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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contracts with Customers [Line Items] |
Reconciliation of Revenue from Contracts with Customers [Table Text Block] | The following tables reconcile "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the periods ended September 30.
| 2021 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,512 |  |  | $ | 627 |  |  | $ | 395 |  |  | $ | 494 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | 19 |  |  | 22 |  |  | (1) |  |  | (2) |
Other (c) | (4) |  |  | — |  |  | (2) |  |  | (2) |
Revenues from Contracts with Customers | $ | 1,527 |  |  | $ | 649 |  |  | $ | 392 |  |  | $ | 490 |
| 2020 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,400 |  |  | $ | 586 |  |  | $ | 363 |  |  | $ | 452 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | (1) |  |  | (5) |  |  | 2 |  |  | 2 |
Other (c) | (4) |  |  | — |  |  | (2) |  |  | (2) |
Revenues from Contracts with Customers | $ | 1,395 |  |  | $ | 581 |  |  | $ | 363 |  |  | $ | 452 |
| 2021 Nine Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 4,298 |  |  | $ | 1,769 |  |  | $ | 1,165 |  |  | $ | 1,374 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | 62 |  |  | 68 |  |  | (2) |  |  | (4) |
Other (c) | (15) |  |  | — |  |  | (7) |  |  | (8) |
Revenues from Contracts with Customers | $ | 4,345 |  |  | $ | 1,837 |  |  | $ | 1,156 |  |  | $ | 1,362 |
| 2020 Nine Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Operating Revenues (a) | $ | 4,103 |  |  | $ | 1,748 |  |  | $ | 1,092 |  |  | $ | 1,272 |
Revenues derived from: |  |  |  |  |  |  |
Alternative revenue programs (b) | (12) |  |  | (6) |  |  | (2) |  |  | (4) |
Other (c) | (17) |  |  | (3) |  |  | (6) |  |  | (8) |
Revenues from Contracts with Customers | $ | 4,074 |  |  | $ | 1,739 |  |  | $ | 1,084 |  |  | $ | 1,260 |
(a)PPL Electric represents revenues from external customers reported by the Pennsylvania Regulated segment and LG&E and KU, net of intercompany power sales and transmission revenues, represent revenues from external customers reported by the Kentucky Regulated segment. Kentucky Regulated segment revenues from contracts with customers were $872 million and $2,484 million for the three and nine month periods ended September 30, 2021 and $806 million and $2,311 million for the three and nine month periods ended September 30, 2020. See Note 3 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 program and gas supply clause incentive mechanism for LG&E, and the generation formula rate for KU. For PPL Electric, the three months and nine months ended September 30, 2021 include a $13 million and $64 million reserve recorded 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 lease and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block] | The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended September 30.
| 2021 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 684 |  |  | $ | 324 |  |  | $ | 180 |  |  | $ | 180 |
Commercial | 345 |  |  | 95 |  |  | 123 |  |  | 127 |
Industrial | 168 |  |  | 14 |  |  | 46 |  |  | 108 |
Other (a) | 100 |  |  | 13 |  |  | 37 |  |  | 44 |
Wholesale - municipality | 7 |  |  | — |  |  | — |  |  | 7 |
Wholesale - other (b) | 20 |  |  | — |  |  | 6 |  |  | 24 |
Transmission | 203 |  |  | 203 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,527 |  |  | $ | 649 |  |  | $ | 392 |  |  | $ | 490 |
| 2020 Three Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 651 |  |  | $ | 303 |  |  | $ | 173 |  |  | $ | 175 |
Commercial | 310 |  |  | 79 |  |  | 112 |  |  | 119 |
Industrial | 156 |  |  | 13 |  |  | 47 |  |  | 96 |
Other (a) | 86 |  |  | 12 |  |  | 28 |  |  | 38 |
Wholesale - municipality | 7 |  |  | — |  |  | — |  |  | 7 |
Wholesale - other (b) | 11 |  |  | — |  |  | 3 |  |  | 17 |
Transmission | 174 |  |  | 174 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,395 |  |  | $ | 581 |  |  | $ | 363 |  |  | $ | 452 |
| 2021 Nine Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 2,025 |  |  | $ | 964 |  |  | $ | 529 |  |  | $ | 532 |
Commercial | 955 |  |  | 260 |  |  | 351 |  |  | 344 |
Industrial | 474 |  |  | 39 |  |  | 135 |  |  | 300 |
Other (a) | 284 |  |  | 38 |  |  | 102 |  |  | 120 |
Wholesale - municipality | 18 |  |  | — |  |  | — |  |  | 18 |
Wholesale - other (b) | 53 |  |  | — |  |  | 39 |  |  | 48 |
Transmission | 536 |  |  | 536 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 4,345 |  |  | $ | 1,837 |  |  | $ | 1,156 |  |  | $ | 1,362 |
| 2020 Nine Months
| PPL |  | PPL Electric |  | LG&E |  | KU
Residential | $ | 1,948 |  |  | $ | 937 |  |  | $ | 509 |  |  | $ | 502 |
Commercial | 896 |  |  | 234 |  |  | 336 |  |  | 326 |
Industrial | 434 |  |  | 33 |  |  | 130 |  |  | 271 |
Other (a) | 256 |  |  | 38 |  |  | 84 |  |  | 110 |
Wholesale - municipality | 15 |  |  | — |  |  | — |  |  | 15 |
Wholesale - other (b) | 28 |  |  | — |  |  | 25 |  |  | 36 |
Transmission | 497 |  |  | 497 |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 4,074 |  |  | $ | 1,739 |  |  | $ | 1,084 |  |  | $ | 1,260 |
(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 the Kentucky Regulated segment.
Credit Loss Recognized from Contracts with Customers [Table Text Block] | The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended September 30.
| Three Months |  | Nine Months
| 2021 |  | 2020 |  | 2021 |  | 2020
PPL | $ | 7 |  |  | $ | 7 |  |  | $ | 9 |  |  | $ | 19 |
PPL Electric | 3 |  |  | 3 |  |  | 4 |  |  | 12 |
LG&E | 1 |  |  | 3 |  |  | 1 |  |  | 4 |
KU | 3 |  |  | 1 |  |  | 4 |  |  | 3 |
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 at December 31, 2020 | $ | 40 |  |  | $ | 23 |  |  | $ | 5 |  |  | $ | 6 |
Contract liabilities at September 30, 2021 | 37 |  |  | 21 |  |  | 6 |  |  | 6 |
Revenue recognized during the nine months ended September 30, 2021 that was included in the contract liability balance at December 31, 2020 | 24 |  |  | 11 |  |  | 5 |  |  | 6 |
Contract liabilities at December 31, 2019 | $ | 37 |  |  | $ | 21 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities at September 30, 2020 | 32 |  |  | 18 |  |  | 5 |  |  | 4 |
Revenue recognized during the nine months ended September 30, 2020 that was included in the contract liability balance at December 31, 2019 | 21 |  |  | 9 |  |  | 5 |  |  | 4 |

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