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The principal amount that may be redeemed, in total by series, at a later date, 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.

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Adjustments made to record long-term debt at fair value at the time of an entity's acquisition.

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Value of notes that may be redeemed at par.

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Face (par) amount of debt instrument at time of issuance.

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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions	1 Months Ended				6 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 GBP (£)	Apr. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Sep. 30, 2019 GBP (£)	Sep. 17, 2019	Jun. 30, 2019 GBP (£)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Principal outstanding						$ 22,002					$ 20,694
Unamortized premium and (discount), net						5					9
Unamortized debt issuance costs						(126)					(120)
Total Long-term Debt						21,893					20,599
Less current portion of Long-term debt						1,172					530
Long-term Debt						20,721					20,069
Aggregate maturities of long-term debt (Details) [Abstract]
2019						1,169
2020						1,574
2021						1,274
2022						2,254
2023						932
Thereafter						14,799
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						423	£ 327
WPD South Wales [Member] \| Index-linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount \| £										£ 50
Stated interest rate					2.189%					2.189%
Proceeds from debt, including premium net of debt issuance costs					$ 63
WPD West Midlands [Member] \| Index-linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount \| £								£ 250
Stated interest rate	1.75%							1.75%
Proceeds from Debt, Net of Issuance Costs \| £		£ 245
Proceeds from debt, including premium net of debt issuance costs	$ 301
PPL Electric [Member] \| Senior Secured Bonds 5.15% Series Due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount						$ 100
Stated interest rate						5.15%	5.15%
PPL Electric [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						$ 10,100					9,400
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
Principal amount that may be redeemed in whole or in part						$ 90
Minimum length of time to convert interest rate mode						1 year
PPL Electric [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 400
Stated interest rate	3.00%							3.00%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt	$ 390
LGE [Member] \| Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 128
Stated interest rate			1.85%
LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 31
Stated interest rate					1.65%					1.65%
LGE [Member] \| Environmental Facilities Revenue Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 35
Stated interest rate					1.65%					1.65%
LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate									1.75%
LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 40
LGE [Member] \| First Mortgage Bonds [Member] \| 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						$ 5,300					5,100
LGE [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode						1 year
LGE [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 400
Stated interest rate			4.25%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 396
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						$ 700
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						181
KU [Member] \| Environmental Facilities Revenue Bonds, 2004 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 50
Stated interest rate	1.75%							1.75%
KU [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 96
Stated interest rate	1.55%							1.55%
KU [Member] \| Environmental Facilities Revenue Bonds, 2006 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 54
Stated interest rate	1.20%							1.20%
KU [Member] \| Environmental Facilities Revenue Bonds, 2008 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 78
Stated interest rate	1.20%							1.20%
KU [Member] \| Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 13
Stated interest rate	1.30%							1.30%
KU [Member] \| First Mortgage Bonds [Member] \| 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						$ 6,600					6,300
KU [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode						1 year
KU [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 300
Stated interest rate			4.375%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 303
WPD South West, WPD East Midlands and WPD South Wales [Member] \| Index-linked Senior Unsecured Notes [Member]
Long-term Debt (Numeric) [Abstract]
Increase (decrease) in principal due to inflation						$ 26	£ 20
U.S. [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 13,960					13,160
U.S. [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.88%	3.88%
Principal outstanding						$ 4,325					4,325
U.S. [Member] \| Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.95%	3.95%
Principal outstanding						$ 8,705					7,705
U.S. [Member] \| Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						5.24%	5.24%
Principal outstanding						$ 930					930
U.S. [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate
Principal outstanding						$ 0					200
U.K. [Member]
Debt Instrument [Line Items]
Principal outstanding						8,042					7,534
Fair market value adjustments						12					16
Long-term Debt (Numeric) [Abstract]
Principal amount that may be put back to the issuer						$ 7,400	£ 5,700
U.K. [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						4.97%	4.97%
Principal outstanding						$ 6,874					6,471
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed in total but not in part						$ 291	£ 225
U.K. [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						2.18%	2.18%
Principal outstanding						$ 64					0
U.K. [Member] \| Index-linked Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						1.45%	1.45%
Principal outstanding						$ 1,104					1,063
PPL Electric Utilities Corp [Member]
Debt Instrument [Line Items]
Principal outstanding						4,039					3,739
Unamortized discount						(24)					(18)
Unamortized debt issuance costs						(30)					(27)
Total Long-term Debt						3,985					3,694
Less current portion of Long-term debt						0					0
Long-term Debt						3,985					3,694
Aggregate maturities of long-term debt (Details) [Abstract]
2019						0
2020						400
2021						474
2022						90
2023						0
Thereafter						3,075
PPL Electric Utilities Corp [Member] \| Senior Secured Bonds 5.15% Series Due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount						$ 100
Stated interest rate						5.15%	5.15%
PPL Electric Utilities Corp [Member] \| Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						4.08%	4.08%
Principal outstanding						$ 4,039					3,739
PPL Electric Utilities Corp [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						10,100					9,400
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
Principal amount that may be redeemed in whole or in part						$ 90
Minimum length of time to convert interest rate mode						1 year
PPL Electric Utilities Corp [Member] \| First Mortgage Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount				$ 400
Stated interest rate				3.00%
Proceeds from Debt, Net of Issuance Costs				$ 390
