Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Potentially_Responsible_Party site entity Station Plant mi	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Site Contingency [Line Items]
Percentage of residential gas supply permitted to be recovered in gas hedging by BPU	80.00%
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | mi	17
Number of 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
Accrued environmental costs	$ 327	$ 357
Operation and Maintenance	3,015	2,901	$ 2,991
New England Generation Fleet	12,744	12,250
Clean Energy Program Current	$ 143	128
PSE&G [Member]
Site Contingency [Line Items]
Percentage Of Cost Attributable To Potentially Responsible Party	7.60%
Accrued environmental costs	$ 268	283
Regulatory Assets	3,788	3,433
Operation and Maintenance	1,575	1,458	1,465
New England Generation Fleet	623	593
Clean Energy Program Current	143	128
Power [Member]
Site Contingency [Line Items]
Operation and Maintenance	999	1,046	$ 1,139
New England Generation Fleet	12,121	$ 11,657
MGP Remediation Site Contingency [Member] | PSE&G [Member]
Site Contingency [Line Items]
Remediation liability recorded as other current liabilities	56
Remediation liability recorded as environmental costs in noncurrent liabilities	265
Regulatory Assets	$ 321
PSE&G's Former MGP Sites [Member]
Site Contingency [Line Items]
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action | site	38
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
Aggregate number of PRPs directed by the NJDEP to arrange for natural resource damage assessment and interim compensatory restoration along the lower Passaic River | Potentially_Responsible_Party	56
Estimated cost of interim natural resource injury restoration	$ 950
Accrual for Environmental Loss Contingencies	$ 57
Passaic River Site Contingency [Member] | Transferred To Power From PSE&G [Member]
Site Contingency [Line Items]
Number of operating electric generating station (Essex Site) | Plant	1
Passaic River Site Contingency [Member] | PSE&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
Minimum [Member] | MGP Remediation Site Contingency [Member] | PSE&G [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	321
Accrual for Environmental Loss Contingencies	321
Minimum [Member] | Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	518
Maximum [Member] | MGP Remediation Site Contingency [Member] | PSE&G [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	366
Maximum [Member] | Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	3,200
Claim against Tierra and Maxus amount	$ 14,000