Financing Activities - Credit Arrangements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
PPL Capital Funding [Member]
Line of Credit Facility [Line Items]
Capacity	$ 1,550
Borrowed	0	$ 400
Letters of Credit and Commercial Paper Issued	15	417
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	402
Unused Capacity	1,450
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0	100
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	0
Borrowed	0	100
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	0
Borrowed	0	200
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	15	15
Unused Capacity	35
PPL Capital Funding [Member] | Bilateral Credit Facility #2
Line of Credit Facility [Line Items]
Capacity	50
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	0	0
Unused Capacity	50
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	1	1
Unused Capacity	649
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	262
Unused Capacity	500
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	203
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	1	1
Unused Capacity	649
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	262
Unused Capacity	500
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	$ 203
Unused Capacity	$ 400