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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2019
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.
| 2019 Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 1,803 |  |  | $ | 521 |  |  | $ | 732 |  |  | $ | 334 |  |  | $ | 406 |
Revenues derived from: |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (20 | ) |  | (2 | ) |  | (18 | ) |  | (3 | ) |  | (15 | )
Other (c) | (10 | ) |  | (2 | ) |  | (6 | ) |  | (3 | ) |  | (3 | )
Revenues from Contracts with Customers | $ | 1,773 |  |  | $ | 517 |  |  | $ | 708 |  |  | $ | 328 |  |  | $ | 388 |
| 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 |
| 2019 Six Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Operating Revenues (a) | $ | 3,882 |  |  | $ | 1,166 |  |  | $ | 1,577 |  |  | $ | 744 |  |  | $ | 856 |
Revenues derived from: |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative revenue programs (b) | (26 | ) |  | (6 | ) |  | (20 | ) |  | (5 | ) |  | (15 | )
Other (c) | (19 | ) |  | (5 | ) |  | (10 | ) |  | (4 | ) |  | (6 | )
Revenues from Contracts with Customers | $ | 3,837 |  |  | $ | 1,155 |  |  | $ | 1,547 |  |  | $ | 735 |  |  | $ | 835 |
| 2018 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 $541 million and $1,124 million for the three and six months ended June 30, 2019 and $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 include the transmission formula rate for PPL Electric, the ECR and DSM programs for LKE, 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 tables show revenues from contracts with customers disaggregated by customer class for the periods ended June 30.
| 2019 Three Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 510 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 572 |  |  | 301 |  |  | 271 |  |  | 138 |  |  | 133 |
Commercial | 302 |  |  | 87 |  |  | 215 |  |  | 108 |  |  | 107 |
Industrial | 156 |  |  | 15 |  |  | 141 |  |  | 43 |  |  | 98 |
Other (b) | 117 |  |  | 13 |  |  | 66 |  |  | 29 |  |  | 37 |
Wholesale - municipal | 4 |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Wholesale - other (c) | 11 |  |  | — |  |  | 11 |  |  | 10 |  |  | 9 |
Transmission | 101 |  |  | 101 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 1,773 |  |  | $ | 517 |  |  | $ | 708 |  |  | $ | 328 |  |  | $ | 388 |
| 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 |
| 2019 Six Months
| PPL |  | PPL Electric |  | LKE |  | LG&E |  | KU
Licensed energy suppliers (a) | $ | 1,066 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Residential | 1,350 |  |  | 708 |  |  | 642 |  |  | 327 |  |  | 315 |
Commercial | 621 |  |  | 182 |  |  | 439 |  |  | 229 |  |  | 210 |
Industrial | 306 |  |  | 32 |  |  | 274 |  |  | 87 |  |  | 187 |
Other (b) | 232 |  |  | 27 |  |  | 136 |  |  | 62 |  |  | 74 |
Wholesale - municipal | 32 |  |  | — |  |  | 32 |  |  | — |  |  | 32 |
Wholesale - other (c) | 24 |  |  | — |  |  | 24 |  |  | 30 |  |  | 17 |
Transmission | 206 |  |  | 206 |  |  | — |  |  | — |  |  | — |
Revenues from Contracts with Customers | $ | 3,837 |  |  | $ | 1,155 |  |  | $ | 1,547 |  |  | $ | 735 |  |  | $ | 835 |
| 2018 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, 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 Contracts with Customers [Table Text Block] | The following table shows the accounts receivable balances that were impaired for the periods ended June 30.
| Three Months |  | Six Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL | $ | 2 |  |  | $ | 3 |  |  | $ | 11 |  |  | $ | 13 |
PPL Electric | — |  |  | 3 |  |  | 6 |  |  | 10 |
LKE | 1 |  |  | 1 |  |  | 3 |  |  | 3 |
LG&E | — |  |  | — |  |  | 1 |  |  | 1 |
KU | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
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, 2018 | $ | 42 |  |  | $ | 23 |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 4 |
Contract liabilities at June 30, 2019 | 47 |  |  | 22 |  |  | 9 |  |  | 5 |  |  | 4 |
Revenue recognized during the six months ended June 30, 2019 that was included in the contract liability balance at December 31, 2018 | 29 |  |  | 11 |  |  | 9 |  |  | 5 |  |  | 4 |
Contract liabilities at December 31, 2017 | $ | 29 |  |  | $ | 19 |  |  | $ | 8 |  |  | $ | 4 |  |  | $ | 4 |
Contract liabilities at June 30, 2018 | 38 |  |  | 14 |  |  | 8 |  |  | 4 |  |  | 3 |
Revenue recognized during the six months ended June 30, 2018 that was included in the contract liability balance at December 31, 2017 | 18 |  |  | 8 |  |  | 8 |  |  | 4 |  |  | 4 |

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