Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 60	$ 45	$ 167	$ 150
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	16	8	49	56
Depreciation and other items not normalized	(2)	0	(9)	(8)
Valuation allowance adjustments	1	(1)	6	9
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(9)	(1)	(11)	(3)
Amortization of excess deferred income taxes	(13)	(7)	(33)	(47)
State income tax rate change	(1)	5	0	5
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	3	0	(2)	(1)
Other	2	2	5	3
Total increase (decrease)	(2)	(4)	3	(3)
Total income tax expense (benefit)	58	41	170	147
Amortization of investment tax credit including deferred taxes on basis adjustment	(1)	0	(2)	(7)
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	38	38	107	114
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	13	14	36	43
Depreciation and other items not normalized	(1)	(1)	(8)	(7)
Amortization of excess deferred income taxes	(4)	(4)	(8)	(9)
State income tax rate change	0	9	1	9
Other	(3)	(1)	0	(1)
Total increase (decrease)	5	(1)	19	17
Total income tax expense (benefit)	43	37	126	131
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	21	21	56	57
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4	10	11
Amortization of excess deferred income taxes	(3)	(3)	(9)	(17)
Other	(1)	(1)	(2)	(2)
Total increase (decrease)	0	0	(1)	(8)
Total income tax expense (benefit)	21	21	55	49
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	26	25	63	70
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	5	5	12	13
Amortization of excess deferred income taxes	(5)	(4)	(13)	(16)
Other	(2)	(2)	(3)	(4)
Total increase (decrease)	(2)	(1)	(4)	(7)
Total income tax expense (benefit)	$ 24	$ 24	$ 59	$ 63