v3.26.1
Pension and Other Postretirement Benefits (OPEB) - Schedule of Pension and OPEB Costs (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) $ 8 $ 18
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) 4 12
Pension Benefits [Member] | PSEG Power & Other    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) 4 6
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) (2) 1
OPEB [Member] | Public Service Electric and Gas Company [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) (3) (1)
OPEB [Member] | PSEG Power & Other    
Defined Benefit Plan Disclosure [Line Items]    
Total Net Periodic Benefit Costs (Credits) $ 1 $ 2