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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 18, 2014 | Sep. 30, 2023 | Dec. 31, 2022 | Jun. 01, 2015
Claim By Former Affiliate [Abstract] |  |  |  |
Percent of ownership of Talen Energy by Riverstone |  |  |  | 35.00%
Period Over Which Distribution Adjustment Charge-related Costs Are amortized |  | 10 years |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 900 |  |  |
Electric Rates |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Environmental Costs Recognized, Recovery Credited to Expense |  | $ 3 |  |
Gas Rates |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Environmental Costs Recognized, Recovery Credited to Expense |  | 1 |  |
RIE Environmental Remediation |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  | 100 | $ 100 |
PPL Electric [Member] | PPL Electric Additional Sites [Member] |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  | 11 | 11 |
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  | $ 11 | $ 11 |

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