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The amount of tax-exempt revenue bonds with a term rate mode at the end of the period.

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The amount of tax-exempt revenue bonds with a variable rate mode at the end of the period.

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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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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions			1 Months Ended			12 Months Ended
	Oct. 01, 2020 USD ($)	Oct. 01, 2020 GBP (£)	Oct. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 GBP (£)	Oct. 01, 2020 GBP (£)	Sep. 01, 2020 USD ($)	Aug. 01, 2020 USD ($)	Jun. 01, 2020 USD ($)	Apr. 01, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Principal outstanding						$ 23,249									$ 22,002
Unamortized premium and (discount), net						2									5
Unamortized debt issuance costs						(132)									(126)
Total Long-term Debt						23,127									21,893
Less current portion of Long-term debt						1,574									1,172
Long-term Debt						21,553									20,721
Aggregate maturities of long-term debt (Details) [Abstract]
2021						1,574
2022						1,374
2023						2,552
2024						950
2025						883
Thereafter						15,916
WPD [Member] \| Senior Notes [Member] \| Senior Notes Due 2021 [Member] \| Intent to Redeem [Member] \| Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount							$ 500
Stated interest rate							5.375%
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						441		£ 331
WPD South Wales [Member] \| Senior Notes [Member] \| Senior Notes Due 2020 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount \| £									£ 150
Stated interest rate	9.25%								9.25%
WPD South Wales [Member] \| Senior Notes [Member] \| Senior Notes Due 2035 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount \| £									£ 250
Stated interest rate	1.625%								1.625%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt	$ 319	£ 247
PPL Capital Funding [Member] \| Term Loan Credit Facility [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity													$ 100	$ 200
Interest rate on outstanding borrowing													173.00%	1.96%
PPL Capital Funding [Member] \| Term Loan Credit Facility [Member] \| Term Loan Due 2022 [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity													$ 100
Interest rate on outstanding borrowing													1.72%
PPL Capital Funding [Member] \| Senior Notes [Member] \| Senior Notes Due 2030 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount													$ 1,000
Stated interest rate													4.125%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Secured Debt					$ 993
PPL Electric [Member] \| Pollution Control Revenue Refunding Bonds [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate	0.40%								0.40%
PPL Electric [Member] \| Pollution Control Revenue Refunding Bonds, 2008 Series [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 90
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						10,800									10,100
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, Floating Rate Series due 2023 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 250
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Debt			$ 249
LGE [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						$ 500
LGE [Member] \| First Mortgage Bonds [Member] \| 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						$ 5,500									5,300
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
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						$ 848
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						33
LKE [Member] \| Senior Notes [Member] \| Senior Notes Due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount											$ 475
Stated interest rate											3.75%
KU [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						400
KU [Member] \| First Mortgage Bonds [Member] \| 2010 Mortgage Indenture [Member]
Long-term Debt (Numeric) [Abstract]
Aggregate carrying value of property subject to lien						$ 6,700									6,600
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 Bonds Due 2050 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount												$ 500
Stated interest rate												3.30%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of First Mortgage Bond				$ 493
KU [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount											$ 500
Stated interest rate											3.25%
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						$ 13		£ 10
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										$ 23
Stated interest rate										0.90%
LOUISVILLE GAS And ELECTRIC CO [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 125
Stated interest rate										1.30%
U.S. [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 14,835									13,960
U.S. [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.95%		3.95%
Principal outstanding						$ 4,850									4,325
U.S. [Member] \| Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.81%		3.81%
Principal outstanding						$ 8,955									8,705
U.S. [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Potential To Be Called Within One Year [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 250
U.S. [Member] \| Junior Subordinated Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						4.35%		4.35%
Principal outstanding						$ 930									930
U.S. [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						0.85%		0.85%
Principal outstanding						$ 100									0
U.S. [Member] \| PPL Capital Funding [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						1,950
U.S. [Member] \| PPL Capital Funding [Member] \| Term Loan Credit Facility [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						200
U.K. [Member]
Debt Instrument [Line Items]
Principal outstanding						8,414									8,042
Fair market value adjustments						$ 8									12
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity \| £								£ 1,155
U.K. [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						4.69%		4.69%
Principal outstanding						$ 7,197									6,874
Long-term Debt (Numeric) [Abstract]
Principal amount that may be redeemed in total but not in part						$ 300		£ 225
U.K. [Member] \| Term Loan Credit Facility [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						1.46%		1.46%
Principal outstanding						$ 67									64
U.K. [Member] \| Index-linked Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						1.42%		1.42%
Principal outstanding						$ 1,150									1,104
U.K. [Member] \| Long-term Debt [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount that may be put back to the issuer						7,700		£ 5,800
PPL Electric Utilities Corp [Member]
Debt Instrument [Line Items]
Principal outstanding						4,289									4,039
