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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 mi | Jul. 31, 2014 claim | Dec. 31, 2013 resident | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 01, 2015
Claim By Former Affiliate [Abstract] |  |  |  |  |  |
Percent of ownership of Talen Energy by Riverstone |  |  |  |  |  | 35.00%
PPL Electric [Member] | PPL Electric Additional Sites [Member] |  |  |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ |  |  |  | $ 10 | $ 10 |
LGE [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of residents that filed class action suit | resident |  |  | 6 |  |  |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  | 1 |  |  |  |
LGE [Member] | Minimum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | 1 |  |  |  |  |
LGE [Member] | Maximum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | 3 |  |  |  |  |
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ |  |  |  | $ 10 | $ 10 |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of residents that filed class action suit | resident |  |  | 6 |  |  |
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim |  | 1 |  |  |  |
Louisville Gas And Electric Co [Member] | Minimum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | 1 |  |  |  |  |
Louisville Gas And Electric Co [Member] | Maximum [Member] |  |  |  |  |  |
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract] |  |  |  |  |  |
Number of miles within plant that would include a class of residents | 3 |  |  |  |  |

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- Definition Initial ownership percentage in new company, Talen Energy, by Riverstone Holdings, LLC upon completion of spinoff transaction. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References 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 + Details
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