Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subject to amortization: [Abstract]
Gross carrying amount		$ 759	$ 752
Accumulated amortization		416	363
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		336	279
Gross carrying amount - other intangible assets		1,095	1,031
Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		33	29
Easements [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	[1]	303	250
Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[2]	407	408
Accumulated amortization	[2]	300	250
Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		337	329
Accumulated amortization		111	108
Emission Allowances And Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[3]	5	5
Accumulated amortization		0	0
Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount		10	10
Accumulated amortization		5	5
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense		57	53	$ 57
Forecasted amortization in 2016		33
Forecasted amortization in 2017		15
Forecasted amortization in 2018		15
Forecasted amortization in 2019		15
Forecasted amortization in 2020		14
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense		51	47	51
Forecasted amortization in 2016		27
Forecasted amortization in 2017		9
Forecasted amortization in 2018		9
Forecasted amortization in 2019		9
Forecasted amortization in 2020		8
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With No Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense		6	6	6
Forecasted amortization in 2016		6
Forecasted amortization in 2017		6
Forecasted amortization in 2018		6
Forecasted amortization in 2019		6
Forecasted amortization in 2020		6
PPL Electric Utilities Corp [Member]
Subject to amortization: [Abstract]
Gross carrying amount		320	312
Accumulated amortization		109	106
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount - other intangible assets		353	341
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		33	29
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		316	308
Accumulated amortization		108	105
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount		4	4
Accumulated amortization		1	1
LG And E And KU Energy LLC [Member]
Subject to amortization: [Abstract]
Gross carrying amount		419	419
Accumulated amortization		296	245
LG And E And KU Energy LLC [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[4]	269	269
Accumulated amortization	[4]	252	210
LG And E And KU Energy LLC [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		21	21
Accumulated amortization		2	2
LG And E And KU Energy LLC [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[3]	3	3
Accumulated amortization		0	0
LG And E And KU Energy LLC [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[5]	126	126
Accumulated amortization	[5]	42	33
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		51	47	52
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	51
Forecasted amortization in 2016		27
Forecasted amortization in 2017		9
Forecasted amortization in 2018		9
Forecasted amortization in 2019		9
Forecasted amortization in 2020		8
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		0	0	1
Louisville Gas And Electric Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount		219	219
Accumulated amortization		146	122
Louisville Gas And Electric Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[4]	124	124
Accumulated amortization	[4]	116	98
Louisville Gas And Electric Co [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		7	7
Accumulated amortization		1	1
Louisville Gas And Electric Co [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[6]	1	1
Accumulated amortization		0	0
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[5]	87	87
Accumulated amortization	[5]	29	23
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		24	23	23
Forecasted amortization in 2016		14
Forecasted amortization in 2017		6
Forecasted amortization in 2018		6
Forecasted amortization in 2019		6
Forecasted amortization in 2020		6
Kentucky Utilities Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount		200	200
Accumulated amortization		150	123
Kentucky Utilities Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[4]	145	145
Accumulated amortization	[4]	136	112
Kentucky Utilities Co [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		14	14
Accumulated amortization		1	1
Kentucky Utilities Co [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[3]	2	2
Accumulated amortization		0	0
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[5]	39	39
Accumulated amortization	[5]	13	10
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense		27	24	29
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense		27	24	28
Forecasted amortization in 2016		13
Forecasted amortization in 2017		3
Forecasted amortization in 2018		3
Forecasted amortization in 2019		3
Forecasted amortization in 2020		2
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		$ 0	$ 0	$ 1

[1] Primarily from an increase in easements at WPD.

[2] Gross carrying amount includes the fair value at the acquisition date of the OVEC power purchase contract and coal contracts with terms favorable to market recognized as a result of the 2010 acquisition of LKE by PPL. Offsetting regulatory liabilities were recorded related to these contracts, which are 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] Gross carrying amount r epresents 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.

[5] Gross carrying amount r epresents the fair value at the acquisition date of the OVEC power purchase contract recognized as a result of the 2010 acquisition by PPL. An offsetting regulatory liability was recorded related to this contract, which is being amortized over the same period as the intangible asset, eliminating any income statement impact. See Note 6 for additional inf ormation.

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