Financing Activities - Credit Arrangements (Details) £ in Millions, $ in Millions	Jun. 30, 2019 USD ($)	Jun. 30, 2019 GBP (£)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 GBP (£)
UNITED KINGDOM
Line of Credit Facility [Line Items]
Capacity | £		£ 1,155
Borrowed | £		272		£ 195
Letters of Credit and Commercial Paper Issued | £		4		4
Unused Capacity	$ 1,100	879
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	158	$ 200	157
Letters of Credit and Commercial Paper Issued | £		0		£ 0
Unused Capacity | £		£ 52
Interest rate on outstanding borrowing	3.25%	3.25%	3.17%	3.17%
WPD South West [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £		£ 245
Borrowed | £		0		£ 0
Letters of Credit and Commercial Paper Issued | £		0		0
Unused Capacity | £		245
WPD East Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £		300
Borrowed	$ 102	81	$ 48	38
Letters of Credit and Commercial Paper Issued | £		0		£ 0
Unused Capacity | £		£ 219
Interest rate on outstanding borrowing	1.13%	1.13%	1.12%	1.12%
WPD West Midlands [Member] | UNITED KINGDOM | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity | £		£ 300
Borrowed	$ 41	33		£ 0
Letters of Credit and Commercial Paper Issued | £		0		£ 0
Unused Capacity | £		£ 267
Interest rate on outstanding borrowing	1.13%	1.13%
PPL Capital Funding [Member] | UNITED STATES
Line of Credit Facility [Line Items]
Capacity	$ 1,550
Borrowed	0		$ 0
Letters of Credit and Commercial Paper Issued	1,029		684
Unused Capacity	521
PPL Capital Funding [Member] | UNITED STATES | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	1,450
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	1,014		669
Unused Capacity	436
PPL Capital Funding [Member] | UNITED STATES | Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	100
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	15		15
Unused Capacity	85
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	186		1
Unused Capacity	464
LGE [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	96		279
Unused Capacity	404
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	96		279
Unused Capacity	404
LGE [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	0		0
Unused Capacity	0
KU [Member]
Line of Credit Facility [Line Items]
Capacity	598
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		433
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		235
Unused Capacity	400
KU [Member] | Letter Of Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	198
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		198
Unused Capacity	0
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	186		1
Unused Capacity	464
LG And E And KU Energy LLC [Member] | LGE [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	96		279
Unused Capacity	404
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	96		279
Unused Capacity	404
LG And E And KU Energy LLC [Member] | LGE [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	0		0
Unused Capacity	0
LG And E And KU Energy LLC [Member] | KU [Member]
Line of Credit Facility [Line Items]
Capacity	598
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		433
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		235
Unused Capacity	400
LG And E And KU Energy LLC [Member] | KU [Member] | Letter Of Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	198
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		198
Unused Capacity	0
Louisville Gas And Electric Co [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	96		279
Unused Capacity	404
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	96		279
Unused Capacity	404
Louisville Gas And Electric Co [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0		200
Letters of Credit and Commercial Paper Issued	0		0
Unused Capacity	0
Kentucky Utilities Co [Member]
Line of Credit Facility [Line Items]
Capacity	598
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		433
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		235
Unused Capacity	400
Kentucky Utilities Co [Member] | Letter Of Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	198
Borrowed	0		0
Letters of Credit and Commercial Paper Issued	198		$ 198
Unused Capacity	$ 0