Pension, OPEB and Savings Plans (Schedule Of Pension And OPEB Costs) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 168	$ 94	$ 174
Pension Benefits [Member] | Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	52	29	54
Pension Benefits [Member] | PSE&G [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	97	51	97
Pension Benefits [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	19	14	23
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	103	81	141
Other Benefits [Member] | Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	18	12	17
Other Benefits [Member] | PSE&G [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	82	67	120
Other Benefits [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 3	$ 2	$ 4