Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2022	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	$ 1,288	$ 1,263	$ 2,786	$ 2,703
Alternative Revenue Programs	19	(8)	43	(11)
Other Revenue	(5)	(5)	(11)	(13)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	1,302	1,250	2,818	2,679
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	6	2	12
Contract with Customer, Liability	31	30	31	30		$ 40	$ 37
Contract with Customer, Liability, Revenue Recognized			24	21
Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	567	583	1,341	1,297
Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	297	274	610	586
Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	154	134	306	278
Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	93	83	184	170
Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	5	3	11	8
Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	13	9	33	17
Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	173	164	333	323
PPL Electric [Member]
Contract with Customer, Asset and Liability [Abstract]
Revenue Reserve for ROE Challenge	24		51
Pennsylvania Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	537	554	1,142	1,162
Kentucky Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	741	700	1,626	1,525
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	731	689	1,612	1,505
Corporate and Other [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	10	9	18	16
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	48		48
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount					$ 42
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period					12 months
PPL Electric Utilities Corp [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	537	554	1,142	1,162
Alternative Revenue Programs	24	(1)	46	(1)
Other Revenue	0	(1)	0	(3)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	561	552	1,188	1,158
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	5	1	9
Contract with Customer, Liability	16	16	16	16		23	21
Contract with Customer, Liability, Revenue Recognized			11	9
Revenue Reserve for ROE Challenge	24		51
PPL Electric Utilities Corp [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	279	290	640	634
PPL Electric Utilities Corp [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	83	74	165	155
PPL Electric Utilities Corp [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	13	12	25	20
PPL Electric Utilities Corp [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	13	12	25	26
PPL Electric Utilities Corp [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
PPL Electric Utilities Corp [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
PPL Electric Utilities Corp [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	173	164	333	323
Louisville Gas And Electric Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	342	322	770	729
Alternative Revenue Programs	(1)	(1)	(1)	(4)
Other Revenue	(2)	(1)	(5)	(4)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	339	320	764	721
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	0	0	1
Contract with Customer, Liability	5	4	5	4		5	5
Contract with Customer, Liability, Revenue Recognized			5	5
Louisville Gas And Electric Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	144	149	349	336
Louisville Gas And Electric Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	107	100	228	224
Louisville Gas And Electric Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	43	38	89	83
Louisville Gas And Electric Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	31	28	65	56
Louisville Gas And Electric Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
Louisville Gas And Electric Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	14	5	33	22
Louisville Gas And Electric Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
Kentucky Utilities Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	411	388	880	820
Alternative Revenue Programs	(4)	(6)	(2)	(6)
Other Revenue	(3)	(3)	(6)	(6)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	404	379	872	808
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	1	1	2
Contract with Customer, Liability	5	5	5	5		$ 6	$ 4
Contract with Customer, Liability, Revenue Recognized			6	4
Kentucky Utilities Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	144	144	352	327
Kentucky Utilities Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	107	100	217	207
Kentucky Utilities Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	98	84	192	175
Kentucky Utilities Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	39	34	76	72
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	5	3	11	8
Kentucky Utilities Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	11	14	24	19
Kentucky Utilities Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	$ 0	$ 0	$ 0	$ 0