Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense	$ 3,008	$ 2,978	$ 3,150
Insured Event, Gain (Loss)		28
PSE&G [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense	1,475	1,560	1,558
Insured Event, Gain (Loss)		0
Power [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense	$ 1,143	1,057	$ 1,186
Insured Event, Gain (Loss)		28
Power [Member] | Regulatory Agency [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Loss in Period		$ 25