Financing Activities (Long-term Debt and Equity Securities) (Details) $ / shares in Units, shares in Thousands, £ in Millions, $ in Millions		1 Months Ended											12 Months Ended
		Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 GBP (£)	Sep. 30, 2016 USD ($)	Aug. 31, 2016	May 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Nov. 30, 2015	Feb. 28, 2015 USD ($) Integer	May 31, 2014 USD ($) $ / shares shares	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2016 GBP (£)	Aug. 30, 2016 USD ($)	May 31, 2016 GBP (£)
Debt Instrument [Line Items]
Principal outstanding		$ 18,399											$ 18,399	$ 19,171
Less current portion of Long-term debt		518											518	485
Long-term Debt		17,808											17,808	18,563
Aggregate maturities of long-term debt (Details) [Abstract]
2017		518											518
2018		348											348
2019		136											136
2020		1,262											1,262
2021		1,150											1,150
Thereafter		14,985											14,985
Equity Programs (Numeric) [Abstract]
Net proceeds from issuance of common stock													144	203	$ 1,074
Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed in total but not in part		281											$ 281			£ 225
Earliest date the company may redeem the debt in total but not in part													Dec. 21, 2026
WPD PLC [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt							$ 460
Long-term Debt (Numeric) [Abstract]
Stated interest rate							3.90%											3.90%
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		281											$ 281			225
Earliest date the company may redeem the debt in total by series													Dec. 01, 2026
Increase (decrease) in principal due to inflation		13											$ 13			10
WPD East Midlands [Member] | Index Linked Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Term							10 years
Long-term Debt (Numeric) [Abstract]
Principal amount | £																		£ 100
Stated interest rate							0.4975%											0.4975%
WPD East Midlands [Member] | Index Linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount | £				£ 40
Stated interest rate				2.671%
Maturity date (in years)			Jun. 01, 2043	Jun. 01, 2043
Proceeds from Debt, Net of Issuance Costs | £				£ 83
Proceeds from debt, including premium net of debt issuance costs			$ 101
Increase (decrease) in principal due to inflation		13											$ 13			£ 10
PPL Capital Funding [Member] | Senior Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount							$ 650
Stated interest rate							3.10%											3.10%
Maturity date (in years)							May 15, 2026
Proceeds from Debt, Net of Issuance Costs							$ 645
PPL Electric [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 116
Maturity date (in years)								Mar. 09, 2029
Debt Instruments Initial Term Rate								0.90%
Debt Instruments Future Repurchase Date								Sep. 01, 2017
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 108
Maturity date (in years)								Mar. 09, 2027
Debt Instruments Initial Term Rate								0.90%
Debt Instruments Future Repurchase Date								Aug. 15, 2017
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								4.70%
Maturity date (in years)								Mar. 09, 2029
Principal amount redeemed at par								$ 116
PPL Electric [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series B [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								4.75%
Maturity date (in years)								Mar. 09, 2027
Principal amount redeemed at par								$ 108
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		7,600											$ 7,600	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											224
Principal amount that may be redeemed in whole or in part		90											$ 90
Earliest date the company may redeem the debt in whole or in part													Oct. 01, 2020
PPL Electric [Member] | First Mortgage Bonds [Member] | 2001 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								224
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		514											$ 514
Aggregate amount of tax-exempt revenue bonds in a variable rate mode		386											386
Principal amount that may be put back to the issuer		$ 375											375
LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 125
Maturity date (in years)					Sep. 01, 2044
LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Aug. 01, 2030
Principal amount redeemed at par					$ 83
LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Oct. 01, 2032
Principal amount redeemed at par					$ 42
LGE [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)		May 01, 2027
Principal amount redeemed at par		$ 25											25
LGE [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien		4,400											4,400	4,200
KU [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount																	$ 96
Stated interest rate																	1.05%
Maturity date (in years)						Sep. 01, 2042
Debt Instruments Future Repurchase Date						Sep. 01, 2019
KU [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series C [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)						Oct. 01, 2032
Principal amount redeemed at par																	$ 96
