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Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 USD ($)
U.K. [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | £ 1,155 |  |  |
Borrowed | £ |  | 243 |  | £ 195 |
Letters of credit and commercial paper issued | £ |  | 4 |  | 4 |
Unused capacity | $ 1,200 | 908 |  |  |
U.K. [Member] | Uncommitted Credit Facilities [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | 100 |  |  |
Borrowed | £ |  | 0 |  | 0 |
Letters of credit and commercial paper issued | £ |  | 4 |  | 4 |
Unused capacity | £ |  | 96 |  |  |
WPD PLC [Member] | U.K. [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | 210 |  |  |
Borrowed | $ 200 | 155 | $ 200 | 157 |
Letters of credit and commercial paper issued | £ |  | 0 |  | £ 0 |
Unused capacity | £ |  | £ 55 |  |  |
Minimum interest coverage ratio allowed under the credit facility | 3.0 times |  |  |  |
Maximum percentage of total net debt to RAV allowed under the credit facility | 85.00% | 85.00% |  |  |
Interest rate on outstanding borrowing | 2.52% | 2.52% | 3.17% | 3.17% |
WPD South West [Member] | U.K. [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | £ 245 |  |  |
Borrowed | $ 51 | 40 |  | £ 0 |
Letters of credit and commercial paper issued | £ |  | 0 |  | 0 |
Unused capacity | £ |  | £ 205 |  |  |
Minimum interest coverage ratio allowed under the credit facility | 3.0 times |  |  |  |
Maximum percentage of total net debt to RAV allowed under the credit facility | 85.00% | 85.00% |  |  |
Interest rate on outstanding borrowing | 1.09% | 1.09% |  |  |
WPD East Midlands [Member] | U.K. [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | £ 300 |  |  |
Borrowed |  | 0 | $ 48 | 38 |
Letters of credit and commercial paper issued | £ |  | 0 |  | £ 0 |
Unused capacity | £ |  | £ 300 |  |  |
Minimum interest coverage ratio allowed under the credit facility | 3.0 times |  |  |  |
Maximum percentage of total net debt to RAV allowed under the credit facility | 85.00% | 85.00% |  |  |
Interest rate on outstanding borrowing |  |  | 1.12% | 1.12% |
WPD West Midlands [Member] | U.K. [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | £ |  | £ 300 |  |  |
Borrowed | $ 62 | 48 |  | £ 0 |
Letters of credit and commercial paper issued | £ |  | 0 |  | £ 0 |
Unused capacity | £ |  | £ 252 |  |  |
Minimum interest coverage ratio allowed under the credit facility | 3.0 times |  |  |  |
Maximum percentage of total net debt to RAV allowed under the credit facility | 85.00% | 85.00% |  |  |
Interest rate on outstanding borrowing | 1.11% | 1.11% |  |  |
PPL Capital Funding [Member] | U.S. [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 1,550 |  |  |  |
Borrowed | 0 |  | $ 0 |  |
Letters of credit and commercial paper issued | 465 |  | 684 |  |
Unused capacity | 1,085 |  |  |  |
PPL Capital Funding [Member] | U.S. [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 1,450 |  |  |  |
Borrowed |  |  | 0 |  |
Letters of credit and commercial paper issued | 450 |  | 669 |  |
Unused capacity | $ 1,000 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
PPL Capital Funding [Member] | U.S. [Member] | Syndicated Credit Facility 1 [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
PPL Capital Funding [Member] | U.S. [Member] | Bilateral Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 100 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 15 |  | 15 |  |
Unused capacity | 85 |  |  |  |
Potential capacity increase | $ 30 |  |  |  |
PPL Capital Funding [Member] | U.S. [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
PPL Electric [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 650 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 1 |  | 1 |  |
Unused capacity | $ 649 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
LKE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
LGE [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 500 |  |  |  |
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | 262 |  |  |  |
LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 500 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | $ 262 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
LGE [Member] | Term Loan Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  |  |  | $ 200
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 0 |  | $ 0 |  |
Unused capacity | 0 |  |  |  |
Interest rate on outstanding borrowing |  |  | 2.97% | 2.97% |
KU [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | $ 0 |  |
Letters of credit and commercial paper issued | 150 |  | 433 |  |
Unused capacity | 250 |  |  |  |
KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 150 |  | 235 |  |
Unused capacity | $ 250 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
KU [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 0 |  | 198 |  |
Unused capacity | $ 0 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 650 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 1 |  | 1 |  |
Unused capacity | $ 649 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
LG And E And KU Energy LLC [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 0 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 0 |  | 0 |  |
Unused capacity | $ 0 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | $ 500 |  |  |  |
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | 262 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 500 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | $ 262 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  | 200 |  |
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 0 |  | $ 0 |  |
Unused capacity | 0 |  |  |  |
Interest rate on outstanding borrowing |  |  | 2.97% | 2.97% |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | $ 0 |  |
Letters of credit and commercial paper issued | 150 |  | 433 |  |
Unused capacity | 250 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 150 |  | 235 |  |
Unused capacity | $ 250 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 0 |  | 198 |  |
Unused capacity | $ 0 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 500 |  |  |  |
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | 262 |  |  |  |
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 500 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 238 |  | 279 |  |
Unused capacity | $ 262 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
Louisville Gas And Electric Co [Member] | Term Loan Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  | 200 |  |
Borrowed | 0 |  | 200 |  |
Letters of credit and commercial paper issued | 0 |  | $ 0 |  |
Unused capacity | 0 |  |  |  |
Interest rate on outstanding borrowing |  |  | 2.97% | 2.97% |
Kentucky Utilities Co [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | $ 0 |  |
Letters of credit and commercial paper issued | 150 |  | 433 |  |
Unused capacity | 250 |  |  |  |
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 400 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 150 |  | 235 |  |
Unused capacity | $ 250 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member] |  |  |  |  |
Financing Activities [Line Items] |  |  |  |  |
Capacity | 0 |  |  |  |
Borrowed | 0 |  | 0 |  |
Letters of credit and commercial paper issued | 0 |  | $ 198 |  |
Unused capacity | $ 0 |  |  |  |
Maximum percentage of debt to total capitalization allowed under the credit facility | 70.00% | 70.00% |  |  |
Potential capacity increase | $ 250 |  |  |  |

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