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Fair Value Measurements - PSEG's and PSE&G's Respective Assets and (Liabilities) Measured at Fair Value on a Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and foreign currency excluded from Fair Value | $ 24 | $ 1

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