsylvania Regulated [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 627 | 586 | 1,769 | 1,748 |  |  |
Kentucky Regulated [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 879 | 806 | 2,505 | 2,331 |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 872 | 806 | 2,484 | 2,311 |  |  |
Corporate and Other [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 6 | 8 | 24 | 24 |  |  |
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-30 |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount | 48 |  | 48 |  |  |  |
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-30 |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Amount |  |  |  |  | $ 42 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  |  |  | 12 months |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 627 | 586 | 1,769 | 1,748 |  |  |
Alternative Revenue Programs | 22 | (5) | 68 | (6) |  |  |
Other Revenue | 0 | 0 | 0 | (3) |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 649 | 581 | 1,837 | 1,739 |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 3 | 3 | 4 | 12 |  |  |
Contract with Customer, Liability | 21 | 18 | 21 | 18 |  | 23 | 21
Contract with Customer, Liability, Revenue Recognized |  |  | 11 | 9 |  |  |
Revenue Reserve for ROE Challenge | 13 |  | 64 |  |  |  |
PPL Electric Utilities Corp [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 324 | 303 | 964 | 937 |  |  |
PPL Electric Utilities Corp [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 95 | 79 | 260 | 234 |  |  |
PPL Electric Utilities Corp [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 14 | 13 | 39 | 33 |  |  |
PPL Electric Utilities Corp [Member] | Other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 13 | 12 | 38 | 38 |  |  |
PPL Electric Utilities Corp [Member] | Wholesale - municipal [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0 | 0 |  |  |
PPL Electric Utilities Corp [Member] | Wholesale - other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0 | 0 |  |  |
PPL Electric Utilities Corp [Member] | Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 203 | 174 | 536 | 497 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 395 | 363 | 1,165 | 1,092 |  |  |
Alternative Revenue Programs | (1) | 2 | (2) | (2) |  |  |
Other Revenue | (2) | (2) | (7) | (6) |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 392 | 363 | 1,156 | 1,084 |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 1 | 3 | 1 | 4 |  |  |
Contract with Customer, Liability | 6 | 5 | 6 | 5 |  | 5 | 5
Contract with Customer, Liability, Revenue Recognized |  |  | 5 | 5 |  |  |
Louisville Gas And Electric Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 180 | 173 | 529 | 509 |  |  |
Louisville Gas And Electric Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 123 | 112 | 351 | 336 |  |  |
Louisville Gas And Electric Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 46 | 47 | 135 | 130 |  |  |
Louisville Gas And Electric Co [Member] | Other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 37 | 28 | 102 | 84 |  |  |
Louisville Gas And Electric Co [Member] | Wholesale - municipal [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0 | 0 |  |  |
Louisville Gas And Electric Co [Member] | Wholesale - other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 6 | 3 | 39 | 25 |  |  |
Louisville Gas And Electric Co [Member] | Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 0 | 0 | 0 | 0 |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |
Reconciliation of Revenue from Contracts with Customers [Abstract] |  |  |  |  |  |  |
Operating Revenues | 494 | 452 | 1,374 | 1,272 |  |  |
Alternative Revenue Programs | (2) | 2 | (4) | (4) |  |  |
Other Revenue | (2) | (2) | (8) | (8) |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 490 | 452 | 1,362 | 1,260 |  |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | 3 | 1 | 4 | 3 |  |  |
Contract with Customer, Liability | 6 | 4 | 6 | 4 |  | $ 6 | $ 4
Contract with Customer, Liability, Revenue Recognized |  |  | 6 | 4 |  |  |
Kentucky Utilities Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 180 | 175 | 532 | 502 |  |  |
Kentucky Utilities Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 127 | 119 | 344 | 326 |  |  |
Kentucky Utilities Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 108 | 96 | 300 | 271 |  |  |
Kentucky Utilities Co [Member] | Other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 44 | 38 | 120 | 110 |  |  |
Kentucky Utilities Co [Member] | Wholesale - municipal [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 7 | 7 | 18 | 15 |  |  |
Kentucky Utilities Co [Member] | Wholesale - other [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | 24 | 17 | 48 | 36 |  |  |
Kentucky Utilities Co [Member] | Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |
Revenues from Contracts with Customers | $ 0 | $ 0 | $ 0 | $ 0 |  |  |

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