Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		$ 45		$ 55	$ 150	$ 70
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		8		17	56	12
Depreciation and other items not normalized		0		0	(8)	(4)
Valuation allowance adjustments		(1)		5	9	39
Amortization of excess deferred income taxes		(7)		(18)	(47)	(38)
State income tax rate change		(5)		0	(5)	0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	$ (1)	0	$ (4)	(4)
Other		1		(3)	0	(1)
Total increase (decrease)		(4)		(4)	(3)	385
Total income tax expense (benefit)		41		51	147	455
Amortization of investment tax credit including deferred taxes on basis adjustment		0		(1)	(7)	(2)
Deferred Tax Assets, Valuation Allowance				31		31
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2021, Amount		0		0	0	383
Regulated Deferred Income Taxes Reduction
Increase (decrease) due to: [Abstract]
State income tax rate change		274
Deferred Tax Benefit
Increase (decrease) due to: [Abstract]
State income tax rate change		5
PPL Electric [Member] | Regulated Deferred Income Taxes Reduction
Increase (decrease) due to: [Abstract]
State income tax rate change		274
PPL Electric [Member] | Deferred Tax Benefit
Increase (decrease) due to: [Abstract]
State income tax rate change		9
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		38		36	114	95
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		14		13	43	36
Depreciation and other items not normalized		(1)		0	(7)	(4)
Amortization of excess deferred income taxes		(4)		(5)	(9)	(11)
State income tax rate change		(9)		0	(9)	0
Other		(1)		1	(1)	0
Total increase (decrease)		(1)		9	17	21
Total income tax expense (benefit)		37		45	131	116
PPL Electric Utilities Corp [Member] | Regulated Deferred Income Taxes Reduction
Increase (decrease) due to: [Abstract]
State income tax rate change		274
PPL Electric Utilities Corp [Member] | Deferred Tax Benefit
Increase (decrease) due to: [Abstract]
State income tax rate change		9
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	57	53
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		4		4	11	10
Amortization of excess deferred income taxes		(3)		(7)	(17)	(13)
Other		(1)		(1)	(2)	(2)
Total increase (decrease)		0		(4)	(8)	(5)
Total income tax expense (benefit)		21		17	49	48
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate		25		26	70	63
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit		5		5	13	12
Amortization of excess deferred income taxes		(4)		(6)	(16)	(14)
Other		(2)		(2)	(4)	(4)
Total increase (decrease)		(1)		(3)	(7)	(6)
Total income tax expense (benefit)		$ 24		$ 23	$ 63	$ 57