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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from contracts with customers [Line Items] |
Reconciliation of revenue from contracts with customers [Table Text Block] | The following table reconciles "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the years ended December 31:
| 2021
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 5,783 |  |  | $ | 2,402 |  |  | $ | 1,569 |  |  | $ | 1,826 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | 77 |  |  | 83 |  |  | (3) |  |  | (3) |
Other (c) | (22) |  |  | (3) |  |  | (8) |  |  | (9) |
Revenues from Contracts with Customers | $ | 5,838 |  |  | $ | 2,482 |  |  | $ | 1,558 |  |  | $ | 1,814 |
| 2020
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 5,474 |  |  | $ | 2,331 |  |  | $ | 1,456 |  |  | $ | 1,690 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | (24) |  |  | (12) |  |  | (8) |  |  | (4) |
Other (c) | (21) |  |  | (3) |  |  | (7) |  |  | (10) |
Revenues from Contracts with Customers | $ | 5,429 |  |  | $ | 2,316 |  |  | $ | 1,441 |  |  | $ | 1,676 |
| 2019
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 5,602 |  |  | $ | 2,358 |  |  | $ | 1,500 |  |  | $ | 1,740 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | (30) |  |  | (6) |  |  | (10) |  |  | (14) |
Other (c) | (31) |  |  | (10) |  |  | (9) |  |  | (12) |
Revenues from Contracts with Customers | $ | 5,541 |  |  | $ | 2,342 |  |  | $ | 1,481 |  |  | $ | 1,714 |
(a)Amounts for PPL Electric represent revenues from external customers reported by the Pennsylvania Regulated segment and amounts for LG&E and KU, net of intercompany power sales and transmission revenues, represent revenues from external customers reported by the Kentucky Regulated segment. See Note 2 for additional information. (b)Alternative revenue programs include the transmission formula rate for PPL Electric, the ECR and DSM programs for LG&E and KU, the GLT and GSC programs for LG&E, and the generation formula rate for KU. For PPL Electric, revenue in 2021 was reduced by $78 million for a reduction in the transmission formula rate return on equity. See Note 7 for additional information. This line item shows the over/under collection of these rate mechanisms with over-collections of revenue shown as positive amounts in the table above and under-collections shown as negative amounts. (c)Represents additional revenues outside the scope of revenues from contracts with customers such as leases and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block] | The following table shows revenues from contracts with customers disaggregated by customer class for the years ended December 31:
| 2021
| Residential |  | Commercial |  | Industrial |  | Other (a) |  | Wholesale - municipality |  | Wholesale - other (b) |  | Transmission |  | Revenues from Contracts with Customers
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PA Regulated | $ | 1,299 |  |  | $ | 350 |  |  | $ | 53 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 730 |  |  | $ | 2,482 |
KY Regulated | 1,416 |  |  | 928 |  |  | 586 |  |  | 305 |  |  | 24 |  |  | 66 |  |  | — |  |  | 3,325 |
Corp and Other | — |  |  | — |  |  | — |  |  | 31 |  |  | — |  |  | — |  |  | — |  |  | 31 |
Total PPL | $ | 2,715 |  |  | $ | 1,278 |  |  | $ | 639 |  |  | $ | 386 |  |  | $ | 24 |  |  | $ | 66 |  |  | $ | 730 |  |  | $ | 5,838 |
PPL Electric | $ | 1,299 |  |  | $ | 350 |  |  | $ | 53 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 730 |  |  | $ | 2,482 |
LG&E | $ | 711 |  |  | $ | 473 |  |  | $ | 180 |  |  | $ | 145 |  |  | $ | — |  |  | $ | 49 |  |  | $ | — |  |  | $ | 1,558 |
KU | $ | 705 |  |  | $ | 455 |  |  | $ | 406 |  |  | $ | 160 |  |  | $ | 24 |  |  | $ | 64 |  |  | $ | — |  |  | $ | 1,814 |
| 2020
| Residential |  | Commercial |  | Industrial |  | Other (a) |  | Wholesale - municipality |  | Wholesale - other (b) |  | Transmission |  | Revenues from Contracts with Customers
