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Fair Value Measurements - Schedule of Fair Value of Debt (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-Term Debt, Carrying Amount |  | $ 22,541 | $ 21,114
Long-Term Debt, Fair Value |  | 21,441 | 19,341
Public Service Electric and Gas Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-Term Debt, Carrying Amount | [1] | 15,990 | 14,998
Long-Term Debt, Fair Value | [1] | 14,780 | 13,337
PSEG Power |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-Term Debt, Carrying Amount | [1],[2] | 1,237 | 1,250
Long-Term Debt, Fair Value | [1],[2] | 1,294 | 1,250
PSEG [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-Term Debt, Carrying Amount | [1] | 5,314 | 4,866
Long-Term Debt, Fair Value | [1] | $ 5,367 | $ 4,754
[1] | Given that these bonds do not trade actively, the fair value amounts of taxable debt securities (primarily Level 2 measurements) are generally determined by a valuation model using market-based measurements that are processed through a rules-based pricing methodology. The fair value amounts above do not represent the price at which the outstanding debt may be called for redemption by each issuer under their respective debt agreements.
[2] | As of December 31, 2024, PSEG Power had a private term loan with book value approximating fair value (Level 2 measurement).

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