Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 55	$ 56
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	12	13
Depreciation and other items not normalized	(2)	(2)
Valuation allowance adjustments	8	6
Amortization of excess deferred income taxes	(12)	(11)
Other	(2)	(1)
Total increase (decrease)	4	5
Total income tax expense (benefit)	59	61
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	32	33
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	12	13
Depreciation and other items not normalized	(2)	(2)
Amortization of excess deferred income taxes	(3)	(3)
Other	(2)	0
Total increase (decrease)	5	8
Total income tax expense (benefit)	37	41
LG And E And KU Energy LLC [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	37	35
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	7	7
Valuation allowance adjustments	(4)	0
Amortization of excess deferred income taxes	(7)	(7)
Other	(3)	(1)
Total increase (decrease)	(7)	(1)
Total income tax expense (benefit)	30	34
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	20	19
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4
Amortization of excess deferred income taxes	(3)	(3)
Other	(2)	(1)
Total increase (decrease)	(1)	0
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	22	21
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4
Amortization of excess deferred income taxes	(4)	(4)
Other	(1)	(1)
Total increase (decrease)	(1)	(1)
Total income tax expense (benefit)	$ 21	$ 20