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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2018
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 year ended December 31:
| 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) | PPL includes $2.3 billion for the year ended December 31, 2018 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 for PPL Electric include the over/under-collection of its transmission formula rate. Alternative revenue programs for LKE, LG&E and KU include the over/under collection for the ECR and DSM programs as well as LG&E's over/under collection of its GLT program and KU's over/under collection of its generation formula rate. Over-collections of revenue are shown as positive amounts in the table above; under-collections are 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 year ended December 31:
| 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.
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:
| 2018
PPL | $ | 34 |
PPL Electric | 24 |
LKE | 9 |
LG&E | 4 |
KU | 5 |
Contract with Customer, Asset and Liability [Table Text Block] | The following table shows the balances of contract liabilities resulting from contracts with customers.
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Contract liabilities as of December 31, 2017 | $ | 29 |  |  | $ | 19 |  |  | $ | 8 |  |  | $ | 4 |  |  | $ | 4 |
Contract liabilities as of December 31, 2018 | 42 |  |  | 23 |  |  | 9 |  |  | 5 |  |  | 4 |
Contract With Customer Liability Revenue Recognized [Table Text Block] | The following table shows the revenue recognized in 2018 that was included in the contract liability balance at the beginning of the year.
| 2018
PPL | $ | 21 |
PPL Electric | 8 |
LKE | 8 |
LG&E | 4 |
KU | 4 |

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