Long-Term Investments (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Long-Term Investments [Line Items]
Total Long-Term Investments	$ 1,324		$ 1,303
Dividends in equity method investments	17		3		5
Share of income and cash flow distribution percentage	50.00%
PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	348		280
Life Insurance And Supplemental Benefits [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	161		162
Solar Loan Investments [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	180		111
Leases [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	840		881
Partnerships And Corporate Joint Ventures [Member] | Power [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	40		32
Other Investments [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	7		7
Equity Method Investments [Member] | Partnerships And Corporate Joint Ventures [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	94	[1]	106	[1]
Cost Method Investments [Member] | Partnerships And Corporate Joint Ventures [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	$ 2	[2]	$ 4	[2]

[1] During the three years ended December 31, 2012, 2011 and 2010, the amount of dividends from these investments was $17 million, $3 million and $5 million, respectively. Energy Holdings’ share of income and cash flow distribution percentages were at 50% as of December 31, 2012.

[2] Energy Holdings' investments in certain companies in which it does not have the ability to exercise significant influence. Such investments are accounted for under the cost method.