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Financing Activities (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Schedule of Line of Credit Facilities | The following credit facilities were in place at:
| June 30, 2019 |  | December 31, 2018
| Expiration Date |  | Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued |  | Unused Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.K. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WPD plc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (a) | Jan. 2023 |  | £ | 210 |  |  | £ | 158 |  |  | £ | — |  |  | £ | 52 |  |  | £ | 157 |  |  | £ | — |
WPD (South West) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | July 2021 |  | 245 |  |  | — |  |  | — |  |  | 245 |  |  | — |  |  | — |
WPD (East Midlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (b) | July 2021 |  | 300 |  |  | 81 |  |  | — |  |  | 219 |  |  | 38 |  |  | — |
WPD (West Midlands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility (c) | July 2021 |  | 300 |  |  | 33 |  |  | — |  |  | 267 |  |  | — |  |  | — |
Uncommitted Credit Facilities |  |  | 100 |  |  | — |  |  | 4 |  |  | 96 |  |  | — |  |  | 4 |
Total U.K. Credit Facilities (d) |  |  | £ | 1,155 |  |  | £ | 272 |  |  | £ | 4 |  |  | £ | 879 |  |  | £ | 195 |  |  | £ | 4 |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |
PPL Capital Funding |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2024 |  | $ | 1,450 |  |  | $ | — |  |  | $ | 1,014 |  |  | $ | 436 |  |  | $ | — |  |  | $ | 669 |
Bilateral Credit Facility | Mar. 2020 |  | 100 |  |  | — |  |  | 15 |  |  | 85 |  |  | — |  |  | 15 |
Total PPL Capital Funding Credit Facilities |  |  | $ | 1,550 |  |  | $ | — |  |  | $ | 1,029 |  |  | $ | 521 |  |  | $ | — |  |  | $ | 684 |
| June 30, 2019 |  | December 31, 2018
| Expiration Date |  | Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued |  | Unused Capacity |  | Borrowed |  | Letters of Credit and Commercial Paper Issued
PPL Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2024 |  | $ | 650 |  |  | $ | — |  |  | $ | 186 |  |  | $ | 464 |  |  | $ | — |  |  | $ | 1 |
LG&E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2024 |  | $ | 500 |  |  | $ | — |  |  | $ | 96 |  |  | $ | 404 |  |  | $ | — |  |  | $ | 279 |
Term Loan Credit Facility | Oct. 2019 |  | — |  |  | — |  |  | — |  |  | — |  |  | 200 |  |  | — |
Total LG&E Credit Facilities |  |  | $ | 500 |  |  | $ | — |  |  | $ | 96 |  |  | $ | 404 |  |  | $ | 200 |  |  | $ | 279 |
KU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Credit Facility | Jan. 2024 |  | $ | 400 |  |  | $ | — |  |  | $ | — |  |  | $ | 400 |  |  | $ | — |  |  | $ | 235 |
Letter of Credit Facility | Oct. 2020 |  | 198 |  |  | — |  |  | 198 |  |  | — |  |  | — |  |  | 198 |
Total KU Credit Facilities |  |  | $ | 598 |  |  | $ | — |  |  | $ | 198 |  |  | $ | 400 |  |  | $ | — |  |  | $ | 433 |
(a) | The amounts borrowed at June 30, 2019 and December 31, 2018 were USD-denominated borrowings of $200 million for both periods, which bore interest at 3.25% and 3.17%.
(b) | The amounts borrowed at June 30, 2019 and December 31, 2018 were GBP-denominated borrowings which equated to $102 million and $48 million and bore interest at 1.13% and 1.12%.
(c) | The amount borrowed at June 30, 2019 was GBP-denominated borrowings which equated to $41 million and bore interest at 1.13%.
(d) | At June 30, 2019, the unused capacity under the U.K. credit facilities was $1.1 billion.
Schedule of Short-term Debt | The following commercial paper programs were in place at:
| June 30, 2019 |  | December 31, 2018
| Weighted - Average Interest Rate |  | Capacity |  | Commercial Paper Issuances |  | Unused Capacity |  | Weighted - Average Interest Rate |  | Commercial Paper Issuances
PPL Capital Funding | 2.74% |  | $ | 1,500 |  |  | $ | 1,014 |  |  | $ | 486 |  |  | 2.82% |  | $ | 669 |
PPL Electric | 2.59% |  | 650 |  |  | 185 |  |  | 465 |  |  |  |  | — |
LG&E | 2.59% |  | 350 |  |  | 96 |  |  | 254 |  |  | 2.94% |  | 279 |
KU |  |  | 350 |  |  | — |  |  | 350 |  |  | 2.94% |  | 235 |
Total |  |  | $ | 2,850 |  |  | $ | 1,295 |  |  | $ | 1,555 |  |  |  |  | $ | 1,183 |

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