Unamortized discount						(23)									(24)
Unamortized debt issuance costs						(30)									(30)
Total Long-term Debt						4,236									3,985
Less current portion of Long-term debt						400									0
Long-term Debt						3,836									3,985
Aggregate maturities of long-term debt (Details) [Abstract]
2021						400
2022						474
2023						340
2024						0
2025						0
Thereafter						$ 3,075
PPL Electric Utilities Corp [Member] \| Pollution Control Revenue Refunding Bonds [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Stated interest rate	0.40%								0.40%
PPL Electric Utilities Corp [Member] \| Pollution Control Revenue Refunding Bonds, 2008 Series [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 90
PPL Electric Utilities Corp [Member] \| Senior Secured Notes - First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.79%		3.79%
Principal outstanding						$ 4,289									4,039
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						10,800									10,100
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] \| First Mortgage Bonds, Floating Rate Series due 2023 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 250
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of Debt			$ 249
LG And E And KU Energy LLC [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 6,116									6,041
Debt Instrument, Unamortized Premium						5									5
Unamortized discount						(13)									(12)
Unamortized debt issuance costs						(34)									(32)
Total Long-term Debt						6,074									6,002
Less current portion of Long-term debt						674									975
Long-term Debt						5,400									5,027
Aggregate maturities of long-term debt (Details) [Abstract]
2021						674
2022						0
2023						13
2024						0
2025						550
Thereafter						$ 4,879
LG And E And KU Energy LLC [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						4.38%		4.38%
Principal outstanding						$ 250									725
LG And E And KU Energy LLC [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Potential To Be Called Within One Year [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 250
LG And E And KU Energy LLC [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.82%		3.82%
Principal outstanding						$ 4,666									4,666
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						848
Aggregate amount of tax-exempt revenue bonds in a variable rate mode						$ 33
LG And E And KU Energy LLC [Member] \| PPL Affiliate [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.89%		3.89%
Principal outstanding						$ 1,200									650
LG And E And KU Energy LLC [Member] \| Senior Notes [Member] \| Senior Notes Due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount											$ 475
Stated interest rate											3.75%
LG And E And KU Energy LLC [Member] \| LGE [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						500
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						$ 5,500									5,300
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] \| KU [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Capacity						$ 400
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						$ 6,700									6,600
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 Bonds Due 2050 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount												$ 500
Stated interest rate												3.30%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of First Mortgage Bond				493
LG And E And KU Energy LLC [Member] \| KU [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount											$ 500
Stated interest rate											3.25%	3.25%
LG And E And KU Energy LLC [Member] \| 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										$ 23
Stated interest rate										0.90%
LG And E And KU Energy LLC [Member] \| LOUISVILLE GAS And ELECTRIC CO [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 125
Stated interest rate										1.30%
LOUISVILLE GAS And ELECTRIC CO [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 2,024									2,024
Unamortized discount						(4)									(4)
Unamortized debt issuance costs						(13)									(15)
Total Long-term Debt						2,007									2,005
Less current portion of Long-term debt						292									0
Long-term Debt						1,715									2,005
Aggregate maturities of long-term debt (Details) [Abstract]
2021						292
2022						0
2023						0
2024						0
2025						300
Thereafter						1,432
Capacity						500
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										$ 23
Stated interest rate										0.90%
LOUISVILLE GAS And ELECTRIC CO [Member] \| Pollution Control Revenue Bonds, 2016 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount										$ 125
Stated interest rate										1.30%
LOUISVILLE GAS And ELECTRIC CO [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Potential To Be Called Within One Year [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 250
LOUISVILLE GAS And ELECTRIC CO [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.69%		3.69%
Principal outstanding						$ 2,024									2,024
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						$ 5,500									5,300
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						$ 539
Kentucky Utilities Co [Member]
Debt Instrument [Line Items]
Principal outstanding						2,642									2,642
Debt Instrument, Unamortized Premium						5									5
Unamortized discount						(9)									(8)
Unamortized debt issuance costs						(20)									(16)
Total Long-term Debt						2,618									2,623
Less current portion of Long-term debt						132									500
Long-term Debt						2,486									2,123
Aggregate maturities of long-term debt (Details) [Abstract]
2021						132
2022						0
2023						13
2024						0
2025						250
Thereafter						2,247
Capacity						400
Kentucky Utilities Co [Member] \| Senior Secured Notes - First Mortgage Bonds [Member] \| Potential To Be Called Within One Year [Member]
Debt Instrument [Line Items]
Principal outstanding						$ 250
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-Average Rate						3.92%		3.92%
Principal outstanding						$ 2,642									2,642
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						$ 6,700									$ 6,600
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						$ 309
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds Due 2050 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount												$ 500
Stated interest rate												3.30%
Aggregate maturities of long-term debt (Details) [Abstract]
Proceeds from Issuance of First Mortgage Bond				$ 493
Kentucky Utilities Co [Member] \| First Mortgage Bonds [Member] \| First Mortgage Bonds due 2020 [Member] \| Debt Instrument, Redemption, Period One [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount											$ 500
Stated interest rate											3.25%	3.25%