Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions	Jun. 30, 2020 GBP (£)	Jun. 30, 2020 USD ($)	Apr. 01, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)
UNITED KINGDOM
Line of Credit Facility [Line Items]
Capacity | £	£ 1,155
Borrowed | £	266				£ 243
Letters of Credit and Commercial Paper Issued | £	4				4
Unused Capacity	885	$ 1,100
UNITED KINGDOM | Uncommitted Credit Facilities [Member]
Line of Credit Facility [Line Items]
Capacity | £	100
Borrowed	60	$ 74			0
Letters of Credit and Commercial Paper Issued | £	4				4
Unused Capacity | £	£ 36
Interest rate on outstanding borrowing	1.35%	1.35%
WPD PLC [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	£ 210
Borrowed	162	$ 200			155	$ 200
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	£ 48
Interest rate on outstanding borrowing	1.00%	1.00%			2.52%	2.52%
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	£ 220
Borrowed	0				£ 40	$ 51
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	220
Interest rate on outstanding borrowing					1.09%	1.09%
WPD South Wales [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	125
Borrowed	5	$ 6			£ 0
Letters of Credit and Commercial Paper Issued | £	0				0
Unused Capacity | £	£ 120
Interest rate on outstanding borrowing	0.60%	0.60%
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	£ 250
Borrowed | £	0				0
Letters of Credit and Commercial Paper Issued | £	0				0
Unused Capacity | £	250
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	250
Borrowed	39	$ 48			48	$ 62
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	£ 211
Interest rate on outstanding borrowing	0.60%	0.60%			1.11%	1.11%
PPL Capital Funding [Member]
Line of Credit Facility [Line Items]
Capacity		$ 1,950
Borrowed		400				$ 0
Letters of Credit and Commercial Paper Issued		15				465
Unused Capacity		$ 1,535
Interest rate on outstanding borrowing	1.04%	1.04%
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 1,450
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				450
Unused Capacity		1,450
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity		200	$ 100	$ 200
Borrowed		200	$ 100	$ 200		0
Letters of Credit and Commercial Paper Issued		0				0
Unused Capacity		0
Interest rate on outstanding borrowing			1.73%	1.96%
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity		100
Borrowed		100				0
Letters of Credit and Commercial Paper Issued		0				0
Unused Capacity		0
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity		100
Borrowed		100				0
Letters of Credit and Commercial Paper Issued		0				0
Unused Capacity		0
PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		50
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				0
Unused Capacity		50
PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		50
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		15				15
Unused Capacity		35
PPL Electric [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		650
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		201				1
Unused Capacity		449
LGE [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
KU [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				150
Unused Capacity		400
KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				150
Unused Capacity		400
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		650
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		201				1
Unused Capacity		449
LG And E And KU Energy LLC [Member] | LGE [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
LG And E And KU Energy LLC [Member] | KU [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				150
Unused Capacity		400
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				150
Unused Capacity		400
Louisville Gas And Electric Co [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				238
Unused Capacity		500
Kentucky Utilities Co [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				150
Unused Capacity		400
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		0				$ 150
Unused Capacity		$ 400