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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
| 2019
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 7,769 |  |  | $ | 2,358 |  |  | $ | 3,206 |  |  | $ | 1,500 |  |  | $ | 1,740 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (30 | ) |  | (6 | ) |  | (24 | ) |  | (10 | ) |  | (14 | )
Other (c) | (38 | ) |  | (10 | ) |  | (21 | ) |  | (9 | ) |  | (12 | )
Revenues from Contracts with Customers | $ | 7,701 |  |  | $ | 2,342 |  |  | $ | 3,161 |  |  | $ | 1,481 |  |  | $ | 1,714 |
| 2018
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 7,785 |  |  | $ | 2,277 |  |  | $ | 3,214 |  |  | $ | 1,496 |  |  | $ | 1,760 |
Revenues derived from: |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | 32 |  |  | (6 | ) |  | 38 |  |  | 12 |  |  | 26 |
Other (c) | (38 | ) |  | (12 | ) |  | (17 | ) |  | (5 | ) |  | (12 | )
Revenues from Contracts with Customers | $ | 7,779 |  |  | $ | 2,259 |  |  | $ | 3,235 |  |  | $ | 1,503 |  |  | $ | 1,774 |
(a) | For the years ended December 31, 2019 and 2018, PPL includes $2.2 billion and $2.3 billion 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 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 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 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:
| 2019
| PPL (d) |  | PPL Electric (d) |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 2,032 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 2,610 |  |  | 1,288 |  |  | 1,322 |  |  | 668 |  |  | 654 |
Commercial | 1,257 |  |  | 349 |  |  | 908 |  |  | 466 |  |  | 442 |
Industrial | 621 |  |  | 59 |  |  | 562 |  |  | 180 |  |  | 382 |
Other (b) | 495 |  |  | 52 |  |  | 277 |  |  | 121 |  |  | 156 |
Wholesale - municipal | 43 |  |  | — |  |  | 43 |  |  | — |  |  | 43 |
Wholesale - other (c) | 49 |  |  | — |  |  | 49 |  |  | 46 |  |  | 37 |
Transmission | 594 |  |  | 594 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 7,701 |  |  | $ | 2,342 |  |  | $ | 3,161 |  |  | $ | 1,481 |  |  | $ | 1,714 |
| 2018
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 2,127 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 2,704 |  |  | 1,379 |  |  | 1,325 |  |  | 666 |  |  | 659 |
Commercial | 1,233 |  |  | 368 |  |  | 865 |  |  | 455 |  |  | 410 |
Industrial | 624 |  |  | 54 |  |  | 570 |  |  | 180 |  |  | 390 |
Other (b) | 489 |  |  | 53 |  |  | 278 |  |  | 129 |  |  | 149 |
Wholesale - municipal | 118 |  |  | — |  |  | 118 |  |  | — |  |  | 118 |
Wholesale - other (c) | 79 |  |  | — |  |  | 79 |  |  | 73 |  |  | 48 |
Transmission | 405 |  |  | 405 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 7,779 |  |  | $ | 2,259 |  |  | $ | 3,235 |  |  | $ | 1,503 |  |  | $ | 1,774 |
(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 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 contract with customer [Table Text Block] | The following table shows the accounts receivable balances from contracts with customers that were impaired for the year ended December 31:
| 2019 |  | 2018
PPL | $ | 27 |  |  | $ | 34 |
PPL Electric | 21 |  |  | 24 |
LKE | 6 |  |  | 9 |
LG&E | 2 |  |  | 4 |
KU | 4 |  |  | 5 |
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 as of December 31, 2019 | $ | 44 |  |  | $ | 21 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities as of December 31, 2018 | 42 |  |  | 23 |  |  | 9 |  |  | 5 |  |  | 4 |
Revenue recognized during the year ended December 31, 2019 that was included in the contract liability balance at December 31, 2018 | 32 |  |  | 11 |  |  | 9 |  |  | 5 |  |  | 4 |
Contract liabilities as of December 31, 2018 | $ | 42 |  |  | $ | 23 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities as of December 31, 2017 | 29 |  |  | 19 |  |  | 8 |  |  | 4 |  |  | 4 |
Revenue recognized during the year ended December 31, 2018 that was included in the contract liability balance at December 31, 2017 | 21 |  |  | 8 |  |  | 8 |  |  | 4 |  |  | 4 |

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