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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2018
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 June 30, 2018.
| Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,848 |  |  | $ | 517 |  |  | $ | 743 |  |  | $ | 335 |  |  | $ | 414 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | 9 |  |  | — |  |  | 9 |  |  | 6 |  |  | 3 |
Other (c) | (13 | ) |  | (2 | ) |  | (4 | ) |  | (2 | ) |  | (2 | )
Revenues from Contracts with Customers | $ | 1,844 |  |  | $ | 515 |  |  | $ | 748 |  |  | $ | 339 |  |  | $ | 415 |
| Six Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 3,974 |  |  | $ | 1,156 |  |  | $ | 1,615 |  |  | $ | 754 |  |  | $ | 885 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | 41 |  |  | 2 |  |  | 39 |  |  | 20 |  |  | 19 |
Other (c) | (28 | ) |  | (6 | ) |  | (9 | ) |  | (3 | ) |  | (6 | )
Revenues from Contracts with Customers | $ | 3,987 |  |  | $ | 1,152 |  |  | $ | 1,645 |  |  | $ | 771 |  |  | $ | 898 |
(a) | PPL includes $584 million and $1,199 million for the three and six months ended June 30, 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 3 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 tables show revenues from contracts with customers disaggregated by customer class for the periods ended June 30, 2018.
| Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 547 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 588 |  |  | 300 |  |  | 288 |  |  | 146 |  |  | 142 |
Commercial | 296 |  |  | 89 |  |  | 207 |  |  | 107 |  |  | 100 |
Industrial | 155 |  |  | 12 |  |  | 143 |  |  | 45 |  |  | 98 |
Other (b) | 114 |  |  | 13 |  |  | 67 |  |  | 30 |  |  | 37 |
Wholesale - municipal | 31 |  |  | — |  |  | 31 |  |  | — |  |  | 31 |
Wholesale - other (c) | 12 |  |  | — |  |  | 12 |  |  | 11 |  |  | 7 |
Transmission | 101 |  |  | 101 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,844 |  |  | $ | 515 |  |  | $ | 748 |  |  | $ | 339 |  |  | $ | 415 |
| Six Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 1,131 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 1,392 |  |  | 708 |  |  | 684 |  |  | 343 |  |  | 341 |
Commercial | 621 |  |  | 187 |  |  | 434 |  |  | 231 |  |  | 203 |
Industrial | 310 |  |  | 25 |  |  | 285 |  |  | 89 |  |  | 196 |
Other (b) | 220 |  |  | 26 |  |  | 135 |  |  | 61 |  |  | 74 |
Wholesale - municipal | 61 |  |  | — |  |  | 61 |  |  | — |  |  | 61 |
Wholesale - other (c) | 46 |  |  | — |  |  | 46 |  |  | 47 |  |  | 23 |
Transmission | 206 |  |  | 206 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 3,987 |  |  | $ | 1,152 |  |  | $ | 1,645 |  |  | $ | 771 |  |  | $ | 898 |
(a) | Represents customers of WPD.
(b) | Primarily includes revenues from pole attachments, street lighting and other public authorities.
(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 Contracts with Customers [Table Text Block] | The following table shows the accounts receivable balances that were impaired for the periods ended June 30, 2018.
| Three Months |  | Six Months
PPL | $ | 3 |  |  | $ | 13 |
PPL Electric | 3 |  |  | 10 |
LKE | 1 |  |  | 3 |
LG&E | — |  |  | 1 |
KU | 1 |  |  | 2 |
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 June 30, 2018 | 38 |  |  | 14 |  |  | 8 |  |  | 4 |  |  | 3 |
Contract With Customer Liability Revenue Recognized [Table Text Block] | The following table shows the revenue recognized during the period ended June 30, 2018 that was included in the contract liability balance at December 31, 2017.
| Six Months
PPL | $ | 18 |
PPL Electric | 8 |
LKE | 8 |
LG&E | 4 |
KU | 4 |

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