LG And E And KU Energy LLC [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 6,041					5,541
Debt Instrument, Unamortized Premium						5					0
Unamortized discount						(12)					(13)
Unamortized debt issuance costs						(32)					(26)
Total Long-term Debt						6,002					5,502
Less current portion of Long-term debt						975					530
Long-term Debt						5,027					4,972
Aggregate maturities of long-term debt (Details) [Abstract]
2019						975
2020						674
2021						0
2022						13
2023						0
Thereafter						$ 4,379
LG And E And KU Energy LLC [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.97%	3.97%
Principal outstanding						$ 725					725
LG And E And KU Energy LLC [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate
Principal outstanding						$ 0					200
LG And E And KU Energy LLC [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.84%	3.84%
Principal outstanding						$ 4,666					3,966
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						700
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						$ 181
LG And E And KU Energy LLC [Member] \| PPL Affiliate [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.69%	3.69%
Principal outstanding						$ 650					650
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 128
Stated interest rate			1.85%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 31
Stated interest rate					1.65%					1.65%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Environmental Facilities Revenue Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 35
Stated interest rate					1.65%					1.65%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate									1.75%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 40
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						$ 5,300					5,100
LG And E And KU Energy LLC [Member] \| LGE [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [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] \| First Mortgage Bonds [Member] \| First Mortgage Bonds Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 400
Stated interest rate			4.25%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 396
LG And E And KU Energy LLC [Member] \| KU [Member] \| Environmental Facilities Revenue Bonds, 2004 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 50
Stated interest rate	1.75%							1.75%
LG And E And KU Energy LLC [Member] \| KU [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 96
Stated interest rate	1.55%							1.55%
LG And E And KU Energy LLC [Member] \| KU [Member] \| Environmental Facilities Revenue Bonds, 2006 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 54
Stated interest rate	1.20%							1.20%
LG And E And KU Energy LLC [Member] \| KU [Member] \| Environmental Facilities Revenue Bonds, 2008 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 78
Stated interest rate	1.20%							1.20%
LG And E And KU Energy LLC [Member] \| KU [Member] \| Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 13
Stated interest rate	1.30%							1.30%
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						$ 6,600					6,300
LG And E And KU Energy LLC [Member] \| KU [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [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] \| First Mortgage Bonds [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 300
Stated interest rate			4.375%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 303
Louisville Gas And Electric Co [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 2,024					1,824
Unamortized discount						(4)					(4)
Unamortized debt issuance costs						(15)					(11)
Total Long-term Debt						2,005					1,809
Less current portion of Long-term debt						0					434
Long-term Debt						2,005					1,375
Aggregate maturities of long-term debt (Details) [Abstract]
2019						0
2020						292
2021						0
2022						0
2023						0
Thereafter						$ 1,732
Louisville Gas And Electric Co [Member] \| Jefferson County Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 128
Stated interest rate			1.85%
Louisville Gas And Electric Co [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 31
Stated interest rate					1.65%					1.65%
Louisville Gas And Electric Co [Member] \| Environmental Facilities Revenue Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 35
Stated interest rate					1.65%					1.65%
Louisville Gas And Electric Co [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate									1.75%
Louisville Gas And Electric Co [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount					$ 40
Louisville Gas And Electric Co [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate
Principal outstanding						$ 0					200
Louisville Gas And Electric Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.73%	3.73%
Principal outstanding						$ 2,024					1,624
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						$ 5,300					5,100
Louisville Gas And Electric Co [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode						1 year
Aggregate amount of tax-exempt revenue bonds in a term rate mode						$ 392
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						148
Louisville Gas And Electric Co [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 400
Stated interest rate			4.25%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 396
Kentucky Utilities Co [Member]
Debt Instrument [Line Items]
Principal outstanding						2,642					2,342
Debt Instrument, Unamortized Premium						5					0
Unamortized discount						(8)					(8)
Unamortized debt issuance costs						(16)					(13)
Total Long-term Debt						2,623					2,321
Less current portion of Long-term debt						500					96
Long-term Debt						2,123					2,225
Aggregate maturities of long-term debt (Details) [Abstract]
2019						500
2020						132
2021						0
2022						13
2023						0
Thereafter						$ 1,997
Kentucky Utilities Co [Member] \| Environmental Facilities Revenue Bonds, 2004 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 50
Stated interest rate	1.75%							1.75%
Kentucky Utilities Co [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 96
Stated interest rate	1.55%							1.55%
Kentucky Utilities Co [Member] \| Environmental Facilities Revenue Bonds, 2006 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 54
Stated interest rate	1.20%							1.20%
Kentucky Utilities Co [Member] \| Environmental Facilities Revenue Bonds, 2008 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 78
Stated interest rate	1.20%							1.20%
Kentucky Utilities Co [Member] \| Solid Waste Disposal Facility Revenue Bonds, 2000 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 13
Stated interest rate	1.30%							1.30%
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.93%	3.93%
Principal outstanding						$ 2,642					2,342
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						$ 6,600					$ 6,300
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member] \| Tax Exempt Revenue Bonds [Member]
Long-term Debt (Numeric) [Abstract]
Minimum length of time to convert interest rate mode						1 year
Aggregate amount of tax-exempt revenue bonds in a term rate mode						$ 308
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						$ 33
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount			$ 300
Stated interest rate			4.375%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt			$ 303