Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions	Sep. 30, 2021 USD ($) Plant mi
Site Contingency [Line Items]
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | mi	17
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination	11
Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Estimated Cleanup Costs EPA Preferred Method	$ 2,300
Accrual for Environmental Loss Contingencies	$ 66
Number Of Additional Potentially Responsible Parties Directed By New Jersey Department Of Environmental Protection To Arrange Damage Assessment For Lower Passaic River	56
Passaic River Site Contingency [Member] | Public Service Electric and Gas Company [Member]
Site Contingency [Line Items]
Number of former generating electric station | Plant	1
Accrual for Environmental Loss Contingencies	$ 53
Passaic River Site Contingency [Member] | PSEG Power [Member]
Site Contingency [Line Items]
Accrual for Environmental Loss Contingencies	$ 13
Pse G S Former Mgp Sites [Member]
Site Contingency [Line Items]
Aggregate Number Of Mgp Sites Identified For Cleanup By New Jersey Department Of Environmental Protection	38
Mgp Remediation Site Contingency [Member] | Public Service Electric and Gas Company [Member]
Site Contingency [Line Items]
Remediation Liability Recorded As Other Current Liabilities	$ 53
Remediation Liability Recorded As Other Noncurrent Liabilities	190
Regulatory Assets	243
Minimum [Member] | Mgp Remediation Site Contingency [Member] | Public Service Electric and Gas Company [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	243
Accrual for Environmental Loss Contingencies	243
Maximum [Member] | Mgp Remediation Site Contingency [Member] | Public Service Electric and Gas Company [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 271