Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions	Sep. 30, 2020 GBP (£)	Sep. 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 | £	332				£ 243
Letters of Credit and Commercial Paper Issued | £	4				4
Unused Capacity	817	$ 1,100
UNITED KINGDOM | Uncommitted Credit Facilities [Member]
Line of Credit Facility [Line Items]
Capacity | £	100
Borrowed | £	0				0
Letters of Credit and Commercial Paper Issued | £	4				4
Unused Capacity | £	96
WPD PLC [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	210
Borrowed	150	$ 200			155	$ 200
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	£ 58
Interest rate on outstanding borrowing	0.98%	0.98%			2.52%	2.52%
Borrowed | £	£ 152
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	220
Borrowed	118	$ 158			£ 40	$ 51
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	£ 102
Interest rate on outstanding borrowing	0.56%	0.56%			1.09%	1.09%
WPD South Wales [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £	£ 125
Borrowed | £	0				£ 0
Letters of Credit and Commercial Paper Issued | £	0				0
Unused Capacity | £	125
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	64	$ 86			48	$ 62
Letters of Credit and Commercial Paper Issued | £	0				£ 0
Unused Capacity | £	£ 186
Interest rate on outstanding borrowing	0.56%	0.56%			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
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		281				1
Unused Capacity		369
LGE [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		206				238
Unused Capacity		294
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		206				238
Unused Capacity		294
KU [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		139				150
Unused Capacity		261
KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		139				150
Unused Capacity		261
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		281				1
Unused Capacity		369
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		206				238
Unused Capacity		294
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		206				238
Unused Capacity		294
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		139				150
Unused Capacity		261
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		139				150
Unused Capacity		261
Louisville Gas And Electric Co [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		206				238
Unused Capacity		294
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		206				238
Unused Capacity		294
Kentucky Utilities Co [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		0				0
Letters of Credit and Commercial Paper Issued		139				150
Unused Capacity		261
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		139				$ 150
Unused Capacity		$ 261