Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ (40)	$ 41	$ 15	$ 96
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	(18)	11	(5)	24
Depreciation and other items not normalized	(2)	(2)	(4)	(4)
Valuation allowance adjustments	26	6	34	12
Amortization of excess deferred income taxes	(8)	(12)	(20)	(23)
Other	4	(2)	1	(1)
Total increase (decrease)	385	(1)	389	5
Total income tax expense (benefit)	345	40	404	101
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	383	(2)	383	(3)
Deferred Tax Assets, Valuation Allowance	25		25
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, U.K. Finance Act 2021, Amount			383
Domestic Tax Authority [Member]
Increase (decrease) due to: [Abstract]
Net Operating Loss Carryforwards, Used During the Period			1,111
Deferred Tax Assets, Operating Loss Carryforwards, Adjustment, Domestic	506		506
Domestic Tax Authority [Member] | Investment Tax Credit Carryforward [Member]
Increase (decrease) due to: [Abstract]
Deferred Tax Assets, Tax Credit Carryforwards, Used during the period			272
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	27	33	59	67
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	10	12	22	25
Depreciation and other items not normalized	(2)	(2)	(4)	(4)
Amortization of excess deferred income taxes	(3)	(5)	(6)	(8)
Other	2	2	0	1
Total increase (decrease)	7	7	12	14
Total income tax expense (benefit)	34	40	71	81
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	12	12	32	32
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	2	2	6	6
Amortization of excess deferred income taxes	(3)	(2)	(6)	(5)
Other	1	0	(1)	(2)
Total increase (decrease)	0	0	(1)	(1)
Total income tax expense (benefit)	12	12	31	31
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	15	13	37	34
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	3	3	7	6
Amortization of excess deferred income taxes	(4)	(4)	(8)	(8)
Other	(1)	(1)	(2)	(1)
Total increase (decrease)	(2)	(2)	(3)	(3)
Total income tax expense (benefit)	$ 13	$ 11	$ 34	$ 31