Acquisitions, Development and Divestures (Details) $ in Millions			1 Months Ended				3 Months Ended								7 Months Ended	12 Months Ended
		Jun. 01, 2015 USD ($) shares	Sep. 30, 2015 USD ($) Integer	Jun. 30, 2015 USD ($) Integer	Mar. 31, 2015 Integer	Nov. 30, 2014 USD ($) Integer MW	Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)	[1],[2],[3]	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) kV Integer mi MW	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) Integer	Jun. 30, 2016 USD ($)
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Deferred income tax recorded as result of agreement to adjust valuation allowances																$ 560	$ 428	$ 666
Continuing Involvement (Details) [Abstract]
Energy purchases																706	855	924
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Income tax expense (benefit)																0	(30)	198
Income (Loss) from Discontinued Operations							$ (6)	[1],[2],[3]	$ (3)	[1],[2],[3]	$ (1,007)	[1],[2],[3]	$ 95			0	(921)	300
Development Projects [Abstract]
Capitalized costs							28,716								$ 28,716	28,661	28,716
Construction work in progress							1,315								1,315	$ 1,134	1,315
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
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
Project costs capitalized																$ 350
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer																100
Number of new substations included in request | Integer																3
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 separation benefits							13								13		13
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 separation 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 | shares		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
Net assets distributed		$ 3,200
Number of market approaches | Integer				2
Review period used in determining the control premium (in years)				5 years
Minimum transaction value reviewed in determining the control premium				$ 1,000
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																$ 35	25
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Operating revenues																	1,427	3,848
Operating expenses																	1,328	3,410
Other Income (Expense) - net																	(21)	13
Interest expense	[4]																150	190
Gain on sale of Montana																	0	237
Income tax expense (benefit)																	(30)	198
Gain (loss) on disposal group											$ (879)						(879)	0
Income (Loss) from Discontinued Operations																	(921)	300
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Assets and Liabilities of Discontinued Operations (Details) [Abstract]
Adjustment for loss on spinoff		879
Net assets distributed		3,200
PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases															27	106
PPL Energy Supply Spinoff [Member] | Talen Energy Market Value [Member]
Discontinued Operations - Spinoff of PPL Energy Supply (Numeric) [Abstract]
Weighting				50.00%
Net assets distributed		1,400
Midpoint of premiums received in market sales transactions reviewed				25.00%
Control Premium				25.00%
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%
Net assets distributed		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%
Net assets distributed		$ 700
Midpoint of premiums received in market sales transactions reviewed		25.00%
Control Premium		25.00%
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 on sale of Montana																		237
Gain (loss) on disposal group																		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
LGE [Member]
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer				2	1
Costs associated with the retirement of generating units			$ 11						11
KU [Member]
Development Projects [Abstract]
Generating Units Retired Plant Two | Integer			2
Costs associated with the retirement of generating units			$ 6						6
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																221	220	87
Continuing Involvement (Details) [Abstract]
Energy purchases																535	657	587
Development Projects [Abstract]
Capitalized costs							6,161								6,161	6,940	6,161
Construction work in progress							530								530	$ 641	530
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
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
Project costs capitalized																$ 350
Adder to the return on equity incentive denied in ratemaking request (in basis points) | Integer																100
Number of new substations included in request | Integer																3
PPL Electric Utilities Corp [Member] | PPL Energy Supply Spinoff [Member] | Talen Energy Marketing [Member]
Continuing Involvement (Details) [Abstract]
Energy purchases															27	$ 106
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																291	236	449
Continuing Involvement (Details) [Abstract]
Energy purchases																171	184	253
Discontinued Operations - Spinoff of PPL Energy Supply - Summarized Results of Discontinued Operations (Details) [Abstract]
Income tax expense (benefit)																1	1	1
Development Projects [Abstract]
Capitalized costs							10,743								10,743	11,281	10,743
Construction work in progress							660								660	317	660
LG And E And KU Energy LLC [Member] | LGE [Member]
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer				2	1
Costs associated with the retirement of generating units			$ 11						11
LG And E And KU Energy LLC [Member] | KU [Member]
Development Projects [Abstract]
Generating Units Retired Plant Two | Integer			2
Costs associated with the retirement of generating units			$ 6						6
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																147	126	118
Continuing Involvement (Details) [Abstract]
Energy purchases																153	166	230
Development Projects [Abstract]
Generating units retired at the Cane Run plant | Integer				2	1
Capitalized costs							4,400								4,400	4,859	4,400
Construction work in progress							390								390	133	390
Costs associated with the retirement of generating units			$ 11						11
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																126	160	224
Continuing Involvement (Details) [Abstract]
Energy purchases																18	18	$ 23
Development Projects [Abstract]
Capitalized costs							6,340								6,340	6,417	6,340
Construction work in progress							$ 267								$ 267	$ 181	$ 267
Generating Units Retired Plant Two | Integer			2
Costs associated with the retirement of generating units			$ 6						$ 6
Kentucky Utilities Co [Member] | Solar Generation Facility [Member]
Development Projects [Abstract]
Completed Megawatt Expansion Of Capacity | MW																10
Actual Capital Cost Of Expansion Project																			$ 25

[1] In the second quarter of 2015, PPL completed the spinoff of PPL Energy Supply substantially 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.

[2] PPL has paid quarterly cash dividends on its common stock in every year since 1946. Future dividends, declared at the discretion of the Board of Directors, will be dependent upon future earnings, cash flows, financial requirements and other factors.

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

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