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Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions | Apr. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£)
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UNITED KINGDOM |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  |  | £ 1,155 |  |
Borrowed | £ |  |  | 210 |  | £ 243
Letters of Credit and Commercial Paper Issued | £ |  |  | 4 |  | 4
Unused Capacity |  | $ 1,200 | 943 |  |
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 | 156 | $ 200 | 155
Letters of Credit and Commercial Paper Issued | £ |  |  | 0 |  | £ 0
Unused Capacity | £ |  |  | £ 56 |  |
Interest rate on outstanding borrowing |  | 2.43% | 2.43% | 2.52% | 2.52%
Borrowed | £ |  |  | £ 154 |  |
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  |  | 245 |  |
Borrowed |  |  | 0 | $ 51 | £ 40
Letters of Credit and Commercial Paper Issued | £ |  |  | 0 |  | £ 0
Unused Capacity | £ |  |  | 245 |  |
Interest rate on outstanding borrowing |  |  |  | 1.09% | 1.09%
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  |  | 300 |  |
Borrowed | £ |  |  | 0 |  | £ 0
Letters of Credit and Commercial Paper Issued | £ |  |  | 0 |  | 0
Unused Capacity | £ |  |  | 300 |  |
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | £ |  |  | 300 |  |
Borrowed |  | $ 69 | 54 | $ 62 | 48
Letters of Credit and Commercial Paper Issued | £ |  |  | 0 |  | £ 0
Unused Capacity | £ |  |  | £ 246 |  |
Interest rate on outstanding borrowing |  | 1.11% | 1.11% | 1.11% | 1.11%
PPL Capital Funding [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 1,750 |  |  |
Borrowed |  | 859 |  | $ 0 |
Letters of Credit and Commercial Paper Issued |  | 195 |  | 465 |
Unused Capacity |  | $ 696 |  |  |
Interest rate on outstanding borrowing |  | 1.97% | 1.97% |  |
PPL Capital Funding [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 1,450 |  |  |
Borrowed |  | 575 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 180 |  | 450 |
Unused Capacity |  | 695 |  |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 200 |  |  |
Borrowed |  | 200 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 0 |  | 0 |
Unused Capacity |  | $ 0 |  |  |
Interest rate on outstanding borrowing |  | 1.96% | 1.96% |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] | Subsequent Event [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity | $ 100 |  |  |  |
Borrowed | $ 100 |  |  |  |
Interest rate on outstanding borrowing | 1.73% |  |  |  |
PPL Capital Funding [Member] | Bilateral Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 50 |  |  |
Borrowed |  | 50 |  | 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 |  | 34 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 15 |  | 15 |
Unused Capacity |  | $ 1 |  |  |
PPL Electric [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowing |  | 1.96% | 1.96% |  |
PPL Electric [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 650 |  |  |
Borrowed |  | 85 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 1 |  | 1 |
Unused Capacity |  | 564 |  |  |
LGE [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | $ 341 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | 341 |  |  |
KU [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | 150 |
Unused Capacity |  | $ 256 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | 150 |
Unused Capacity |  | $ 256 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowing |  | 1.96% | 1.96% |  |
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 650 |  |  |
Borrowed |  | 85 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 1 |  | 1 |
Unused Capacity |  | 564 |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | $ 341 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | 341 |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | 150 |
Unused Capacity |  | $ 256 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | 150 |
Unused Capacity |  | 256 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | $ 341 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 500 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 59 |  | 238 |
Unused Capacity |  | 341 |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | 150 |
Unused Capacity |  | $ 256 |  |  |
Interest rate on outstanding borrowing |  | 1.81% | 1.81% |  |
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Capacity |  | $ 400 |  |  |
Borrowed |  | 100 |  | 0 |
Letters of Credit and Commercial Paper Issued |  | 44 |  | $ 150 |
Unused Capacity |  | $ 256 |  |  |

X
- Definition The carrying value as of the date borrowed of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References No definition available. + Details
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