Commitments and Contingencies - Environmental Matters and Other (Details) $ in Millions	9 Months Ended
Sep. 30, 2021 USD ($) vote	Dec. 31, 2020 USD ($)
PPL Electric [Member] \| PPL Electric Additional Sites [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies	$ 10	$ 10
PPL Electric Utilities Corp [Member] \| PPL Electric Additional Sites [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies	$ 10	$ 10
Kentucky Utilities Co [Member]
Other - Labor Union Agreements (Numeric) [Abstract]
Concentration Risk Number Of Union Employees \| vote	70

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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