Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions	Mar. 31, 2018 USD ($) Potentially_Responsible_Party entity site Station Plant mi	Dec. 31, 2017 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	17
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination | entity	11
Number of operating electric generating stations located on Hackensack River | Station	2
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination | site	1
PSE And G [Member]
Site Contingency [Line Items]
Percentage of cost attributable to potentially responsible party	7.60%
Pse G S Former Mgp Sites [Member] | Power [Member]
Site Contingency [Line Items]
Percentage of cost attributable to potentially responsible party	1.90%
Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Estimated Cleanup Costs EPA Preferred Method	$ 2,300
Accrual for Environmental Loss Contingencies	$ 57
Number Of Additional Potentially Responsible Parties Directed By New Jersey Department Of Environmental Protection To Arrange Damage Assessment For Lower Passaic River | Potentially_Responsible_Party	56
Estimated cost of interim natural resource injury restoration	$ 950
Passaic River Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Number of former generating electric station | Plant	1
Number of former Manufactured Gas Plant (MGP) sites | Plant	4
Accrual for Environmental Loss Contingencies	$ 46
Passaic River Site Contingency [Member] | Power [Member]
Site Contingency [Line Items]
Accrual for Environmental Loss Contingencies	11
Mgp Remediation Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Remediation Liability Recorded As Other Current Liabilities	79
Remediation Liability Recorded As Other Noncurrent Liabilities	266
Regulatory Assets	345
Minimum [Member] | Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	518
Minimum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	345
Accrual for Environmental Loss Contingencies	345
Maximum [Member] | Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	3,200
Maximum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 391