Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 73	$ 55
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	21	12
Depreciation and other items not normalized	(3)	(2)
Valuation allowance adjustments	3	8
Amortization of excess deferred income taxes	(18)	(12)
Other	1	(1)
Total increase (decrease)	1	4
Total income tax expense (benefit)	74	59
Amortization of investment tax credit including deferred taxes on basis adjustment	(3)	(1)
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	41	32
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	16	12
Depreciation and other items not normalized	(3)	(2)
Amortization of excess deferred income taxes	(3)	(3)
Other	(1)	(2)
Total increase (decrease)	9	5
Total income tax expense (benefit)	50	37
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	24	20
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4
Amortization of excess deferred income taxes	(7)	(3)
Other	(2)	(2)
Total increase (decrease)	(5)	(1)
Total income tax expense (benefit)	19	19
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	28	22
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	5	4
Amortization of excess deferred income taxes	(6)	(4)
Other	(3)	(1)
Total increase (decrease)	(4)	(1)
Total income tax expense (benefit)	$ 24	$ 21