Utility Rate Regulation (Regulatory Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Current Regulatory Assets	$ 64	$ 99
Noncurrent Regulatory Assets	1,236	1,262
Defined benefit plans [Member]
Regulatory Assets [Line Items]
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period	98	79
Plant outage costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	46
Noncurrent Regulatory Assets	54	0
Gas Supply Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	21	4
Smart meter rider [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	11	17
Transmission Formula Rate [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	6	15
Storm costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	7
Noncurrent Regulatory Assets	11	17
Other [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	15	10
Noncurrent Regulatory Assets	6	7
Defined benefit plans [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	523	570
Unamortized loss on debt [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	24	30
Interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	18	23
Terminated interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	70	75
Accumulated cost of removal of utility plant [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	228	240
AROs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	302	300
Fuel Adjustment Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	11	0
PPL Electric Utilities Corp [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	22	40
Noncurrent Regulatory Assets	488	541
PPL Electric Utilities Corp [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Noncurrent Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Gas Supply Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Smart meter rider [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	11	17
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	6	15
PPL Electric Utilities Corp [Member] | Storm costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	7
Noncurrent Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Other [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	5	1
Noncurrent Regulatory Assets	0	3
PPL Electric Utilities Corp [Member] | Defined benefit plans [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	256	290
PPL Electric Utilities Corp [Member] | Unamortized loss on debt [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	4	8
PPL Electric Utilities Corp [Member] | Interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Terminated interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Accumulated cost of removal of utility plant [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	228	240
PPL Electric Utilities Corp [Member] | AROs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	0	0
PPL Electric Utilities Corp [Member] | Fuel Adjustment Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Louisville Gas And Electric Co [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	33	23
Noncurrent Regulatory Assets	337	351
Louisville Gas And Electric Co [Member] | Defined benefit plans [Member]
Regulatory Assets [Line Items]
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period	54	44
Louisville Gas And Electric Co [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	12
Noncurrent Regulatory Assets	15	0
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	21	4
Louisville Gas And Electric Co [Member] | Gas Line Tracker [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	3	4
Louisville Gas And Electric Co [Member] | Storm costs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	8	11
Louisville Gas And Electric Co [Member] | Generation formula rate
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Louisville Gas And Electric Co [Member] | Other [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	5	3
Noncurrent Regulatory Assets	4	1
Louisville Gas And Electric Co [Member] | Defined benefit plans [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	164	174
Louisville Gas And Electric Co [Member] | Unamortized loss on debt [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	12	13
Louisville Gas And Electric Co [Member] | Interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	18	23
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	41	44
Louisville Gas And Electric Co [Member] | AROs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	75	85
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	4	0
Kentucky Utilities Co [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	9	36
Noncurrent Regulatory Assets	411	370
Kentucky Utilities Co [Member] | Defined benefit plans [Member]
Regulatory Assets [Line Items]
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period	44	35
Kentucky Utilities Co [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	34
Noncurrent Regulatory Assets	39	0
Kentucky Utilities Co [Member] | Gas Supply Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Kentucky Utilities Co [Member] | Gas Line Tracker [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Kentucky Utilities Co [Member] | Storm costs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	3	6
Kentucky Utilities Co [Member] | Generation formula rate
Regulatory Assets [Line Items]
Current Regulatory Assets	2	2
Kentucky Utilities Co [Member] | Other [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	0	0
Noncurrent Regulatory Assets	2	3
Kentucky Utilities Co [Member] | Defined benefit plans [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	103	106
Kentucky Utilities Co [Member] | Unamortized loss on debt [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	8	9
Kentucky Utilities Co [Member] | Interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	0	0
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	29	31
Kentucky Utilities Co [Member] | AROs [Member]
Regulatory Assets [Line Items]
Noncurrent Regulatory Assets	227	215
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member]
Regulatory Assets [Line Items]
Current Regulatory Assets	$ 7	$ 0