Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 88	$ 110	$ 234	$ 235
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	11	8	24	21
Valuation allowance adjustments	7	7	13	14
Impact of lower U.K. income tax rates relative to U.S. income tax rates	(9)	(6)	(20)	(14)
Amortization of excess deferred income taxes	(12)	(10)	(23)	(21)
Interest benefit on U.K. financing entities	(3)	(3)	(5)	(6)
Kentucky recycling credit, net of federal income tax expense	0	(20)	0	(20)
Other	(8)	(2)	(9)	1
Total increase (decrease)	(14)	(26)	(20)	(25)
Total income tax expense (benefit)	74	84	214	210
Minimum [Member]
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			100
Maximum [Member]
Increase (decrease) due to: [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			110
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	33	26	67	61
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	12	10	25	23
Depreciation and other items not normalized	(2)	(1)	(4)	(3)
Amortization of excess deferred income taxes	(5)	(4)	(8)	(8)
Other	2	1	1	1
Total increase (decrease)	7	6	14	13
Total income tax expense (benefit)	40	32	81	74
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	21	23	56	56
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4	11	10
Valuation allowance adjustments	0	3	0	3
Amortization of excess deferred income taxes	(6)	(6)	(13)	(12)
Kentucky recycling credit, net of federal income tax expense	0	(20)	0	(20)
Other	(2)	(1)	(3)	(2)
Total increase (decrease)	(4)	(20)	(5)	(21)
Total income tax expense (benefit)	17	3	51	35
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	29
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	2	2	6	5
Valuation allowance adjustments	0	15	0	15
Amortization of excess deferred income taxes	(2)	(2)	(5)	(5)
Kentucky recycling credit, net of federal income tax expense	0	(15)	0	(15)
Other	0	0	(2)	0
Total increase (decrease)	0	0	(1)	0
Total income tax expense (benefit)	12	12	31	29
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	13	16	34	37
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	3	3	6	7
Valuation allowance adjustments	0	5	0	5
Amortization of excess deferred income taxes	(4)	(4)	(8)	(7)
Kentucky recycling credit, net of federal income tax expense	0	(5)	0	(5)
Other	(1)	(1)	(1)	(1)
Total increase (decrease)	(2)	(2)	(3)	(1)
Total income tax expense (benefit)	$ 11	$ 14	$ 31	$ 36