Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2022	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	$ 1,512	$ 1,400	$ 4,298	$ 4,103
Alternative Revenue Programs	19	(1)	62	(12)
Other Revenue	(4)	(4)	(15)	(17)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	1,527	1,395	4,345	4,074
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	7	7	9	19
Contract with Customer, Liability	37	32	37	32		$ 40	$ 37
Contract with Customer, Liability, Revenue Recognized			24	21
Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	684	651	2,025	1,948
Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	345	310	955	896
Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	168	156	474	434
Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	100	86	284	256
Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	7	7	18	15
Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	20	11	53	28
Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	203	174	536	497
PPL Electric [Member]
Contract with Customer, Asset and Liability [Abstract]
Revenue Reserve for ROE Challenge	13		64
Pennsylvania Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	627	586	1,769	1,748
Kentucky Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	879	806	2,505	2,331
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	872	806	2,484	2,311
Corporate and Other [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	6	8	24	24
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-30
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]: 2021-09-30
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	627	586	1,769	1,748
Alternative Revenue Programs	22	(5)	68	(6)
Other Revenue	0	0	0	(3)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	649	581	1,837	1,739
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	3	3	4	12
Contract with Customer, Liability	21	18	21	18		23	21
Contract with Customer, Liability, Revenue Recognized			11	9
Revenue Reserve for ROE Challenge	13		64
PPL Electric Utilities Corp [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	324	303	964	937
PPL Electric Utilities Corp [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	95	79	260	234
PPL Electric Utilities Corp [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	14	13	39	33
PPL Electric Utilities Corp [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	13	12	38	38
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	203	174	536	497
Louisville Gas And Electric Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	395	363	1,165	1,092
Alternative Revenue Programs	(1)	2	(2)	(2)
Other Revenue	(2)	(2)	(7)	(6)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	392	363	1,156	1,084
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	3	1	4
Contract with Customer, Liability	6	5	6	5		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	180	173	529	509
Louisville Gas And Electric Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	123	112	351	336
Louisville Gas And Electric Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	46	47	135	130
Louisville Gas And Electric Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	37	28	102	84
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	6	3	39	25
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	494	452	1,374	1,272
Alternative Revenue Programs	(2)	2	(4)	(4)
Other Revenue	(2)	(2)	(8)	(8)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	490	452	1,362	1,260
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	3	1	4	3
Contract with Customer, Liability	6	4	6	4		$ 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	180	175	532	502
Kentucky Utilities Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	127	119	344	326
Kentucky Utilities Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	108	96	300	271
Kentucky Utilities Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	44	38	120	110
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	7	7	18	15
Kentucky Utilities Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	24	17	48	36
Kentucky Utilities Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	$ 0	$ 0	$ 0	$ 0