Financing Activities (Long-term Debt and Equity Securities) (Details) $ / shares in Units, £ in Millions, $ in Millions		1 Months Ended									12 Months Ended
		Nov. 30, 2015 GBP (£)	Nov. 30, 2015 USD ($)	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($) Integer	May. 31, 2014 USD ($) $ / shares shares	Mar. 31, 2014 USD ($)	Jul. 31, 2013 USD ($) $ / shares shares	May. 31, 2013 USD ($) Integer	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)		Nov. 30, 2015 USD ($)
Debt Instrument [Line Items]
Principal outstanding												$ 18,188			$ 19,171
Fair market value adjustments												37			30
Unamortized premium and (discount), net	[1]											(52)			(28)
Unamortized debt issuance costs												(119)			(125)
Total Long-term Debt												18,054			19,048
Less current portion of Long-term debt												1,000			485
Long-term Debt												17,054			18,563
Aggregate maturities of long-term debt (Details) [Abstract]
2016															485
2017															294
2018															348
2019															40
2020															1,301
Thereafter															$ 16,703
Equity Programs (Numeric) [Abstract]
Net proceeds from issuance of common stock											$ 203	1,074	$ 1,411
WPD PLC [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount | £		£ 500
Stated interest rate		3.625%															3.625%
Maturity date (in years)		Nov. 01, 2023	Nov. 01, 2023
Net proceeds from issuance of unsecured debt		£ 495	$ 746
PPL Electric [Member] | Senior Secured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate														4.95%	4.95%
Repayment of debt											$ 100
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | 2001 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												5,800			$ 6,700
PPL Electric [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Pollution Control Revenue Refunding Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed at a future date															224
Earliest date the company may redeem the debt											Feb. 15, 2015
Principal amount that may be redeemed in whole or in part															90
Earliest date the company may redeem the debt in whole or in part											Oct. 01, 2020
PPL Electric [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount				$ 350
Stated interest rate				4.15%
Maturity date (in years)				Oct. 01, 2045
Proceeds from issuance of secured debt				$ 345
LKE [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		2.125%															2.125%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
Repayment of debt			$ 400
LKE [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate amount of tax-exempt revenue bonds in a term rate mode															418
Aggregate amount of tax-exempt revenue bonds in a variable rate mode															507
Principal amount that may be put back to the issuer															251
LKE [Member] | First Mortgage Bonds [Member] | Insured Auction Rate Securities [Member]
Debt Instrument [Line Items]
Principal outstanding															231
Long-term Debt (Numeric) [Abstract]
Maximum number of days wherein interest rates reset											weekly or every 35 days
LGE [Member] | First Mortgage Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												3,700			4,200
LGE [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 300
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 298
LGE [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248
KU [Member] | First Mortgage Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												5,500			5,700
KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 248
KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248
United States of America, Dollars [Member]
Debt Instrument [Line Items]
Principal outstanding												10,829			$ 11,229
United States of America, Dollars [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.87%	3.87%
Maturity date of long-term debt range start	[2]										Jun. 01, 2018
Maturity date of long-term date range end	[2]										Mar. 15, 2044
Principal outstanding												3,825			$ 3,425
United States of America, Dollars [Member] | Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.97%	3.97%
Maturity date of long-term debt range start	[2]										Nov. 30, 2016
Maturity date of long-term date range end	[2]										Oct. 01, 2045
Principal outstanding	[3],[4],[5]											6,074			$ 6,874
United States of America, Dollars [Member] | Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													6.31%	6.31%
Maturity date of long-term debt range start	[2]										Mar. 30, 2067
Maturity date of long-term date range end	[2]										Apr. 30, 2073
Principal outstanding												930			$ 930
United Kingdom, Pounds [Member]
Debt Instrument [Line Items]
Principal outstanding												7,359			7,942	[6]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be put back to the issuer														£ 4,400	$ 6,600
United Kingdom, Pounds [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													5.33%	5.33%
Maturity date of long-term debt range start	[2]										May 01, 2016
Maturity date of long-term date range end	[2]										Dec. 10, 2040
