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Net Other Income (Deductions) - Schedule of Net Other Income (Deductions) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Component of Other Income (Deductions) [Line Items]        
Total Net Other Income (Deductions) $ 39 $ 37 $ 122 $ 119
Public Service Electric and Gas Company [Member]        
Component of Other Income (Deductions) [Line Items]        
NDT Fund Interest and Dividends 0 0 0 0
Allowance for Funds Used During Construction 12 11 33 31
Solar Loan Interest   1 2 4
Other Interest 3 4 10 7
Other 1 2 3 8
Total Net Other Income (Deductions) 16 18 48 50
PSEG Power & Other        
Component of Other Income (Deductions) [Line Items]        
NDT Fund Interest and Dividends [1] 22 21 67 61
Allowance for Funds Used During Construction [1] 0 0 0 0
Solar Loan Interest [1]   0 0 0
Other Interest [1] 4 3 16 19
Other [1] (3) (5) (9) (11)
Total Net Other Income (Deductions) [1] 23 19 74 69
PSEG Power        
Component of Other Income (Deductions) [Line Items]        
NDT Fund Interest and Dividends 22 21 67 61
Allowance for Funds Used During Construction 12 11 33 31
Solar Loan Interest   1 2 4
Other Interest 7 7 26 26
Other (2) (3) (6) (3)
Total Net Other Income (Deductions) $ 39 $ 37 $ 122 $ 119
[1] PSEG Power & Other consists of activity at PSEG Power, Energy Holdings, PSEG LI, Services, PSEG (parent company) and intercompany eliminations.