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Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions | Jun. 30, 2019 USD ($) | Jun. 30, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£)
--- | --- | --- | --- | ---
UNITED KINGDOM |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | £ 1,155 |  |
Borrowed | £ |  | 272 |  | £ 195
Letters of Credit and Commercial Paper Issued | £ |  | 4 |  | 4
Unused Capacity | $ 1,100 | 879 |  |
UNITED KINGDOM | Uncommitted Credit Facilities [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | 100 |  |
Borrowed | £ |  | 0 |  | 0
Letters of Credit and Commercial Paper Issued | £ |  | 4 |  | 4
Unused Capacity | £ |  | 96 |  |
WPD PLC [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | 210 |  |
Borrowed | $ 200 | 158 | $ 200 | 157
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  | £ 0
Unused Capacity | £ |  | £ 52 |  |
Interest rate on outstanding borrowing | 3.25% | 3.25% | 3.17% | 3.17%
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | £ 245 |  |
Borrowed | £ |  | 0 |  | £ 0
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  | 0
Unused Capacity | £ |  | 245 |  |
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | 300 |  |
Borrowed | $ 102 | 81 | $ 48 | 38
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  | £ 0
Unused Capacity | £ |  | £ 219 |  |
Interest rate on outstanding borrowing | 1.13% | 1.13% | 1.12% | 1.12%
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | £ |  | £ 300 |  |
Borrowed | $ 41 | 33 |  | £ 0
Letters of Credit and Commercial Paper Issued | £ |  | 0 |  | £ 0
Unused Capacity | £ |  | £ 267 |  |
Interest rate on outstanding borrowing | 1.13% | 1.13% |  |
PPL Capital Funding [Member] | UNITED STATES |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | $ 1,550 |  |  |
Borrowed | 0 |  | $ 0 |
Letters of Credit and Commercial Paper Issued | 1,029 |  | 684 |
Unused Capacity | 521 |  |  |
PPL Capital Funding [Member] | UNITED STATES | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 1,450 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 1,014 |  | 669 |
Unused Capacity | 436 |  |  |
PPL Capital Funding [Member] | UNITED STATES | Bilateral Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 100 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 15 |  | 15 |
Unused Capacity | 85 |  |  |
PPL Electric [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 650 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 186 |  | 1 |
Unused Capacity | 464 |  |  |
LGE [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
LGE [Member] | Term Loan Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 0 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 0 |  | 0 |
Unused Capacity | 0 |  |  |
KU [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 598 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | 433 |
Unused Capacity | 400 |  |  |
KU [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 400 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  | 235 |
Unused Capacity | 400 |  |  |
KU [Member] | Letter Of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 198 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | 198 |
Unused Capacity | 0 |  |  |
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 650 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 186 |  | 1 |
Unused Capacity | 464 |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 0 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 0 |  | 0 |
Unused Capacity | 0 |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 598 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | 433 |
Unused Capacity | 400 |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 400 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  | 235 |
Unused Capacity | 400 |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 198 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | 198 |
Unused Capacity | 0 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 500 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 96 |  | 279 |
Unused Capacity | 404 |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 0 |  |  |
Borrowed | 0 |  | 200 |
Letters of Credit and Commercial Paper Issued | 0 |  | 0 |
Unused Capacity | 0 |  |  |
Kentucky Utilities Co [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 598 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | 433 |
Unused Capacity | 400 |  |  |
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 400 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 0 |  | 235 |
Unused Capacity | 400 |  |  |
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Capacity | 198 |  |  |
Borrowed | 0 |  | 0 |
Letters of Credit and Commercial Paper Issued | 198 |  | $ 198 |
Unused Capacity | $ 0 |  |  |

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