Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended			30 Months Ended	39 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2015	Mar. 31, 2015
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense			$ 2,978	$ 3,150	$ 2,887
Insured Event, Gain (Loss)			28
New Jersey Clean Energy Program [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program			345
Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Proceeds from insurance recoveries	$ 55	$ 159	214			$ 264
PSE&G [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense			1,560	1,558	1,639
Insured Event, Gain (Loss)			0
PSE&G [Member] | New Jersey Clean Energy Program [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program			200
PSE&G [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense			(10)		40
Costs incurred to restore service					295
Utilities, Costs Incurred to Restore Service portion attributable to insured property					36
Utilities, Costs Incurred to Repair Infrastructure to Pre-Storm Conditions					5
Cost recorded as Property, Plant and Equipment			(11)		75
Costs recorded as Regulatory Asset			(20)		180
Proceeds from insurance recoveries			35		6
Power [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense			1,057	1,186	1,224
Insured Event, Gain (Loss)			28
Power [Member] | Regulatory Agency [Domain]
Loss Contingencies [Line Items]
Loss Contingency, Loss in Period				$ 25
Power [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense			2				$ 193
Proceeds from insurance recoveries			179		$ 44
Property, Plant and Equipment [Member] | Power [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Insured Event, Gain (Loss)			6
Operation and Maintenance Expense [Member] | Power [Member]
Loss Contingencies [Line Items]
Insured Event, Gain (Loss)			145
Other Income [Member] | Power [Member]
Loss Contingencies [Line Items]
Insured Event, Gain (Loss)			$ 28