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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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Increase in maximum loan capacity under the revolving demand note agreement with an affiliate of the reporting entity.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

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Amount of interest income earned from interest-bearing assets owed to the entity by 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), 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	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2018	Jun. 30, 2018
PPL Electric Utilities Corp [Member]
Intercompany Borrowings (Numeric) [Abstract]
Interest Income from Affiliate			$ 8	$ 5	$ 0
PPL Electric Utilities Corp [Member] \| PPL Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction			59	182	132
PPL Electric Utilities Corp [Member] \| PPL EU Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction			148	64	69
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
Intercompany Note Affiliate Maximum Borrowing Capacity Increase							$ 250
LG And E And KU Energy LLC [Member]
Intercompany Borrowings (Numeric) [Abstract]
Notes payable to affiliates			113	225
Interest Expense, Related Party			25	18	17
Long-term debt to affiliate			650	400
LG And E And KU Energy LLC [Member] \| PPL Services [Member]
Related Party Transactions [Line Items]
Related Party Transaction, Amounts of Transaction			$ 26	$ 20	18
LG And E And KU Energy LLC [Member] \| PPL Energy Funding [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany borrowings demand note rate on outstanding borrowing			3.85%	2.87%
Notes payable to affiliates			$ 113	$ 225
Intercompany note with affiliate maximum borrowing capacity			$ 375
Intercompany Note Affiliate Maximum Borrowing Capacity Increase						$ 75
LG And E And KU Energy LLC [Member] \| PPL Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt Instrument, Term			10 years
Intercompany borrowings demand note rate on outstanding borrowing			3.50%
Interest Expense, Related Party			$ 14	14
Long-term debt to affiliate			400	400
LG And E And KU Energy LLC [Member] \| Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Interest Expense, Related Party		$ 7
LG And E And KU Energy LLC [Member] \| Affiliated Entity [Member] \| Note Payable [Member]
Intercompany Borrowings (Numeric) [Abstract]
Notes Payable, Noncurrent	$ 250
Stated interest rate	4.00%
Maturity date (in years)	May 31, 2028
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			151	169	178
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			$ 169	$ 190	$ 194