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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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Contractual interest rate for funds borrowed, under the debt agreement.

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

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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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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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 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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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	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	May 31, 2018
PPL Electric Utilities Corp [Member] \| PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 16	$ 16
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	44		$ 45
PPL Electric Utilities Corp [Member] \| PPL EU Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	37	35
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
PPL Electric Utilities Corp [Member] \| Accounts receivable from affiliates [Member] \| PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	10		10
PPL Electric Utilities Corp [Member] \| Other Noncurrent Assets [Member] \| PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	34		35
LG And E And KU Energy LLC [Member]
Intercompany Borrowings (Numeric) [Abstract]
Long-term debt to affiliate	650		650
Interest Expense with Affiliate	7	5
Notes payable with affiliates	187		113
LG And E And KU Energy LLC [Member] \| PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	9	7
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 with affiliates	$ 187		$ 113
Related Party Transaction, Rate	3.99%		3.85%
LG And E And KU Energy LLC [Member] \| PPL Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	$ 300
Notes Receivable, Related Parties, Noncurrent	$ 0		$ 0
LG And E And KU Energy LLC [Member] \| PPL Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt instrument term (in years)	10 years
Long-term debt to affiliate	$ 400
Interest Expense with Affiliate	$ 4	4
Related Party Transaction, Rate	3.50%
LG And E And KU Energy LLC [Member] \| Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Interest Expense with Affiliate	$ 3
LG And E And KU Energy LLC [Member] \| Note Payable [Member] \| Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt instrument term (in years)	10 years
Notes Payable, Noncurrent				$ 250
Stated interest rate				4.00%
Louisville Gas And Electric Co [Member] \| LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 38	38
Kentucky Utilities Co [Member] \| LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 43	$ 42