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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 30, 2020
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.
| 2020 Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,885 |  |  | $ | 586 |  |  | $ | 806 |  |  | $ | 363 |  |  | $ | 452 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (1) |  |  | (5) |  |  | 4 |  |  | 2 |  |  | 2 |
Other (c) | (5) |  |  | — |  |  | (4) |  |  | (2) |  |  | (2) |
Revenues from Contracts with Customers | $ | 1,879 |  |  | $ | 581 |  |  | $ | 806 |  |  | $ | 363 |  |  | $ | 452 |
| 2019 Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,933 |  |  | $ | 590 |  |  | $ | 844 |  |  | $ | 382 |  |  | $ | 466 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | 8 |  |  | 2 |  |  | 6 |  |  | 4 |  |  | 2 |
Other (c) | (11) |  |  | (3) |  |  | (6) |  |  | (3) |  |  | (3) |
Revenues from Contracts with Customers | $ | 1,930 |  |  | $ | 589 |  |  | $ | 844 |  |  | $ | 383 |  |  | $ | 465 |
| 2020 Nine Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 5,678 |  |  | $ | 1,748 |  |  | $ | 2,331 |  |  | $ | 1,092 |  |  | $ | 1,272 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (12) |  |  | (6) |  |  | (6) |  |  | (2) |  |  | (4) |
Other (c) | (22) |  |  | (3) |  |  | (14) |  |  | (6) |  |  | (8) |
Revenues from Contracts with Customers | $ | 5,644 |  |  | $ | 1,739 |  |  | $ | 2,311 |  |  | $ | 1,084 |  |  | $ | 1,260 |
| 2019 Nine Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 5,815 |  |  | $ | 1,756 |  |  | $ | 2,421 |  |  | $ | 1,126 |  |  | $ | 1,322 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (18) |  |  | (4) |  |  | (14) |  |  | (1) |  |  | (13) |
Other (c) | (30) |  |  | (8) |  |  | (16) |  |  | (7) |  |  | (9) |
Revenues from Contracts with Customers | $ | 5,767 |  |  | $ | 1,744 |  |  | $ | 2,391 |  |  | $ | 1,118 |  |  | $ | 1,300 |
(a)PPL includes $485 million and $1,575 million for the three and nine months ended September 30, 2020 and $491 million and $1,615 million for the three and nine months ended September 30, 2019 of revenues from external customers reported by the U.K. Regulated segment. PPL Electric and LKE represent revenues from external customers reported by the Pennsylvania Regulated and Kentucky Regulated segments. 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 for LG&E, and the generation formula rate for KU. 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.
| 2020 Three Months
| PPL (d) |  | PPL Electric (d) |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 440 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 651 |  |  | 303 |  |  | 348 |  |  | 173 |  |  | 175 |
Commercial | 310 |  |  | 79 |  |  | 231 |  |  | 112 |  |  | 119 |
Industrial | 156 |  |  | 13 |  |  | 143 |  |  | 47 |  |  | 96 |
Other (b) | 130 |  |  | 12 |  |  | 66 |  |  | 28 |  |  | 38 |
Wholesale - municipality | 7 |  |  | — |  |  | 7 |  |  | — |  |  | 7 |
Wholesale - other (c) | 11 |  |  | — |  |  | 11 |  |  | 3 |  |  | 17 |
Transmission | 174 |  |  | 174 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,879 |  |  | $ | 581 |  |  | $ | 806 |  |  | $ | 363 |  |  | $ | 452 |
| 2019 Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 454 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 708 |  |  | 352 |  |  | 356 |  |  | 177 |  |  | 179 |
Commercial | 346 |  |  | 97 |  |  | 249 |  |  | 123 |  |  | 126 |
Industrial | 164 |  |  | 16 |  |  | 148 |  |  | 47 |  |  | 101 |
Other (b) | 128 |  |  | 12 |  |  | 73 |  |  | 31 |  |  | 42 |
Wholesale - municipality | 6 |  |  | — |  |  | 6 |  |  | — |  |  | 6 |
Wholesale - other (c) | 12 |  |  | — |  |  | 12 |  |  | 5 |  |  | 11 |
Transmission | 112 |  |  | 112 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,930 |  |  | $ | 589 |  |  | $ | 844 |  |  | $ | 383 |  |  | $ | 465 |
| 2020 Nine Months
| PPL (d) |  | PPL Electric (d) |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 1,472 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 1,948 |  |  | 937 |  |  | 1,011 |  |  | 509 |  |  | 502 |
Commercial | 896 |  |  | 234 |  |  | 662 |  |  | 336 |  |  | 326 |
Industrial | 434 |  |  | 33 |  |  | 401 |  |  | 130 |  |  | 271 |
Other (b) | 354 |  |  | 38 |  |  | 194 |  |  | 84 |  |  | 110 |
Wholesale - municipality | 15 |  |  | — |  |  | 15 |  |  | — |  |  | 15 |
Wholesale - other (c) | 28 |  |  | — |  |  | 28 |  |  | 25 |  |  | 36 |
Transmission | 497 |  |  | 497 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 5,644 |  |  | $ | 1,739 |  |  | $ | 2,311 |  |  | $ | 1,084 |  |  | $ | 1,260 |
| 2019 Nine Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 1,520 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 2,058 |  |  | 1,060 |  |  | 998 |  |  | 504 |  |  | 494 |
Commercial | 967 |  |  | 279 |  |  | 688 |  |  | 352 |  |  | 336 |
Industrial | 470 |  |  | 48 |  |  | 422 |  |  | 134 |  |  | 288 |
Other (b) | 360 |  |  | 39 |  |  | 209 |  |  | 93 |  |  | 116 |
Wholesale - municipality | 38 |  |  | — |  |  | 38 |  |  | — |  |  | 38 |
Wholesale - other (c) | 36 |  |  | — |  |  | 36 |  |  | 35 |  |  | 28 |
Transmission | 318 |  |  | 318 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 5,767 |  |  | $ | 1,744 |  |  | $ | 2,391 |  |  | $ | 1,118 |  |  | $ | 1,300 |
(a)Represents customers of WPD. (b)Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses. (c)Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at LKE. (d)In the fourth quarter of 2019, management deemed it appropriate to present the revenue offset associated with network integration transmission service (NITS) as distribution revenue rather than transmission revenue.
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
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL | $ | 8 |  |  | $ | 11 |  |  | $ | 22 |  |  | $ | 22 |
PPL Electric | 3 |  |  | 8 |  |  | 12 |  |  | 14 |
LKE | 4 |  |  | 2 |  |  | 7 |  |  | 5 |
LG&E | 3 |  |  | 1 |  |  | 4 |  |  | 2 |
KU | 1 |  |  | 1 |  |  | 3 |  |  | 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 |  | LKE |  | LG&E |  | KU
Contract liabilities at December 31, 2019 | $ | 44 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities at September 30, 2020 | 40 |  |  | 18 |  |  | 9 |  |  | 5 |  |  | 4 |
Revenue recognized during the nine months ended September 30, 2020 that was included in the contract liability balance at December 31, 2019 | 28 |  |  | 9 |  |  | 9 |  |  | 5 |  |  | 4 |
Contract liabilities at December 31, 2018 | $ | 42 |  |  | $ | 23 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities at September 30, 2019 | 42 |  |  | 19 |  |  | 9 |  |  | 5 |  |  | 4 |
Revenue recognized during the nine months ended September 30, 2019 that was included in the contract liability balance at December 31, 2018 | 31 |  |  | 11 |  |  | 9 |  |  | 5 |  |  | 4 |

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