Principal outstanding												6,627			$ 7,170	[7]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed in total but not in part														£ 225	$ 339
Earliest date the company may redeem the debt in total but not in part											Dec. 21, 2026
United Kingdom, Pounds [Member] | Index Linked Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													1.82%	1.82%
Maturity date of long-term debt range start	[2]										Jun. 01, 2043
Maturity date of long-term date range end	[2]										Dec. 01, 2056
Principal outstanding	[1]											732			$ 772
United Kingdom, Pounds [Member] | WPD South West [Member] | Index Linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed in total by series														£ 225	339
Earliest date the company may redeem the debt in total by series											Dec. 01, 2026
Increase (decrease) in principal due to inflation														4	6
United Kingdom, Pounds [Member] | WPD East Midlands [Member] | Index Linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Increase (decrease) in principal due to inflation														£ 4	6
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Number of tranches of debt entered into relating to the debt extinguishment | Integer										3
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 250
Stated interest rate										1.90%
Maturity date (in years)										Jun. 01, 2018
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 600
Stated interest rate										3.40%
Maturity date (in years)										Jun. 01, 2023
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 300
Stated interest rate										4.70%
Maturity date (in years)										Jun. 01, 2043
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Exchanged [Member]
Long-term Debt (Numeric) [Abstract]
Gain (loss) on extinguishment of debt											$ (10)
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 1,150
Stated interest rate										4.625%
Maturity date (in years)										Jul. 01, 2018
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Exchanged [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate										2.04%
Maturity date (in years)										Jun. 01, 2016
Principal amount extinguished										$ 300
Equity Units 2010 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Exchanged [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate										2.77%
Maturity date (in years)										Jun. 01, 2018
Principal amount extinguished										$ 850
Purchase Contacts 2010 [Member]
Equity Programs (Numeric) [Abstract]
Shares of common stock issued during the period | shares									40,000,000
Price per share of PPL common stock issued | $ / shares									$ 28.73
Net proceeds from issuance of common stock									$ 1,150
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 350
Stated interest rate								3.95%
Maturity date (in years)								Mar. 15, 2024
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Senior Unsecured Notes [Member] | Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 400
Stated interest rate								5.00%
Maturity date (in years)								Mar. 15, 2044
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member]
Long-term Debt (Numeric) [Abstract]
Gain (loss) on extinguishment of debt								$ (9)
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								4.32%
Maturity date (in years)								May 01, 2019
Portion of total principal settled in cash								$ 228
Principal amount extinguished								228
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 978
Stated interest rate								4.32%
Maturity date (in years)								May 01, 2019
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Exchanged [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								2.189%
Maturity date (in years)								Mar. 15, 2017
Principal amount extinguished								$ 350
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Notes [Member] | Junior Subordinated Notes [Member] | Exchanged [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								3.184%
Maturity date (in years)								Mar. 15, 2019
Principal amount extinguished								$ 400
Purchase Contacts 2011 [Member]
Equity Programs (Numeric) [Abstract]
Shares of common stock issued during the period | shares							31,700,000
Price per share of PPL common stock issued | $ / shares							$ 30.86
Net proceeds from issuance of common stock							$ 978
At The Market Stock Offering Program [Member]
Equity Programs (Numeric) [Abstract]
Shares of common stock issued during the period | shares											1,476,700
Net proceeds from issuance of common stock											$ 49
Number of distribution agreements | Integer						2
Aggregate sales price of common stock based on two separate equity distribution agreements						$ 500
Average price per common share | $ / shares											$ 33.41
PPL Electric Utilities Corp [Member]
Debt Instrument [Line Items]
Principal outstanding												2,614			2,864
Unamortized discount												(12)			(13)
Unamortized debt issuance costs												(21)			(23)
Total Long-term Debt												2,581			2,828
Less current portion of Long-term debt												100			0
