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Pension and Other Postretirement Benefits (OPEB) - Schedule of Pension and OPEB Costs (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) $ 18 $ 18 $ 55 $ 52
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) 11 11 35 32
Pension Benefits [Member] | PSEG Power & Other        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) 7 7 20 20
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) 1 1 2 4
OPEB [Member] | Public Service Electric and Gas Company [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) (1) (0) (3) (1)
OPEB [Member] | PSEG Power & Other        
Defined Benefit Plan Disclosure [Line Items]        
Total Net Periodic Benefit Costs (Credits) $ 2 $ 1 $ 5 $ 5