Goodwill and Other Intangible Assets (Other Intangibles) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subject to amortization: [Abstract]
Gross carrying amount		$ 775	$ 759
Accumulated amortization		442	416
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		367	336
Gross carrying amount - other intangible assets		1,142	1,095
Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		19	33
Easements [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount	[1]	348	303
Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[2]	405	407
Accumulated amortization	[2]	325	300
Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		362	337
Accumulated amortization		115	111
Emission Allowances And Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[3]	2	5
Accumulated amortization		0	0
Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount		6	10
Accumulated amortization		2	5
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense		30	57	$ 53
Forecasted amortization in 2017		15
Forecasted amortization in 2018		15
Forecasted amortization in 2019		15
Forecasted amortization in 2020		14
Forecasted amortization in 2021		14
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 2017		6
Forecasted amortization in 2018		6
Forecasted amortization in 2019		6
Forecasted amortization in 2020		6
Forecasted amortization in 2021		6
Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense		24	51	47
Forecasted amortization in 2017		9
Forecasted amortization in 2018		9
Forecasted amortization in 2019		9
Forecasted amortization in 2020		8
Forecasted amortization in 2021		8
PPL Electric Utilities Corp [Member]
Subject to amortization: [Abstract]
Gross carrying amount		344	320
Accumulated amortization		113	109
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount - other intangible assets		364	353
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Not subject to amortization due to indefinite life: [Line Items]
Gross carrying amount		20	33
PPL Electric Utilities Corp [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		341	316
Accumulated amortization		112	108
PPL Electric Utilities Corp [Member] | Licenses And Other [Member]
Subject to amortization: [Abstract]
Gross carrying amount		3	4
Accumulated amortization		1	1
LG And E And KU Energy LLC [Member]
Subject to amortization: [Abstract]
Gross carrying amount		416	419
Accumulated amortization		321	296
LG And E And KU Energy LLC [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[4]	269	269
Accumulated amortization	[4]	269	252
LG And E And KU Energy LLC [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		21	21
Accumulated amortization		3	2
LG And E And KU Energy LLC [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[5]	0	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	[6]	126	126
Accumulated amortization	[6]	49	42
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		25	51	47
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	0	0
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		24	51	47
Forecasted amortization in 2017		9
Forecasted amortization in 2018		9
Forecasted amortization in 2019		9
Forecasted amortization in 2020		8
Forecasted amortization in 2021		8
Louisville Gas And Electric Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount		218	219
Accumulated amortization		159	146
Louisville Gas And Electric Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[7]	124	124
Accumulated amortization	[7]	124	116
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	[8]	0	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	[9]	87	87
Accumulated amortization	[9]	34	29
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		13	24	23
Forecasted amortization in 2017		6
Forecasted amortization in 2018		6
Forecasted amortization in 2019		6
Forecasted amortization in 2020		6
Forecasted amortization in 2021		6
Kentucky Utilities Co [Member]
Subject to amortization: [Abstract]
Gross carrying amount		198	200
Accumulated amortization		162	150
Kentucky Utilities Co [Member] | Coal Contracts [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[10]	145	145
Accumulated amortization	[10]	145	136
Kentucky Utilities Co [Member] | Land And Transmission Rights [Member]
Subject to amortization: [Abstract]
Gross carrying amount		14	14
Accumulated amortization		2	1
Kentucky Utilities Co [Member] | Emission Allowances [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[11]	0	2
Accumulated amortization		0	0
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation Power Purchase Agreement [Member]
Subject to amortization: [Abstract]
Gross carrying amount	[12]	39	39
Accumulated amortization	[12]	15	13
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits [Member]
Subject to amortization: [Abstract]
Amortization expense		12	27	24
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	0	0
Kentucky Utilities Co [Member] | Other Intangibles Excluding Emission Allowances And Or Renewable Energy Credits With Regulatory Offset [Member]
Subject to amortization: [Abstract]
Amortization expense		11	$ 27	$ 24
Forecasted amortization in 2017		3
Forecasted amortization in 2018		3
Forecasted amortization in 2019		3
Forecasted amortization in 2020		2
Forecasted amortization in 2021		$ 2

[1] The increase during 2016 was primarily from increases 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 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 was amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

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

[6] 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. 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 information.

[7] 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 was amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

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

[9] 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. 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 information.

[10] 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 was amortized over the same period as the intangible assets, eliminating any income statement impact. See Note 6 for additional information.

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

[12] 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. 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 information.