KU [Member] | First Mortgage Bonds [Member] | 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien		5,800											$ 5,800	$ 5,700
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 Debt [Member]
Long-term Debt (Numeric) [Abstract]
Gain (loss) on extinguishment of debt												$ 9
Equity Units 2011 [Member] | PPL Capital Funding [Member] | Junior Subordinated Debt [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 Debt [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 Debt [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 Debt [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
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]
Debt Instrument [Line Items]
Common Stock Issued Average Price Per Share | $ / shares													$ 35.23	$ 33.41
Equity Programs (Numeric) [Abstract]
Shares of common stock issued during the period | shares													710	1,477
Net proceeds from issuance of common stock													$ 25	$ 49
Number of distribution agreements | Integer										2
Aggregate sales price of common stock based on two separate equity distribution agreements										$ 500
U.S. [Member]
Debt Instrument [Line Items]
Principal outstanding		$ 11,854											$ 11,854	11,229
U.S. [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.75%											3.75%			3.75%
Maturity date of long-term debt range start	[1]												Jun. 01, 2018
Maturity date of long-term date range end	[1]												Mar. 15, 2044
Principal outstanding		$ 4,075											$ 4,075	3,425
U.S. [Member] | Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.88%											3.88%			3.88%
Maturity date of long-term debt range start	[1]												Aug. 15, 2017
Maturity date of long-term date range end	[1]												Oct. 01, 2045
Principal outstanding	[2],[3],[4]	$ 6,849											$ 6,849	6,874
U.S. [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	6.31%											6.31%			6.31%
Maturity date of long-term debt range start	[1]												Mar. 30, 2067
Maturity date of long-term date range end	[1]												Apr. 30, 2073
Principal outstanding		$ 930											$ 930	930
U.K. [Member]
Debt Instrument [Line Items]
Principal outstanding		6,545											6,545	7,942
Fair market value adjustments		22											22	30
Unamortized premium and (discount), net	[5]	20											20	(28)
Unamortized debt issuance costs		(115)											(115)	(125)
Total Long-term Debt		18,326											18,326	19,048
Less current portion of Long-term debt		518											518	485
Long-term Debt		17,808											17,808	18,563
Long-term Debt (Numeric) [Abstract]
Principal amount that may be put back to the issuer		$ 5,500											$ 5,500			£ 4,400
U.K. [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	5.44%											5.44%			5.44%
Maturity date of long-term debt range start	[1]												Dec. 15, 2017
Maturity date of long-term date range end	[1]												Dec. 10, 2040
Principal outstanding	[6]	$ 5,707											$ 5,707	7,170
U.K. [Member] | Index Linked Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[5]	1.67%											1.67%			1.67%
Maturity date of long-term debt range start	[1]												May 31, 2026
Maturity date of long-term date range end	[1]												Dec. 01, 2056
Principal outstanding	[5]	$ 838											$ 838	772
PPL Electric Utilities Corp [Member]
Debt Instrument [Line Items]
Principal outstanding		2,864											2,864	2,864
Unamortized discount		(12)											(12)	(13)
Unamortized debt issuance costs		(21)											(21)	(23)
Total Long-term Debt		2,831											2,831	2,828
Less current portion of Long-term debt		224											224	0
Long-term Debt		2,607											$ 2,607	2,828
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
Aggregate maturities of long-term debt (Details) [Abstract]
2017		224											$ 224
2018		0											0
2019		0											0
2020		100											100
2021		400											400
Thereafter		$ 2,140											$ 2,140
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 116
Maturity date (in years)								Mar. 09, 2029
Debt Instruments Initial Term Rate								0.90%
Debt Instruments Future Repurchase Date								Sep. 01, 2017
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds Series 2016B [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 108
Maturity date (in years)								Mar. 09, 2027
Debt Instruments Initial Term Rate								0.90%
Debt Instruments Future Repurchase Date								Aug. 15, 2017
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								4.70%
Maturity date (in years)								Mar. 09, 2029
Principal amount redeemed at par								$ 116
PPL Electric Utilities Corp [Member] | Senior Secured Notes [Member] | Lehigh County Industrial Development Authority Pollution Control Revenue Refunding Bonds 2005 Series B [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate								4.75%
Maturity date (in years)								Mar. 09, 2027
Principal amount redeemed at par								$ 108
PPL Electric Utilities Corp [Member] | Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	4.20%											4.20%			4.20%
Maturity date of long-term debt range start	[1]												Aug. 15, 2017