Long-term Debt												2,481			2,828
Aggregate maturities of long-term debt (Details) [Abstract]
2016															0
2017															0
2018															0
2019															0
2020															100
Thereafter															$ 2,764
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate														4.95%	4.95%
Repayment of debt											$ 100
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													4.50%	4.50%
Maturity date of long-term debt range start	[2]										Dec. 15, 2020
Maturity date of long-term date range end	[2]										Oct. 01, 2045
Principal outstanding	[3],[5]											2,614			$ 2,864
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | 2001 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												5,800			6,700
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member] | Pollution Control Revenue Refunding Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed at a future date															224
Earliest date the company may redeem the debt											Feb. 15, 2015
Principal amount that may be redeemed in whole or in part															90
Earliest date the company may redeem the debt in whole or in part											Oct. 01, 2020
PPL Electric Utilities Corp [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount				$ 350
Stated interest rate				4.15%
Maturity date (in years)				Oct. 01, 2045
Proceeds from issuance of secured debt				$ 345
LG And E And KU Energy LLC [Member]
Debt Instrument [Line Items]
Principal outstanding												4,585			5,135
Fair market value adjustments												(1)			(1)
Unamortized discount												(17)			(16)
Unamortized debt issuance costs												(24)			(30)
Total Long-term Debt												4,543			5,088
Less current portion of Long-term debt												900			25
Long-term Debt												3,643			5,063
Aggregate maturities of long-term debt (Details) [Abstract]
2016															25
2017															194
2018															98
2019															40
2020															975
Thereafter															$ 3,803
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.97%	3.97%
Maturity date of long-term debt range start	[2]										Nov. 15, 2020
Maturity date of long-term date range end	[2]										Oct. 01, 2021
Principal outstanding												1,125			$ 725
Long-term Debt (Numeric) [Abstract]
Stated interest rate		2.125%															2.125%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
Repayment of debt			$ 400
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.58%	3.58%
Maturity date of long-term debt range start	[2]										Nov. 30, 2016
Maturity date of long-term date range end	[2]										Oct. 01, 2045
Principal outstanding	[3]											3,460			$ 4,010	[4]
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate amount of tax-exempt revenue bonds in a term rate mode															418
Aggregate amount of tax-exempt revenue bonds in a variable rate mode															507
Principal amount that may be put back to the issuer															251
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member] | Insured Auction Rate Securities [Member]
Debt Instrument [Line Items]
Principal outstanding															$ 231
Long-term Debt (Numeric) [Abstract]
Maximum number of days wherein interest rates reset											weekly or every 35 days
LG And E And KU Energy LLC [Member] | Note Payable [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.50%	3.50%
Maturity date of long-term date range end	[2]										Nov. 13, 2025
Principal outstanding												0			$ 400
Long-term Debt (Numeric) [Abstract]
Principal amount																	$ 400
Stated interest rate		3.50%															3.50%
Maturity date (in years)		Nov. 13, 2025	Nov. 13, 2025
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												3,700			4,200
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 300
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 298
LG And E And KU Energy LLC [Member] | LGE [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												5,500			5,700
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 248
LG And E And KU Energy LLC [Member] | KU [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248
Louisville Gas And Electric Co [Member]
Debt Instrument [Line Items]
Principal outstanding												1,359			1,659
Fair market value adjustments												(1)			(1)
Unamortized discount												(5)			(4)
Unamortized debt issuance costs												(8)			(12)
Total Long-term Debt												1,345			1,642
Less current portion of Long-term debt												250			25
Long-term Debt												1,095			1,617
Aggregate maturities of long-term debt (Details) [Abstract]
2016															25
2017															194
2018															98
2019															40
2020															0
Thereafter															$ 1,302
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.36%	3.36%
Maturity date of long-term debt range start	[2]										Nov. 30, 2016
Maturity date of long-term date range end	[2]										Oct. 01, 2045
Principal outstanding	[3]											1,359			$ 1,659	[4]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												3,700			4,200
