Acquisitions, Development and Divestures (Details) $ in Millions		1 Months Ended				3 Months Ended																7 Months Ended	12 Months Ended
		Jun. 30, 2015 USD ($) Integer	Mar. 31, 2015 Integer	Nov. 30, 2014 USD ($) Integer MW	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) Integer		Sep. 30, 2015 USD ($) Integer		Jun. 30, 2015 USD ($) Integer		Mar. 31, 2015 USD ($)	[1],[2]	Dec. 31, 2014 USD ($)		Sep. 30, 2014 USD ($)	[1],[2]	Jun. 30, 2014 USD ($)	[1],[2]	Mar. 31, 2014 USD ($)	[1],[2]	Dec. 31, 2015 USD ($) Integer	Dec. 31, 2015 USD ($) kV Integer mi MW	Dec. 31, 2014 USD ($) Integer	Dec. 31, 2013 USD ($)	Jun. 01, 2015 USD ($)
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																							$ 428	$ 666	$ 387
Continuing Involvement (Details) [Abstract]
Energy purchases																							855	924	856
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Income tax expense (benefit)																							(30)	198	(180)
Income (Loss) from Discontinued Operations						$ (6)	[1]	$ (3)	[1]	$ (1,007)	[1],[2],[3]	$ 95		$ 287	[1],[2],[4]	$ 87		$ (1)		$ (73)			(921)	300	(238)
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Total Current Assets						0								2,592								$ 0	0	2,592
Total Noncurrent Assets						0								8,311								0	0	8,311
Total Current Liabilities						0								2,771								0	0	2,771
Total Noncurrent Liabilities						0								3,953								0	0	3,953
Development Projects [Abstract]
Construction work in progress						1,315								2,532								1,315	$ 1,315	2,532
Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi																							150
Capacity (in kilovolts) of a transmission line | kV																							500
Project costs capitalized						$ 648								597								$ 648	$ 648	597
Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi																							58
Capacity (in kilovolts) of a transmission line | kV																							230
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer						100																100	100
Expected capital cost of an expansion project						$ 335																$ 335	$ 335
Number of new substations included in request | Integer						3																3	3
Capitalized costs						$ 319								183								$ 319	$ 319	183
Spinoff [Member] | PPL Energy Supply Spinoff [Member]
Divestitures - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Separation benefits																							10	$ 36
Number of employees impacted | Integer																								306
Amount of accrued liability for seperation benefits						13								20								13	13	$ 20
Third-party costs																							45	27
Spinoff [Member] | PPL Energy Supply Spinoff [Member] | Other Operation Maintenance [Member]
Divestitures - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Separation benefits																							8	20
Consulting and other costs																							13	8
Spinoff [Member] | PPL Energy Supply Spinoff [Member] | Discontinued Operations [Member]
Divestitures - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Separation benefits																							2	$ 16
Number of employees impacted | Integer																								112
Amount of accrued liability for seperation benefits																										$ 24
Bank advisory, legal and accounting fees																							$ 32	$ 19
PPL Energy Supply Spinoff [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Spinoff agreement execution date		Jun. 09, 2014
Date of record		May 20, 2015
Effective date of spinoff		Jun. 01, 2015
Certain details of spinoff transaction																							In June 2014, PPL and PPL Energy Supply executed definitive agreements with affiliates of Riverstone to spin off PPL Energy Supply and immediately combine it with Riverstone’s competitive power generation businesses to form a new, stand-alone, publicly traded company named Talen Energy. The transaction was subject to customary closing conditions, including receipt of regulatory approvals from the NRC, FERC, DOJ and PUC, all of which were received by mid-April 2015. On April 29, 2015, PPL’s Board of Directors declared the June 1, 2015 distribution to PPL’s shareowners of record on May 20, 2015 of a newly formed entity, Holdco, which at closing owned all of the membership interests of PPL Energy Supply and all of the common stock of Talen Energy.
Number of shares of Talen common stock for one share of PPL common stock		0.1249
Initial percent ownership in new company, Talen Energy, by PPL shareowners																										65.00%
Initial percent ownership in new company, Talen Energy, by Riverstone Holdings, LLC																										35.00%
Number of approaches | Integer		3
Weighted fair value																										$ 3,205
Number of market approaches | Integer		2
Carrying value of the Supply segment																										4,100
Gain (loss) on interest rate swaps recognized in discontinued operations on the statement of income		$ (72)
Gain (loss), after-tax, on interest rate swaps recognized in discontinued operations on the statement of income		$ (42)
Deferred income tax recorded as result of agreement to adjust valuation allowances																								50
Continuing Involvement (Details) [Abstract]
Maximum period for Transition Service Agreement (in years)		2 years
Amount for services billed to spinoff																							$ 25
