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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 01, 2020 | May 01, 2020
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 50 | $ 59 | $ 59 |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 22 | 32 |  |  |
PPL Electric Utilities Corp [Member] | PPL Services [Member] | Accounts receivable from affiliates [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 10 | 10 |  |  |
PPL Electric Utilities Corp [Member] | PPL Services [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
VEBA Funds Receivable | 12 | 22 |  |  |
PPL Electric Utilities Corp [Member] | PPL EU Services [Member] |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 176 | 152 | 148 |  |
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | 650 |  |  |  |
Notes Receivable, Related Parties, Current | 0 | 0 |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Notes payable to affiliates | 251 | 150 |  |  |
Interest Expense, Related Party | 37 | 31 | 25 |  |
Long-term debt to affiliate | 1,200 | 650 |  |  |
LG And E And KU Energy LLC [Member] | PPL Services [Member] |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 27 | 28 | 26 |  |
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | 375 |  |  |  |
Notes payable to affiliates | $ 251 | $ 150 |  |  |
Intercompany borrowings demand note rate on outstanding borrowing | 1.65% | 3.20% |  |  |
LG And E And KU Energy LLC [Member] | Affiliated Entity [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Notes Payable, Related Parties |  |  |  |  | $ 450
LG And E And KU Energy LLC [Member] | Affiliated Entity [Member] | Note Payable [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany borrowings demand note rate on outstanding borrowing | 3.90% |  |  |  |
Interest Expense, Related Party | $ 33 |  |  |  |
Long-term debt to affiliate | $ 1,200 |  |  | $ 550 |
LG And E And KU Energy LLC [Member] | Company Affiliate1 [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |
Interest Expense, Related Party |  | $ 24 | 21 |  |
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany note with affiliate maximum borrowing capacity | $ 300 |  |  |  |
Long-term debt to affiliate | 0 | 0 |  |  |
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany Money Pool Agreement Maximum Borrowing Capacity | 750 |  |  |  |
Louisville Gas And Electric Co [Member] | LKS [Member] |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | 170 | 160 | 151 |  |
Kentucky Utilities Co [Member] | Parent And Affiliate [Member] |  |  |  |  |
Intercompany Borrowings (Numeric) [Abstract] |  |  |  |  |
Intercompany Money Pool Agreement Maximum Borrowing Capacity | 650 |  |  |  |
Kentucky Utilities Co [Member] | LKS [Member] |  |  |  |  |
Related Party Transactions [Line Items] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 180 | $ 178 | $ 169 |  |

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