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PA Regulated | $ | 1,238 |  |  | $ | 314 |  |  | $ | 44 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 670 |  |  | $ | 2,316 |
KY Regulated | 1,347 |  |  | 871 |  |  | 538 |  |  | 261 |  |  | 20 |  |  | 40 |  |  | — |  |  | 3,077 |
Corp and Other | — |  |  | — |  |  | — |  |  | 36 |  |  | — |  |  | — |  |  | — |  |  | 36 |
Total PPL | $ | 2,585 |  |  | $ | 1,185 |  |  | $ | 582 |  |  | $ | 347 |  |  | $ | 20 |  |  | $ | 40 |  |  | $ | 670 |  |  | $ | 5,429 |
PPL Electric | $ | 1,238 |  |  | $ | 314 |  |  | $ | 44 |  |  | $ | 50 |  |  | $ | — |  |  | $ | — |  |  | $ | 670 |  |  | $ | 2,316 |
LG&E | $ | 676 |  |  | $ | 444 |  |  | $ | 173 |  |  | $ | 114 |  |  | $ | — |  |  | $ | 34 |  |  | $ | — |  |  | $ | 1,441 |
KU | $ | 671 |  |  | $ | 427 |  |  | $ | 365 |  |  | $ | 147 |  |  | $ | 20 |  |  | $ | 46 |  |  | $ | — |  |  | $ | 1,676 |
| 2019
| Residential |  | Commercial |  | Industrial |  | Other (a) |  | Wholesale - municipality |  | Wholesale - other (b) |  | Transmission |  | Revenues from Contracts with Customers
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PA Regulated | $ | 1,288 |  |  | $ | 349 |  |  | $ | 59 |  |  | $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 594 |  |  | $ | 2,342 |
KY Regulated | 1,322 |  |  | 908 |  |  | 562 |  |  | 277 |  |  | 43 |  |  | 49 |  |  | — |  |  | 3,161 |
Corp and Other | — |  |  | — |  |  | — |  |  | 38 |  |  | — |  |  | — |  |  | — |  |  | 38 |
Total PPL | $ | 2,610 |  |  | $ | 1,257 |  |  | $ | 621 |  |  | $ | 367 |  |  | $ | 43 |  |  | $ | 49 |  |  | $ | 594 |  |  | $ | 5,541 |
PPL Electric | $ | 1,288 |  |  | $ | 349 |  |  | $ | 59 |  |  | $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 594 |  |  | $ | 2,342 |
LG&E | $ | 668 |  |  | $ | 466 |  |  | $ | 180 |  |  | $ | 121 |  |  | $ | — |  |  | $ | 46 |  |  | $ | — |  |  | $ | 1,481 |
KU | $ | 654 |  |  | $ | 442 |  |  | $ | 382 |  |  | $ | 156 |  |  | $ | 43 |  |  | $ | 37 |  |  | $ | — |  |  | $ | 1,714 |
(a)Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses. (b)Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at PPL.
Credit loss recognized from contract with customer [Table Text Block] | The following table shows the accounts receivable and unbilled revenues balances that were impaired for the year ended December 31:
| 2021 |  | 2020 |  | 2019
PPL | $ | 22 |  |  | $ | 25 |  |  | $ | 27 |
PPL Electric | 10 |  |  | 17 |  |  | 21 |
LG&E | 4 |  |  | 4 |  |  | 2 |
KU | 8 |  |  | 4 |  |  | 4 |
Contract with Customer, Asset and Liability [Table Text Block] | The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers:
| PPL |  | PPL Electric |  | LG&E |  | KU
Contract liabilities as of December 31, 2021 | $ | 42 |  |  | $ | 25 |  |  | $ | 6 |  |  | $ | 6 |
Contract liabilities as of December 31, 2020 | 40 |  |  | 23 |  |  | 5 |  |  | 6 |
Revenue recognized during the year ended December 31, 2021 that was included in the contract liability balance at December 31, 2020 | 24 |  |  | 11 |  |  | 5 |  |  | 6 |
Contract liabilities as of December 31, 2020 | $ | 40 |  |  | $ | 23 |  |  | $ | 5 |  |  | $ | 6 |
Contract liabilities as of December 31, 2019 | 37 |  |  | 21 |  |  | 5 |  |  | 4 |
Revenue recognized during the year ended December 31, 2020 that was included in the contract liability balance at December 31, 2019 | 22 |  |  | 9 |  |  | 5 |  |  | 4 |
Contract liabilities as of December 31, 2019 | $ | 37 |  |  | $ | 21 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities as of December 31, 2018 | 40 |  |  | 23 |  |  | 5 |  |  | 4 |
Revenue recognized during the year ended December 31, 2019 that was included in the contract liability balance at December 31, 2018 | 25 |  |  | 11 |  |  | 5 |  |  | 4 |

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