Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subject to amortization: [Abstract]
Gross carrying amount	$ 576	$ 528
Accumulated amortization	204	190
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	345	359
Gross carrying amount - other intangible assets	921	887
Land Rights and Easements [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	339	359
Other [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	6	0
Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	137	138
Accumulated amortization	75	67
Land Rights And Easements [Member]
Subject to amortization: [Abstract]
Gross carrying amount	418	382
Accumulated amortization	128	120
Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount	21	8
Accumulated amortization	1	3
Intangible assets with no regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	7	6	$ 6
Forecasted amortization in 2019	7
Forecasted amortization in 2020	7
Forecasted amortization in 2021	7
Forecasted amortization in 2022	7
Forecasted amortization in 2023	7
Intangible assets with regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	8	9	24
Forecasted amortization in 2019	9
Forecasted amortization in 2020	8
Forecasted amortization in 2021	8
Forecasted amortization in 2022	8
Forecasted amortization in 2023	8
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	15	15	30
Forecasted amortization in 2019	16
Forecasted amortization in 2020	15
Forecasted amortization in 2021	15
Forecasted amortization in 2022	15
Forecasted amortization in 2023	15
PPL Electric Utilities Corp [Member]
Subject to amortization: [Abstract]
Gross carrying amount	365	364
Accumulated amortization	122	118
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount - other intangible assets	382	377
PPL Electric Utilities Corp [Member] | Land Rights and Easements [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	17	13
PPL Electric Utilities Corp [Member] | Land Rights And Easements [Member]
Subject to amortization: [Abstract]
Gross carrying amount	363	361
Accumulated amortization	121	117
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount	2	3
Accumulated amortization	1	1
LG And E And KU Energy LLC [Member]
Subject to amortization: [Abstract]
Gross carrying amount	147	147
Accumulated amortization	69	61
LG And E And KU Energy LLC [Member] | Land Rights And Easements [Member]
Subject to amortization: [Abstract]
Gross carrying amount	21	21
Accumulated amortization	3	3
LG And E And KU Energy LLC [Member] | OVEC power purchase agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	126	126
Accumulated amortization	66	58
LG And E And KU Energy LLC [Member] | Intangible assets with no regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	0	0	1
LG And E And KU Energy LLC [Member] | Intangible assets with regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	8	9	24
Forecasted amortization in 2019	9
Forecasted amortization in 2020	8
Forecasted amortization in 2021	8
Forecasted amortization in 2022	8
Forecasted amortization in 2023	8
LG And E And KU Energy LLC [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	8	9	25
Louisville Gas And Electric Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount	94	94
Accumulated amortization	47	41
Louisville Gas And Electric Co [Member] | Land Rights And Easements [Member]
Subject to amortization: [Abstract]
Gross carrying amount	7	7
Accumulated amortization	1	1
Louisville Gas And Electric Co [Member] | OVEC power purchase agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	87	87
Accumulated amortization	46	40
Louisville Gas And Electric Co [Member] | Intangible assets with regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	6	6	13
Forecasted amortization in 2019	6
Forecasted amortization in 2020	6
Forecasted amortization in 2021	6
Forecasted amortization in 2022	6
Forecasted amortization in 2023	6
Kentucky Utilities Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount	53	53
Accumulated amortization	22	20
Kentucky Utilities Co [Member] | Land Rights And Easements [Member]
Subject to amortization: [Abstract]
Gross carrying amount	14	14
Accumulated amortization	2	2
Kentucky Utilities Co [Member] | OVEC power purchase agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	39	39
Accumulated amortization	20	18
Kentucky Utilities Co [Member] | Intangible assets with no regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	0	0	1
Kentucky Utilities Co [Member] | Intangible assets with regulatory offset [Member]
Subject to amortization: [Abstract]
Amortization expense	2	3	11
Forecasted amortization in 2019	3
Forecasted amortization in 2020	2
Forecasted amortization in 2021	2
Forecasted amortization in 2022	2
Forecasted amortization in 2023	2
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	$ 2	$ 3	$ 12