Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 84	$ 57	$ 240	$ 189
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	20	20	48	48
Depreciation and other items not normalized	(6)	(4)	(20)	(14)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(4)	(2)	(9)	(4)
Amortization of excess deferred income taxes	(13)	(13)	(34)	(33)
Other	(1)	0	4	3
Total increase (decrease)	(4)	1	(11)	0
Total income tax expense (benefit)	80	58	229	189
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	44	40	132	122
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	13	13	40	39
Depreciation and other items not normalized	(5)	(2)	(17)	(12)
Amortization of excess deferred income taxes	(2)	(3)	(7)	(8)
Other	(1)	(1)	(2)	0
Total increase (decrease)	5	7	14	19
Total income tax expense (benefit)	49	47	146	141
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	22	20	64	62
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4	12	11
Depreciation and other items not normalized	(1)	(1)	(3)	(1)
Amortization of excess deferred income taxes	(3)	(3)	(10)	(9)
Other	(1)	0	(2)	(2)
Total increase (decrease)	(1)	0	(3)	(1)
Total income tax expense (benefit)	21	20	61	61
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	29	26	82	74
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	5	4	15	13
Depreciation and other items not normalized	(1)	(1)	(3)	(1)
Amortization of excess deferred income taxes	(4)	(4)	(13)	(13)
Other	(1)	(1)	(3)	(3)
Total increase (decrease)	(1)	(2)	(4)	(4)
Total income tax expense (benefit)	$ 28	$ 24	$ 78	$ 70