Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2021	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	$ 1,739	$ 1,803	$ 3,793	$ 3,882
Alternative Revenue Programs	(8)	(20)	(11)	(26)
Other Revenue	(7)	(10)	(17)	(19)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	1,724	1,773	3,765	3,837
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	7	2	15	11
Contract with Customer, Liability	37	47	37	47		$ 44	$ 42
Contract with Customer, Liability, Revenue Recognized			28	29
Licensed energy suppliers [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	449	510	1,032	1,066
Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	583	572	1,297	1,350
Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	274	302	586	621
Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	134	156	278	306
Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	108	117	224	232
Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	3	4	8	32
Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	9	11	17	24
Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	164	101	323	206
Pennsylvania Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	554	521	1,162	1,166
United Kingdom Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	476	541	1,090	1,124
Kentucky Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	700	732	1,525	1,577
Corporate and Other [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	9	9	16	15
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	30		30
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-06-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount					$ 29
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	554	521	1,162	1,166
Alternative Revenue Programs	(1)	(2)	(1)	(6)
Other Revenue	(1)	(2)	(3)	(5)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	552	517	1,158	1,155
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	5	0	9	6
Contract with Customer, Liability	16	22	16	22		21	23
Contract with Customer, Liability, Revenue Recognized			9	11
PPL Electric Utilities Corp [Member] | Licensed energy suppliers [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
PPL Electric Utilities Corp [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	290	301	634	708
PPL Electric Utilities Corp [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	74	87	155	182
PPL Electric Utilities Corp [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	12	15	20	32
PPL Electric Utilities Corp [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	12	13	26	27
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] | Distribution [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	388	416	835	949
PPL Electric Utilities Corp [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	164	101	323	206
LG And E And KU Energy LLC [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	700	732	1,525	1,577
Alternative Revenue Programs	(7)	(18)	(10)	(20)
Other Revenue	(4)	(6)	(10)	(10)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	689	708	1,505	1,547
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	1	3	3
Contract with Customer, Liability	9	9	9	9		9	9
Contract with Customer, Liability, Revenue Recognized			9	9
LG And E And KU Energy LLC [Member] | Licensed energy suppliers [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
LG And E And KU Energy LLC [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	293	271	663	642
LG And E And KU Energy LLC [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	200	215	431	439
LG And E And KU Energy LLC [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	122	141	258	274
LG And E And KU Energy LLC [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	62	66	128	136
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	3	4	8	32
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	9	11	17	24
LG And E And KU Energy LLC [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
Louisville Gas And Electric Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	322	334	729	744
Alternative Revenue Programs	(1)	(3)	(4)	(5)
Other Revenue	(1)	(3)	(4)	(4)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	320	328	721	735
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	0	1	1
Contract with Customer, Liability	4	5	4	5		5	5
Contract with Customer, Liability, Revenue Recognized			5	5
Louisville Gas And Electric Co [Member] | Licensed energy suppliers [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
Louisville Gas And Electric Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	149	138	336	327
Louisville Gas And Electric Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	100	108	224	229
Louisville Gas And Electric Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	38	43	83	87
Louisville Gas And Electric Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	28	29	56	62
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	5	10	22	30
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	388	406	820	856
Alternative Revenue Programs	(6)	(15)	(6)	(15)
Other Revenue	(3)	(3)	(6)	(6)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	379	388	808	835
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	1	2	2
Contract with Customer, Liability	5	4	5	4		$ 4	$ 4
Contract with Customer, Liability, Revenue Recognized			4	4
Kentucky Utilities Co [Member] | Licensed energy suppliers [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0	0	0
Kentucky Utilities Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	144	133	327	315
Kentucky Utilities Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	100	107	207	210
Kentucky Utilities Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	84	98	175	187
Kentucky Utilities Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	34	37	72	74
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	3	4	8	32
Kentucky Utilities Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	14	9	19	17
Kentucky Utilities Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	$ 0	$ 0	$ 0	$ 0