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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions |  | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 GBP (£) | Oct. 01, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Oct. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 01, 2020 USD ($) | Aug. 01, 2020 USD ($) | Jun. 01, 2020 USD ($) | Apr. 01, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
PPL Electric [Member] | Pollution Control Revenue Refunding Bonds [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 90 |  |  |  |  |  |  |
Stated interest rate | 0.40% |  |  |  | 0.40% |  |  |  |  |  |  |
PPL Electric [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, Floating Rate Series due 2023 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 250 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 249 |  |  |  |  |  |  |  |  |  |
PPL Capital Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | $ 1,950 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 400 |  |  |  |  |  | $ 0
PPL Capital Funding [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 200 |  |  |  | $ 100 | $ 200 |
Borrowed |  |  |  |  |  | 200 |  |  |  | $ 100 | $ 200 | 0
Interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  | 1.73% | 1.96% |
PPL Capital Funding [Member] | Senior Notes [Member] | Senior Notes Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 4.125% |  |
Proceeds from Issuance of Secured Debt |  |  |  | $ 993 |  |  |  |  |  |  |  |
PPL Capital Funding [Member] | Term Loan Facility [Member] | Term Loan Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  |  |  |  |  | $ 100 |  |
Borrowed |  |  |  |  |  |  |  |  |  | $ 100 |  |
Interest rate on outstanding borrowing |  |  |  |  |  |  |  |  |  | 1.72% |  |
LKE [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 475 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.75% |  |  |
LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 500 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 0 |  |  |  |  |  | 0
KU [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 400 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 0 |  |  |  |  |  | 0
KU [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.30% |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  | $ 493 |  |  |  |  |  |  |  |  |
KU [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2020 [Member] | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.25% |  |  |  |
Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.30% |  |  |  |  |
Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2001 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 0.90% |  |  |  |  |
WPD South Wales [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ | £ 150 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 9.25% |  |  |  | 9.25% |  |  |  |  |  |  |
WPD South Wales [Member] | Senior Notes [Member] | Senior Notes Due 2035 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ | £ 250 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.625% |  |  |  | 1.625% |  |  |  |  |  |  |
Proceeds from Issuance of Secured Debt | £ 247 | 319 |  |  |  |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | Pollution Control Revenue Refunding Bonds [Member] | Remarketed [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 90 |  |  |  |  |  |  |
Stated interest rate | 0.40% |  |  |  | 0.40% |  |  |  |  |  |  |
PPL Electric Utilities Corp [Member] | First Mortgage Bond [Member] | First Mortgage Bonds, Floating Rate Series due 2023 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 250 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 249 |  |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | Senior Notes [Member] | Senior Notes Due 2020 [Member] | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 475 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.75% |  |  |
LG And E And KU Energy LLC [Member] | LGE [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 500 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 0 |  |  |  |  |  | 0
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 400 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 0 |  |  |  |  |  | 0
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.30% |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  | 493 |  |  |  |  |  |  |  |  |
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2020 [Member] | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.25% |  |  |  |
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.30% |  |  |  |  |
LG And E And KU Energy LLC [Member] | Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2001 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 0.90% |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 500 |  |  |  |  |  |
Borrowed |  |  |  |  |  | 0 |  |  |  |  |  | 0
Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2016 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 125 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 1.30% |  |  |  |  |
Louisville Gas And Electric Co [Member] | Pollution Control Revenue Refunding Bonds, 2001 Series [Member] | Remarketed [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 23 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 0.90% |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capacity |  |  |  |  |  | 400 |  |  |  |  |  |
Borrowed |  |  |  |  |  | $ 0 |  |  |  |  |  | $ 0
Kentucky Utilities Co [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2050 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.30% |  |  |
Proceeds from Issuance of First Mortgage Bond |  |  | $ 493 |  |  |  |  |  |  |  |  |
Kentucky Utilities Co [Member] | First Mortgage Bond [Member] | First Mortgage Bonds due 2020 [Member] | Redemption [Member] |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 500 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.25% |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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