Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 7,556	$ 7,701	$ 7,779
Licensed energy supplier [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,990	2,032	2,127
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,585	2,610	2,704
Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,185	1,257	1,233
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	582	621	624
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	484	495	489
Wholesale Municipal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20	43	118
Wholesale Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	40	49	79
Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	670	594	405
PPL Electric Utilities Corp [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,316	2,342	2,259
PPL Electric Utilities Corp [Member] | Licensed energy supplier [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
PPL Electric Utilities Corp [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,238	1,288	1,379
PPL Electric Utilities Corp [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	314	349	368
PPL Electric Utilities Corp [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	44	59	54
PPL Electric Utilities Corp [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	50	52	53
PPL Electric Utilities Corp [Member] | Wholesale Municipal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
PPL Electric Utilities Corp [Member] | Wholesale Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
PPL Electric Utilities Corp [Member] | Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	670	594	405
LG And E And KU Energy LLC [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,077	3,161	3,235
LG And E And KU Energy LLC [Member] | Licensed energy supplier [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
LG And E And KU Energy LLC [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,347	1,322	1,325
LG And E And KU Energy LLC [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	871	908	865
LG And E And KU Energy LLC [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	538	562	570
LG And E And KU Energy LLC [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	261	277	278
LG And E And KU Energy LLC [Member] | Wholesale Municipal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20	43	118
LG And E And KU Energy LLC [Member] | Wholesale Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	40	49	79
LG And E And KU Energy LLC [Member] | Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Kentucky Utilities Co [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,676	1,714	1,774
Kentucky Utilities Co [Member] | Licensed energy supplier [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Kentucky Utilities Co [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	671	654	659
Kentucky Utilities Co [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	427	442	410
Kentucky Utilities Co [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	365	382	390
Kentucky Utilities Co [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	147	156	149
Kentucky Utilities Co [Member] | Wholesale Municipal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20	43	118
Kentucky Utilities Co [Member] | Wholesale Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	46	37	48
Kentucky Utilities Co [Member] | Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 0	$ 0	$ 0