Maturity date of long-term date range end	[1]												Oct. 01, 2045
Principal outstanding	[3],[4]	$ 2,864											$ 2,864	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		7,600											7,600	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											224
Principal amount that may be redeemed in whole or in part		90											$ 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]
Long-term Debt (Numeric) [Abstract]
Principal amount								$ 224
LG And E And KU Energy LLC [Member]
Debt Instrument [Line Items]
Principal outstanding		5,110											$ 5,110	5,135
Fair market value adjustments		(1)											(1)	(1)
Unamortized discount		(15)											(15)	(16)
Unamortized debt issuance costs		(29)											(29)	(30)
Total Long-term Debt		5,065											5,065	5,088
Less current portion of Long-term debt		194											194	25
Long-term Debt		4,871											4,871	5,063
Aggregate maturities of long-term debt (Details) [Abstract]
2017		194											194
2018		98											98
2019		136											136
2020		975											975
2021		250											250
Thereafter		$ 3,457											$ 3,457
LG And E And KU Energy LLC [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.97%											3.97%			3.97%
Maturity date of long-term debt range start	[1]												Nov. 15, 2020
Maturity date of long-term date range end	[1]												Oct. 01, 2021
Principal outstanding		$ 725											$ 725	725
Long-term Debt (Numeric) [Abstract]
Stated interest rate									2.125%
Maturity date (in years)									Nov. 15, 2015
LG And E And KU Energy LLC [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.67%											3.67%			3.67%
Maturity date of long-term debt range start	[1]												Apr. 03, 2017
Maturity date of long-term date range end	[1]												Oct. 01, 2045
Principal outstanding	[2],[3]	$ 3,985											$ 3,985	4,010
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		514											514
Aggregate amount of tax-exempt revenue bonds in a variable rate mode		386											386
Principal amount that may be put back to the issuer		$ 375											$ 375
LG And E And KU Energy LLC [Member] | Note Payable [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.50%											3.50%			3.50%
Maturity date of long-term date range end	[1]												Nov. 13, 2025
Principal outstanding		$ 400											$ 400	400
LG And E And KU Energy LLC [Member] | LGE [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 125
Maturity date (in years)					Sep. 01, 2044
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Aug. 01, 2030
Principal amount redeemed at par					$ 83
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Oct. 01, 2032
Principal amount redeemed at par					$ 42
LG And E And KU Energy LLC [Member] | LGE [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)		May 01, 2027
Principal amount redeemed at par		$ 25											$ 25
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		4,400											$ 4,400	4,200
LG And E And KU Energy LLC [Member] | KU [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
LG And E And KU Energy LLC [Member] | KU [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount																	$ 96
Stated interest rate																	1.05%
Maturity date (in years)						Sep. 01, 2042
Debt Instruments Future Repurchase Date						Sep. 01, 2019
LG And E And KU Energy LLC [Member] | KU [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series C [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)						Oct. 01, 2032
Principal amount redeemed at par																	$ 96
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		5,800											$ 5,800	5,700
Louisville Gas And Electric Co [Member]
Debt Instrument [Line Items]
Principal outstanding		1,634											1,634	1,659
Fair market value adjustments		(1)											(1)	(1)
Unamortized discount		(4)											(4)	(4)
Unamortized debt issuance costs		(12)											(12)	(12)
Total Long-term Debt		1,617											1,617	1,642
Less current portion of Long-term debt		194											194	25
Long-term Debt		1,423											$ 1,423	1,617
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
Aggregate maturities of long-term debt (Details) [Abstract]
2017		194											$ 194
2018		98											98
2019		40											40
2020		0											0
2021		0											0
Thereafter		$ 1,302											1,302
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 125
Maturity date (in years)					Sep. 01, 2044
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Aug. 01, 2030
Principal amount redeemed at par					$ 83
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | County of Trimble, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)					Oct. 01, 2032
Principal amount redeemed at par					$ 42
Louisville Gas And Electric Co [Member] | Senior Secured Notes [Member] | Jefferson County Pollution Control Revenue Refunding Bonds, 2000 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)		May 01, 2027
Principal amount redeemed at par		$ 25											$ 25
Louisville Gas And Electric Co [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.45%											3.45%			3.45%
