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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Mar. 04, 2025 | Feb. 21, 2025 | Dec. 31, 2024
Claim By Former Affiliate [Abstract] |  |  |  |
Period Over Which Distribution Adjustment Charge-related Costs Are amortized | 10 years |  |  |
Rhode Island Division Of Public Utilities And Carriers Amount To Be Refunded To The RIE Energy Efficiency Program |  | $ 10 | $ 12 |
Rhode Island Division Of Public Utilities And Carriers Amount Already Credited To The RIE Energy Efficiency Program |  | 2 |  |
Rhode Island Division Of Public Utilities And Carriers Amount To Be Recorded As A Reduction To The Storm Contingency Fund Balance |  | $ 8 |  |
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 | 98 |  |  | $ 98
PPL Electric [Member] | PPL Electric Additional Sites [Member] |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Accrual for Environmental Loss Contingencies, Gross | 8 |  |  | 8
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member] |  |  |  |
Claim By Former Affiliate [Abstract] |  |  |  |
Accrual for Environmental Loss Contingencies, Gross | $ 8 |  |  | $ 8

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