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Maximum borrowing capacity under the money pool agreement with an affiliate of the reporting entity.

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Maximum loan capacity under the revolving demand note agreement with an affiliate of the reporting entity.

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Intercompany receivable related to IRS private letter ruling permitting a transfer of excess funds from the PPL Bargaining Unite Retiree Health Plan VEBA to a new subaccount within the VEBA to be used to pay medical claims of active bargaining unit employees

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of interest expense incurred on a debt or other obligation to related party.

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The amount for notes payable (written promise to pay), due to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount for notes payable (written promise to pay), payable to related parties, which are due after one year (or one business cycle).

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

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Amount of transactions with related party during the financial reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
PPL Electric Utilities Corp [Member] \| PPL Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction	$ 59	$ 59	$ 182
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	32
PPL Electric Utilities Corp [Member] \| PPL Services [Member] \| Accounts receivable from affiliates [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	10
PPL Electric Utilities Corp [Member] \| PPL Services [Member] \| Other Noncurrent Assets [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	22
PPL Electric Utilities Corp [Member] \| PPL EU Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction	152	148	64
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	150	113
Interest Expense, Related Party	31	25	18
Long-term debt to affiliate	650	650
LG And E And KU Energy LLC [Member] \| PPL Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction	28	26	20
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	$ 150	$ 113
Intercompany borrowings demand note rate on outstanding borrowing	3.20%	3.85%
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	3.50%
Interest Expense, Related Party	$ 14
Long-term debt to affiliate	$ 400
LG And E And KU Energy LLC [Member] \| Affiliated Entity [Member] \| Note Payable 1 [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany borrowings demand note rate on outstanding borrowing	4.00%
Interest Expense, Related Party	$ 10	$ 7
Long-term debt to affiliate	$ 250
LG And E And KU Energy LLC [Member] \| Company Affiliate1 [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt Instrument, Term	10 years
Interest Expense, Related Party		14	14
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]
Notes payable to affiliates	0	0
Intercompany Money Pool Agreement Maximum Borrowing Capacity	500
Louisville Gas And Electric Co [Member] \| LKS [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction	160	151	169
Kentucky Utilities Co [Member] \| Parent And Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Notes payable to affiliates	0	0
Intercompany Money Pool Agreement Maximum Borrowing Capacity	500
Kentucky Utilities Co [Member] \| LKS [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction	$ 178	$ 169	$ 190