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Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions | Jun. 30, 2020 GBP (£) | Jun. 30, 2020 USD ($) | Apr. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 USD ($)
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UNITED KINGDOM |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | £ 1,155 |  |  |  |  |
Borrowed | £ | 266 |  |  |  | £ 243 |
Letters of Credit and Commercial Paper Issued | £ | 4 |  |  |  | 4 |
Unused Capacity | 885 | $ 1,100 |  |  |  |
UNITED KINGDOM | Uncommitted Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | 100 |  |  |  |  |
Borrowed | 60 | $ 74 |  |  | 0 |
Letters of Credit and Commercial Paper Issued | £ | 4 |  |  |  | 4 |
Unused Capacity | £ | £ 36 |  |  |  |  |
Interest rate on outstanding borrowing | 1.35% | 1.35% |  |  |  |
WPD PLC [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | £ 210 |  |  |  |  |
Borrowed | 162 | $ 200 |  |  | 155 | $ 200
Letters of Credit and Commercial Paper Issued | £ | 0 |  |  |  | £ 0 |
Unused Capacity | £ | £ 48 |  |  |  |  |
Interest rate on outstanding borrowing | 1.00% | 1.00% |  |  | 2.52% | 2.52%
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | £ 220 |  |  |  |  |
Borrowed | 0 |  |  |  | £ 40 | $ 51
Letters of Credit and Commercial Paper Issued | £ | 0 |  |  |  | £ 0 |
Unused Capacity | £ | 220 |  |  |  |  |
Interest rate on outstanding borrowing |  |  |  |  | 1.09% | 1.09%
WPD South Wales [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | 125 |  |  |  |  |
Borrowed | 5 | $ 6 |  |  | £ 0 |
Letters of Credit and Commercial Paper Issued | £ | 0 |  |  |  | 0 |
Unused Capacity | £ | £ 120 |  |  |  |  |
Interest rate on outstanding borrowing | 0.60% | 0.60% |  |  |  |
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | £ 250 |  |  |  |  |
Borrowed | £ | 0 |  |  |  | 0 |
Letters of Credit and Commercial Paper Issued | £ | 0 |  |  |  | 0 |
Unused Capacity | £ | 250 |  |  |  |  |
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity | £ | 250 |  |  |  |  |
Borrowed | 39 | $ 48 |  |  | 48 | $ 62
Letters of Credit and Commercial Paper Issued | £ | 0 |  |  |  | £ 0 |
Unused Capacity | £ | £ 211 |  |  |  |  |
Interest rate on outstanding borrowing | 0.60% | 0.60% |  |  | 1.11% | 1.11%
PPL Capital Funding [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | $ 1,950 |  |  |  |
Borrowed |  | 400 |  |  |  | $ 0
Letters of Credit and Commercial Paper Issued |  | 15 |  |  |  | 465
Unused Capacity |  | $ 1,535 |  |  |  |
Interest rate on outstanding borrowing | 1.04% | 1.04% |  |  |  |
PPL Capital Funding [Member] | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | $ 1,450 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 450
Unused Capacity |  | 1,450 |  |  |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 200 | $ 100 | $ 200 |  |
Borrowed |  | 200 | $ 100 | $ 200 |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 0
Unused Capacity |  | 0 |  |  |  |
Interest rate on outstanding borrowing |  |  | 1.73% | 1.96% |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 100 |  |  |  |
Borrowed |  | 100 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 0
Unused Capacity |  | 0 |  |  |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 100 |  |  |  |
Borrowed |  | 100 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 0
Unused Capacity |  | 0 |  |  |  |
PPL Capital Funding [Member] | Bilateral Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 50 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 0
Unused Capacity |  | 50 |  |  |  |
PPL Capital Funding [Member] | Bilateral Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 50 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 15 |  |  |  | 15
Unused Capacity |  | 35 |  |  |  |
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 |  | 201 |  |  |  | 1
Unused Capacity |  | 449 |  |  |  |
LGE [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 500 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 500 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
KU [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 400 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 150
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 |  |  |  | 150
Unused Capacity |  | 400 |  |  |  |
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 |  | 201 |  |  |  | 1
Unused Capacity |  | 449 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 500 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
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 |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 400 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 150
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 |  |  |  | 150
Unused Capacity |  | 400 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 500 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
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 |  | 0 |  |  |  | 238
Unused Capacity |  | 500 |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Capacity |  | 400 |  |  |  |
Borrowed |  | 0 |  |  |  | 0
Letters of Credit and Commercial Paper Issued |  | 0 |  |  |  | 150
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 |  |  |  | $ 150
Unused Capacity |  | $ 400 |  |  |  |

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