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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