v3.26.1
Fair Value Measurements - Schedule of Fair Value of Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt, Carrying Amount $ 23,090 $ 22,545
Long-Term Debt, Fair Value 21,576 21,364
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] 16,535 15,992
Long-Term Debt, Fair Value [1] 15,000 14,705
PSEG Power    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt, Carrying Amount [1] 1,238 1,238
Long-Term Debt, Fair Value [1] 1,271 1,288
PSEG [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt, Carrying Amount [1] 5,317 5,315
Long-Term Debt, Fair Value [1] $ 5,305 $ 5,371
[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.