Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions	Apr. 01, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 GBP (£)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)
UNITED KINGDOM
Line of Credit Facility [Line Items]
Capacity | £			£ 1,155
Borrowed | £			210		£ 243
Letters of Credit and Commercial Paper Issued | £			4		4
Unused Capacity		$ 1,200	943
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		$ 200	156	$ 200	155
Letters of Credit and Commercial Paper Issued | £			0		£ 0
Unused Capacity | £			£ 56
Interest rate on outstanding borrowing		2.43%	2.43%	2.52%	2.52%
Borrowed | £			£ 154
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £			245
Borrowed			0	$ 51	£ 40
Letters of Credit and Commercial Paper Issued | £			0		£ 0
Unused Capacity | £			245
Interest rate on outstanding borrowing				1.09%	1.09%
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £			300
Borrowed | £			0		£ 0
Letters of Credit and Commercial Paper Issued | £			0		0
Unused Capacity | £			300
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £			300
Borrowed		$ 69	54	$ 62	48
Letters of Credit and Commercial Paper Issued | £			0		£ 0
Unused Capacity | £			£ 246
Interest rate on outstanding borrowing		1.11%	1.11%	1.11%	1.11%
PPL Capital Funding [Member]
Line of Credit Facility [Line Items]
Capacity		$ 1,750
Borrowed		859		$ 0
Letters of Credit and Commercial Paper Issued		195		465
Unused Capacity		$ 696
Interest rate on outstanding borrowing		1.97%	1.97%
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 1,450
Borrowed		575		0
Letters of Credit and Commercial Paper Issued		180		450
Unused Capacity		695
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity		200
Borrowed		200		0
Letters of Credit and Commercial Paper Issued		0		0
Unused Capacity		$ 0
Interest rate on outstanding borrowing		1.96%	1.96%
PPL Capital Funding [Member] | Term Loan Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Capacity	$ 100
Borrowed	$ 100
Interest rate on outstanding borrowing	1.73%
PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 50
Borrowed		50		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		34		0
Letters of Credit and Commercial Paper Issued		15		15
Unused Capacity		$ 1
PPL Electric [Member]
Line of Credit Facility [Line Items]
Interest rate on outstanding borrowing		1.96%	1.96%
PPL Electric [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 650
Borrowed		85		0
Letters of Credit and Commercial Paper Issued		1		1
Unused Capacity		564
LGE [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		$ 341
Interest rate on outstanding borrowing		1.81%	1.81%
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		341
KU [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		150
Unused Capacity		$ 256
Interest rate on outstanding borrowing		1.81%	1.81%
KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		150
Unused Capacity		$ 256
PPL Electric Utilities Corp [Member]
Line of Credit Facility [Line Items]
Interest rate on outstanding borrowing		1.96%	1.96%
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 650
Borrowed		85		0
Letters of Credit and Commercial Paper Issued		1		1
Unused Capacity		564
LG And E And KU Energy LLC [Member] | LGE [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		$ 341
Interest rate on outstanding borrowing		1.81%	1.81%
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		341
LG And E And KU Energy LLC [Member] | KU [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		150
Unused Capacity		$ 256
Interest rate on outstanding borrowing		1.81%	1.81%
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		150
Unused Capacity		256
Louisville Gas And Electric Co [Member]
Line of Credit Facility [Line Items]
Capacity		500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		$ 341
Interest rate on outstanding borrowing		1.81%	1.81%
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 500
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		59		238
Unused Capacity		341
Kentucky Utilities Co [Member]
Line of Credit Facility [Line Items]
Capacity		400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		150
Unused Capacity		$ 256
Interest rate on outstanding borrowing		1.81%	1.81%
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity		$ 400
Borrowed		100		0
Letters of Credit and Commercial Paper Issued		44		$ 150
Unused Capacity		$ 256