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate amount of tax-exempt revenue bonds in a term rate mode															391
Aggregate amount of tax-exempt revenue bonds in a variable rate mode															183
Principal amount that may be put back to the issuer															23
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | Insured Auction Rate Securities [Member]
Debt Instrument [Line Items]
Principal outstanding															135
Long-term Debt (Numeric) [Abstract]
Maximum number of days wherein interest rates reset											weekly or every 35 days
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 300
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 298
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248
Kentucky Utilities Co [Member]
Debt Instrument [Line Items]
Principal outstanding												2,101			2,351
Unamortized discount												(10)			(10)
Unamortized debt issuance costs												(12)			(15)
Total Long-term Debt												2,079			2,326
Less current portion of Long-term debt												250			0
Long-term Debt												1,829			2,326
Aggregate maturities of long-term debt (Details) [Abstract]
2016															0
2017															0
2018															0
2019															0
2020															500
Thereafter															$ 1,851
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[2]													3.74%	3.74%
Maturity date of long-term debt range start	[2]										Nov. 01, 2020
Maturity date of long-term date range end	[2]										Oct. 01, 2045
Principal outstanding	[3]											2,101			$ 2,351	[4]
Long-term Debt (Numeric) [Abstract]
Stated interest rate		1.625%															1.625%
Maturity date (in years)		Nov. 15, 2015	Nov. 15, 2015
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien												$ 5,500			5,700
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate amount of tax-exempt revenue bonds in a term rate mode															27
Aggregate amount of tax-exempt revenue bonds in a variable rate mode															324
Principal amount that may be put back to the issuer															228
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | Insured Auction Rate Securities [Member]
Debt Instrument [Line Items]
Principal outstanding															$ 96
Long-term Debt (Numeric) [Abstract]
Maximum number of days wherein interest rates reset											weekly or every 35 days
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2025 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					3.30%
Maturity date (in years)					Oct. 01, 2025
Proceeds from issuance of secured debt					$ 248
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member] | First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 250
Stated interest rate					4.375%
Maturity date (in years)					Oct. 01, 2045
Proceeds from issuance of secured debt					$ 248

[1] The principal amount of the notes issued by WPD (South West) and WPD (East Midlands) is adjusted based on changes in a specified index, as detailed in the terms of the related indentures. The adjustment to the princi pal amount s from 2014 to 2015 was an increase of approximately £ 4 million ($ 6 million) resulting from inflation . In addition, this amount includes £ 225 million ($ 339 million at Decembe r 31, 2015 ) of notes issued by WPD (South West) that may be redeemed, in total by series, on December 1, 2026 , at the greater of the adjusted principal value and a make-whole value determined by reference to the gross real yield on a nomina ted U.K. government bond.

[2] The table reflects principal maturities only, based on stated maturities or earlier put dates, and the weighted-average rates as of December 31, 2015 .

[3] Includ e s PPL Electric's senior secured and first mortgage bonds that are secured by the lien of PPL Electric 's 2001 Mortgage Indenture, which covers substantially all electric distribution plant and certain transmission plant owned by PPL Electric. The carrying value of PPL Electric's property, plant and equipment was approximately $ 6.7 billion and $ 5.8 billion at December 31, 2015 and 2014 . Includes LG&E's first m ortgage bonds that are secured by the lien of t he LG&E 2010 Mortgage Indenture which creates a lien, subject to certain exceptions and exclusions, on substantially all of LG&E's real and tangible personal property located in Kentucky and used or to be used in connection with the generation, transmission and distribution of electricity and the storage and distribution of natural gas. The aggregate carrying value of the property subject to the lien was $ 4.2 billion and $ 3.7 billion at December 31, 2015 and 2014 . Includes KU's first mortgage bonds that are secured by the lien of the KU 2010 Mortgage Indenture which creates a lien, subject to certain exceptions and exclusions, on substan tially all of KU's real and tangible personal property located in Kentucky and used or to be used in connection with the generation, transmission and distribution of electricity. The aggregate carrying value of the property subject to the lien was $ 5.7 billion and $ 5.5 billion at December 31, 2015 and 2014 .