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Operating revenues																							1,427	3,848	4,648
Operating expenses																							1,328	3,410	4,173
Other Income (Expense) - net																							(21)	13	32
Interest expense	[5]																						150	190	228
Gain on sale of Montana																							0	237	0
Loss on lease termination																							0	0	0
Income tax expense (benefit)																							(30)	198	(180)
Gain (loss) on disposal group										$ 879													(879)	0	0
Income (Loss) from Discontinued Operations																							$ (921)	300	(238)
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Cash and cash equivalents	[6]													352										352		371
Restricted cash and cash equivalents														176										176		156
Accounts receivable and unbilled revenues														504										504		334
Fuels, materials and supplies														455										455		415
Price risk management assets														1,079										1,079		784
Other current assets														26										26		46
Total Current Assets														2,592										2,592		2,106
Investments														980										980		999
Property, plant and equipment, net														6,428										6,428		6,384
Goodwill														338										338		338
Other intangibles														257										257		260
Price risk management assets														239										239		244
Other noncurrent assets														69										69		63
Total Noncurrent Assets														8,311										8,311		8,288
Total assets														10,903										10,903		10,394
Short-term debt and long-term debt due within one year														1,165										1,165		885
Accounts payable														361										361		252
Price risk management liabilities														1,024										1,024		763
Other current liabilities														221										221		229
Total Current Liabilities														2,771										2,771		2,129
Long-term debt (excluding current portion)														1,677										1,677		1,917
Deferred income taxes														1,219										1,219		1,246
Price risk management liabilities														193										193		206
Accrued pension obligations														299										299		266
Asset retirement obligations														415										415		443
Other deferred credits and noncurrent liabilities														150										150		103
Total Noncurrent Liabilities														3,953										3,953		4,181
Total liabilities														6,724										6,724		6,310
Adjustment for loss on spinoff																										879
Net assets distributed																										3,205
PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases																						27
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Weighting		50.00%
Weighted fair value																										1,400
Midpoint of premiums received in market sales transactions reviewed		25.00%
Control Premium		25.00%
Review period used in determing the control premium (in years)		5 years
Minimum transaction value reviewed in determining the control premium		$ 1,000
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Net assets distributed																										1,400
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member] | Minimum [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Control Premium		5.00%
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member] | Maximum [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Control Premium		42.00%
PPL Energy Supply Spinoff [Member] | Income Discounted Cash Flow [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Weighting		30.00%
Weighted fair value																										1,100
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Net assets distributed																										1,100
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Weighting		20.00%
Weighted fair value																										700
Midpoint of premiums received in market sales transactions reviewed		25.00%
Control Premium		25.00%
Review period used in determing the control premium (in years)		5 years
Minimum transaction value reviewed in determining the control premium		$ 1,000
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Net assets distributed																										$ 700
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member] | Minimum [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Control Premium		5.00%
PPL Energy Supply Spinoff [Member] | Alternative Market Comparable Company [Member] | Maximum [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Control Premium		42.00%
Montana Hydroelectric Generating Facilities [Member]
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Gain (loss) on disposal group				$ 137										137
Divestitures - Montana Hydro Sale (Numeric) [Abstract]
Capacity of facilities sold (in MW) | MW				633
Agreed upon sales price for disposal of hydroelectric facilities owned by PPL Montana				$ 900
Number of hydroelectric facilities owned by PPL Montana sold | Integer				11
Payment on lease termination					$ 271
Loss on sale-leaseback termination, after-tax					$ 413
LGE [Member]
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer			1							2
Costs associated with the retirement of generating units								$ 11
