Financing Activities - Credit Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
PPL Capital Funding [Member]
Line of Credit Facility [Line Items]
Capacity	$ 1,650
Borrowed	100	$ 400
Letters of Credit and Commercial Paper Issued	957	417
Unused Capacity	593
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	942	402
Unused Capacity	508
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	100
Borrowed	100	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	206	1
Unused Capacity	444
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	252	262
Unused Capacity	248
KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	400
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	148	203
Unused Capacity	252
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	206	1
Unused Capacity	444
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	252	262
Unused Capacity	248
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	148	203
Unused Capacity	252
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	252	262
Unused Capacity	248
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	148	$ 203
Unused Capacity	$ 252