[4] Includes LG&E 's and KU 's series of first mortgage bonds that were issued to the respective trustee s of tax-exempt revenue bonds to secure its respective obligations to make payments with respect to each series of bonds. The first mortgage bonds were issued in the same principal amount s , contain payment and redemption provisions that correspond to and bear the same interest rate as such tax-exempt revenue bonds. These first mortgage bonds were issued under the LG&E 2010 Mortgage Indenture and the KU 2010 Mortgage Indenture and are secured as noted in ( a ) above. The related tax-exempt revenue bonds wer e issued by various governmental entities, principally counties in Kentucky, on behalf of LG&E and KU. The related revenue bond documents allow LG&E and KU to convert the interest rate mode on the bonds from time to time to a commercial paper rate, daily rate, weekly rate, term rate of at least one year or, in some cases, an auction rate or a LIBOR index rate . At December 31, 2015 , the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a term rate mode totaled $ 418 million for LKE, comprised of $ 391 million and $ 27 million for LG&E and KU , respectively . At December 31, 2015 , the aggregate tax-exempt revenue bonds issued on be half of LG&E and KU that were in a variable rate mode totaled $ 507 million for LKE, comprised of $ 183 million and $ 324 million for LG&E and KU , respectively . Several series of the tax-exempt revenue bonds are insured by monoline bond insurers whose ratings were reduced due to exposures relating to insurance of sub-prime mortgages. Of the bonds outstanding, $ 231 million are in the form of insured auction rate securities ($ 135 million for LG&E and $ 96 million for KU) , wherein interest rates are reset either weekly or every 35 days via an auction proces s. Beginning in late 2007, the interest rates on these insured bonds began to increase due to investor concerns about the creditworthiness of the bond insurers. During 2008, interest rates increased, and LG&E and KU experienced failed auctions when there were insufficient bids for the bonds. When a failed auction occurs, the interest rate is set pursuant to a formula stipulated in the indenture. As noted above, the instruments governing these auction rate bonds permit LG&E and KU to convert the bonds to other interest rate modes. Certain of the variable rate tax-exempt revenue bonds totaling $ 251 million at December 31, 2015 ($ 23 million for LG&E and $ 228 million for KU) , are subject to tender for purchase by LG&E and KU at the option of the holder and to mandatory tender for purchase by LG&E and KU upon the occurrence of certain events.

[5] Includes PPL Electric 's series of senior secured bonds that secure its obligations to make payments with respect to each se ries of Pollution Control Bonds that were issued by the LCIDA and the PEDFA on behalf of PPL Electric. These senior secured bonds were issued in the same principal amount, contain payment and redemption provisions that correspond to and bear the same inte rest rate as such Pollution Control Bonds. These senior secured bonds were issued under PPL Electric's 2001 Mortgage Indentur e and are secured as noted in (a ) above. This amount includes $ 224 million that may be rede emed at par beginning in 2015 and $ 90 million that may be redeemed, in whole or in part, at par beginning in October 2020 and are subject to mandatory redemption upon determination that the interest rate on the bonds would be included in the holders' gross income for federal tax purposes.

[6] I ncludes £ 4.4 billion ($ 6.6 billion at December 31, 2015 ) of notes tha t may be put by the holders to the issuer for redemption if the long-term credit ratings assigned to the n otes are withdrawn by any of the rating agencies (Moody's or S&P) or reduced to a non-investment grade rating of Ba1 or BB+ or lower in connection with a restructu ring event which includes the loss of, or a material adverse change to, the distribution license s under which the issuer operate s .

[7] I ncludes £ 225 million ($ 339 million at December 31, 2015 ) of notes that may be redeemed, in total but not in part, on December 21, 2026 , at the greater of the principal value or a value determined by reference to the gross redemption yield on a nominated U.K. G overnment bond.