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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 01, 2015
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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 | $ 11 | $ 10 |
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |
Claim By Former Affiliate [Abstract] |  |  |
Accrual for Environmental Loss Contingencies | $ 11 | $ 10 |

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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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