Goodwill and Other Intangible Assets (Other Intangibles) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Subject to amortization: [Abstract]
Gross carrying amount	$ 1,060		$ 996
Finite-Lived Intangible Assets, Accumulated Amortization	364		302
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	255		238
Gross carrying amount - other intangible assets	1,315		1,234
Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	16		18
Easements [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	239	[1]	220	[1]
Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	408	[2]	408	[2]
Finite-Lived Intangible Assets, Accumulated Amortization	202		150
Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	331		284
Finite-Lived Intangible Assets, Accumulated Amortization	117		113
Emission Allowances And Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Gross carrying amount	16	[3]	17	[3]
Finite-Lived Intangible Assets, Accumulated Amortization
Amortization expense	23		12		16
Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount	305	[4]	287	[4]
Finite-Lived Intangible Assets, Accumulated Amortization	45	[4]	39	[4]
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	61		61		112
Forecasted amortization in 2014	58
Forecasted amortization in 2015	60
Forecasted amortization in 2016	35
Forecasted amortization in 2017	17
Forecasted amortization in 2018	17
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	51		47		87
Forecasted amortization in 2014	48
Forecasted amortization in 2015	50
Forecasted amortization in 2016	27
Forecasted amortization in 2017	9
Forecasted amortization in 2018	9
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With No Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	10		14		25
Forecasted amortization in 2014	10
Forecasted amortization in 2015	10
Forecasted amortization in 2016	8
Forecasted amortization in 2017	8
Forecasted amortization in 2018	8
PPL Energy Supply LLC [Member]
Subject to amortization: [Abstract]
Gross carrying amount	323		307
Finite-Lived Intangible Assets, Accumulated Amortization	53		48
PPL Energy Supply LLC [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	17		17
Finite-Lived Intangible Assets, Accumulated Amortization	14		13
PPL Energy Supply LLC [Member] | Emission Allowances And Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Gross carrying amount	11	[3]	13	[3]
Finite-Lived Intangible Assets, Accumulated Amortization
Amortization expense	23		12		16
PPL Energy Supply LLC [Member] | Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount	295	[4]	277	[4]
Finite-Lived Intangible Assets, Accumulated Amortization	39	[4]	35	[4]
PPL Energy Supply LLC [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	5		9		20
PPL Electric Utilities Corp [Member]
Subject to amortization: [Abstract]
Gross carrying amount	298		253
Finite-Lived Intangible Assets, Accumulated Amortization	103		100
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount - other intangible assets	314		271
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	16		18
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	293		249
Finite-Lived Intangible Assets, Accumulated Amortization	102		99
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount	5		4
Finite-Lived Intangible Assets, Accumulated Amortization	1		1
LG And E And KU Energy LLC [Member]
Subject to amortization: [Abstract]
Gross carrying amount	419		417
Finite-Lived Intangible Assets, Accumulated Amortization	198		146
LG And E And KU Energy LLC [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	269	[5]	269	[5]
Finite-Lived Intangible Assets, Accumulated Amortization	171	[5]	128	[5]
LG And E And KU Energy LLC [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	20		18
Finite-Lived Intangible Assets, Accumulated Amortization	2		1
LG And E And KU Energy LLC [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	4	[6]	4	[6]
Finite-Lived Intangible Assets, Accumulated Amortization
LG And E And KU Energy LLC [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	126	[7]	126	[7]
Finite-Lived Intangible Assets, Accumulated Amortization	25		17
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	52		47		88
LG And E And KU Energy LLC [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	51		47		87
Forecasted amortization in 2014	48
Forecasted amortization in 2015	50
Forecasted amortization in 2016	27
Forecasted amortization in 2017	9
Forecasted amortization in 2018	9
LG And E And KU Energy LLC [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With No Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	1				1
Louisville Gas And Electric Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount	219		220
Finite-Lived Intangible Assets, Accumulated Amortization	99		76
Louisville Gas And Electric Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	124	[5]	124	[5]
Finite-Lived Intangible Assets, Accumulated Amortization	81	[5]	62	[5]
Louisville Gas And Electric Co [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	7		8
Finite-Lived Intangible Assets, Accumulated Amortization	1		1
Louisville Gas And Electric Co [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	1	[6]	1	[6]
Finite-Lived Intangible Assets, Accumulated Amortization
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	87	[7]	87	[7]
Finite-Lived Intangible Assets, Accumulated Amortization	17		13
Louisville Gas And Electric Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense	23		23		46
Louisville Gas And Electric Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	23		23		45
Forecasted amortization in 2014	23
Forecasted amortization in 2015	24
Forecasted amortization in 2016	13
Forecasted amortization in 2017	6
Forecasted amortization in 2018	6
Louisville Gas And Electric Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With No Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense					1
Kentucky Utilities Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount	200		197
Finite-Lived Intangible Assets, Accumulated Amortization	99		70
Kentucky Utilities Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	145	[5]	145	[5]
Finite-Lived Intangible Assets, Accumulated Amortization	90	[5]	66	[5]
Kentucky Utilities Co [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount	13		10
Finite-Lived Intangible Assets, Accumulated Amortization	1
Kentucky Utilities Co [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	3	[6]	3	[6]
Finite-Lived Intangible Assets, Accumulated Amortization
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	39	[7]	39	[7]
Finite-Lived Intangible Assets, Accumulated Amortization	8		4
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	28		24		42
Forecasted amortization in 2014	24
Forecasted amortization in 2015	26
Forecasted amortization in 2016	13
Forecasted amortization in 2017	3
Forecasted amortization in 2018	3
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With No Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense	$ 1

[1] Gross carrying amount includes $88 million, which represents the fair value at the acquisition date of easements recognized as a result of the 2011 acquisition of WPD Midlands. See Note 10 for additional information.

[2] Gross carrying amount includes the fair value at the acquisition date of coal contracts with terms favorable to market recognized as a result of the 2010 acquisition of LKE by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. This is referred to as "regulatory offset" in the tables below. See Note 6 for additional information.

[3] Emission allowances/RECs are expensed when consumed or sold; therefore, there is no accumulated amortization.

[4] "Other" includes costs for the development of licenses, the most significant of which is the COLA. Amortization of these costs begins when the related asset is placed in service. See Note 8 for additional information on the COLA.

[5] Gross carrying amount represents the fair value at the acquisition date of coal contracts with terms favorable to market recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to these contracts, which is being amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

[6] Represents the fair value at the acquisition date of emission allowances recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability is recorded related to these emission allowances, which is being amortized as the emission allowances are consumed, eliminating any income statement impact. Consumption related to these emission allowances was insignificant in 2013 and in 2012.

[7] Gross carrying amount represents the fair value at the acquisition date of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. See Note 6 for additional information.