Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
PPL Electric Utilities Corp [Member] | PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 11	$ 14		$ 37	$ 43
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	27			27		$ 32
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	44	38		126	112
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	650			650
Notes receivable from affiliate	0			0		0
PPL Electric Utilities Corp [Member] | Accounts receivable from affiliates [Member] | PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	10			10		10
PPL Electric Utilities Corp [Member] | Other Noncurrent Assets [Member] | PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	17			17		22
LG And E And KU Energy LLC [Member]
Intercompany Borrowings (Numeric) [Abstract]
Long-term debt to affiliate	1,200			1,200		650
Interest Expense with Affiliate	10	7		25	23
Notes payable with affiliates	153			153		150
LG And E And KU Energy LLC [Member] | PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	6	6		19	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			375
Notes payable with affiliates	153			$ 153		$ 150
Related Party Transaction, Rate				1.66%		3.20%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	300			$ 300
Notes receivable from affiliate	0			0		$ 0
Notes payable with affiliates	0			0
LG And E And KU Energy LLC [Member] | Company Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	450			$ 450
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
Long-term debt to affiliate	400			$ 400		400
Interest Expense with Affiliate	4	4		$ 11	11
Related Party Transaction, Rate			3.50%	3.50%
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
Long-term debt to affiliate	250			$ 250		250
Interest Expense with Affiliate	3	3		$ 8	8
Related Party Transaction, Rate			4.00%	4.00%
LG And E And KU Energy LLC [Member] | Note Payable 2 [Member] | Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Long-term debt to affiliate	550			$ 550
Interest Expense with Affiliate	3			3
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany Money Pool Agreement Maximum Borrowing Capacity	750			750
Notes payable with affiliates						0
Louisville Gas And Electric Co [Member] | LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	43	37		125	112
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany Money Pool Agreement Maximum Borrowing Capacity	650			650
Notes payable with affiliates	0			0		$ 0
Kentucky Utilities Co [Member] | LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 45	$ 42		$ 132	$ 126