Maturity date of long-term debt range start	[1]												Apr. 03, 2017
Maturity date of long-term date range end	[1]												Oct. 01, 2045
Principal outstanding	[2],[3]	$ 1,634											$ 1,634	1,659
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		4,400											4,400	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											391
Aggregate amount of tax-exempt revenue bonds in a variable rate mode		158											158
Principal amount that may be put back to the issuer		147											147
Kentucky Utilities Co [Member]
Debt Instrument [Line Items]
Principal outstanding		2,351											2,351	2,351
Unamortized discount		(9)											(9)	(10)
Unamortized debt issuance costs		(15)											(15)	(15)
Total Long-term Debt		2,327											2,327	2,326
Less current portion of Long-term debt		0											0	0
Long-term Debt		2,327											$ 2,327	2,326
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode													1 year
Aggregate maturities of long-term debt (Details) [Abstract]
2017		0											$ 0
2018		0											0
2019		96											96
2020		500											500
2021		0											0
Thereafter		$ 1,755											$ 1,755
Kentucky Utilities Co [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2016 Series A [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount																	$ 96
Stated interest rate																	1.05%
Maturity date (in years)						Sep. 01, 2042
Debt Instruments Future Repurchase Date						Sep. 01, 2019
Kentucky Utilities Co [Member] | Senior Secured Notes [Member] | County of Carroll, Kentucky Pollution Control Revenue Refunding Bonds, 2002 Series C [Member]
Long-term Debt (Numeric) [Abstract]
Maturity date (in years)						Oct. 01, 2032
Principal amount redeemed at par																	$ 96
Kentucky Utilities Co [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate	[1]	3.82%											3.82%			3.82%
Maturity date of long-term debt range start	[1]												Sep. 01, 2019
Maturity date of long-term date range end	[1]												Oct. 01, 2045
Principal outstanding	[2],[3]	$ 2,351											$ 2,351	2,351
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		5,800											5,800	$ 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		123											123
Aggregate amount of tax-exempt revenue bonds in a variable rate mode		228											228
Principal amount that may be put back to the issuer		$ 228											$ 228

[1] The table reflects principal maturities only, based on stated maturities or earlier put dates, and the weighted-average rates as of December 31, 2016.

[2] Includes LG&E's and KU's series of first mortgage bonds that were issued to the respective trustees 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 amounts, 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 were 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, 2016, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a term rate mode totaled $514 million for LKE, comprised of $391 million and $123 million for LG&E and KU, respectively. At December 31, 2016, the aggregate tax-exempt revenue bonds issued on behalf of LG&E and KU that were in a variable rate mode totaled $386 million for LKE, comprised of $158 million and $228 million for LG&E and KU, respectively. Certain of the variable rate tax-exempt revenue bonds totaling $375 million at December 31, 2016 ($147 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.

[3] Includes 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 $7.6 billion and $6.7 billion at December 31, 2016 and 2015.Includes LG&E's first mortgage bonds that are secured by the lien of the 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 $4.4 billion and $4.2 billion at December 31, 2016 and 2015. 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 substantially 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 $5.8 billion and $5.7 billion at December 31, 2016 and 2015.

[4] Includes PPL Electric's series of senior secured bonds that secure its obligations to make payments with respect to each series 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 interest rate as such Pollution Control Bonds. These senior secured bonds were issued under PPL Electric's 2001 Mortgage Indenture and are secured as noted in (a) above. This amount includes $224 million of which PPL Electric is allowed to convert the interest rate mode on the bonds from time to time to a commercial paper rate, daily rate, weekly rate, or term rate of at least one year 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.

[5] 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 principal amounts from 2015 to 2016 was an increase of approximately £10 million ($13 million) resulting from inflation. In addition, this amount includes £225 million ($281 million at December 31, 2016) 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 nominated U.K. government bond.

[6] Includes £225 million ($281 million at December 31, 2016) 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. Government bond.