LGE [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						30																30	$ 30
KU [Member]
Development Projects [Abstract]
Generating units retired at the Green River plant | Integer								2
Costs associated with the retirement of generating units								$ 6
KU [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						30																30	$ 30
PPL Electric Utilities Corp [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																							220	87	127
Continuing Involvement (Details) [Abstract]
Energy purchases																							657	587	588
Development Projects [Abstract]
Construction work in progress						530								738								530	$ 530	738
PPL Electric Utilities Corp [Member] | Susquehanna Roseland Transmission Line [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi																							150
Capacity (in kilovolts) of a transmission line | kV																							500
Project costs capitalized						$ 648								597								$ 648	$ 648	597
PPL Electric Utilities Corp [Member] | Northeast Pocono Reliability Project [Member]
Development Projects [Abstract]
Total length (in miles) of the expansion project | mi																							58
Capacity (in kilovolts) of a transmission line | kV																							230
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer						100																100	100
Expected capital cost of an expansion project						$ 335																$ 335	$ 335
Number of new substations included in request | Integer						3																3	3
Capitalized costs						$ 319								183								$ 319	$ 319	183
PPL Electric Utilities Corp [Member] | PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases																						27
LG And E And KU Energy LLC [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																							236	449	254
Continuing Involvement (Details) [Abstract]
Energy purchases																							184	253	217
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Income tax expense (benefit)																							0	0	1
Income (Loss) from Discontinued Operations																							0	0	2
Development Projects [Abstract]
Construction work in progress						660								1,559								660	$ 660	1,559
LG And E And KU Energy LLC [Member] | LGE [Member]
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer			1							2
Costs associated with the retirement of generating units								$ 11
LG And E And KU Energy LLC [Member] | LGE [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						30																30	$ 30
LG And E And KU Energy LLC [Member] | KU [Member]
Development Projects [Abstract]
Generating units retired at the Green River plant | Integer								2
Costs associated with the retirement of generating units								$ 6
LG And E And KU Energy LLC [Member] | KU [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						30																30	$ 30
Louisville Gas And Electric Co [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																							126	118	26
Continuing Involvement (Details) [Abstract]
Energy purchases																							166	230	195
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer			1							2
Costs associated with the retirement of generating units								$ 11
Construction work in progress						390								676								390	$ 390	676
Louisville Gas And Electric Co [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						30																30	$ 30
Kentucky Utilities Co [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																							160	224	69
Continuing Involvement (Details) [Abstract]
Energy purchases																							18	23	$ 22
Development Projects [Abstract]
Generating units retired at the Green River plant | Integer								2
Costs associated with the retirement of generating units								$ 6
Construction work in progress						267								$ 880								267	$ 267	$ 880
Kentucky Utilities Co [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Planned capacity expansion (in MW) | MW																							10
Expected capital cost of an expansion project						$ 30																$ 30	$ 30

[1] Quarterly results can vary depending on, among other things, weather . Accordingly, comparisons among quarters of a year may not be indicative of overall tr ends and changes in operations.

[2] In the second quarter of 2015, PPL completed the spinoff of PPL Energy Supply sub stantially representing PPL's Supply segment. Accordingly, the previously reported operating results for PPL’s Supply segment have been reclassified as discontinued operations. See Note 8 to the Financial Statements for additional information.

[3] The second quarter of 2015 includes a loss of $879 million from the spinoff of PPL Energy Supply. See Note 8 to the Financial Statements for additional information.

[4] (f) The fourth quarter of 2014 includes a gain of $137 million (after-tax) from the sale of Hydroelectric generating facilities of PPL Montana. See Note 8 for additional information.

[5] Includes interest associated with the Supply segment with no additional allocation as the Supply segment was sufficiently capitalized.

[6] The distribution of PPL Energy Supply’s cash and cash equivalents at June 1, 2015 is included in "Net cash provided by (used in) financing activities - discontinued operations" on the Statement of Cash Flows for the year ended December 31, 2015 .