Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		$ 32	$ (40)	$ 104	$ 15
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		27	(18)	48	(5)
Depreciation and other items not normalized		(5)	(2)	(8)	(4)
Valuation allowance adjustments		7	26	10	34
Amortization of excess deferred income taxes		(22)	(8)	(40)	(20)
Other		(3)	4	(1)	2
Total increase (decrease)		0	385	2	389
Total income tax expense (benefit)		32	345	106	404
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		0	383	0	383
Amortization of investment tax credit including deferred taxes on basis adjustment		(4)	0	(7)	(1)
Deferred Tax Assets, Valuation Allowance			25		25
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2021, Amount					383
Minimum [Member] | Forecast [Member] | Regulated Deferred Income Taxes Reduction
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 200
Minimum [Member] | Forecast [Member] | Deferred Tax Benefit
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	3
Maximum [Member] | Forecast [Member] | Regulated Deferred Income Taxes Reduction
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	300
Maximum [Member] | Forecast [Member] | Deferred Tax Benefit
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 7
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		35	27	76	59
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		13	10	28	22
Depreciation and other items not normalized		(3)	(2)	(6)	(4)
Amortization of excess deferred income taxes		(2)	(3)	(5)	(6)
Other		1	2	1	0
Total increase (decrease)		9	7	18	12
Total income tax expense (benefit)		44	34	94	71
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		13	12	37	32
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		2	2	7	6
Amortization of excess deferred income taxes		(7)	(3)	(14)	(6)
Other		1	1	(2)	(1)
Total increase (decrease)		(4)	0	(9)	(1)
Total income tax expense (benefit)		9	12	28	31
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		17	15	45	37
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		3	3	8	7
Amortization of excess deferred income taxes		(6)	(4)	(12)	(8)
Other		1	(1)	(2)	(2)
Total increase (decrease)		(2)	(2)	(6)	(3)
Total income tax expense (benefit)		$ 15	$ 13	$ 39	$ 34