Long-Term Investments (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Long-Term Investments [Line Items]
Total Long-Term Investments	$ 1,303		$ 1,623
Dividends in equity method investments	3		5		10
Share of income and cash flow distribution percentage, minimum	40.00%
Share of income and cash flow distribution percentage, maximum	50.00%
PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	280		230
Life Insurance And Supplemental Benefits [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	162		161
Solar Loan Investments [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	111		62
Leases [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	881		1,255
Partnerships And Corporate Joint Ventures [Member] | Power [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	32		25
Other Investments [Member] | PSE&G [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	7		7
Other Investments [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	0		1
Equity Method Investments [Member] | Partnerships And Corporate Joint Ventures [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	106	[1]	105	[1]
Cost Method Investments [Member] | Partnerships And Corporate Joint Ventures [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments	$ 4	[2]	$ 7	[2]

[1] During the three years ended December 31, 2011, 2010 and 2009, the amount of dividends from these investments was $3 million, $5 million and $10 million, respectively. Energy Holdings' share of income and cash flow distribution percentages ranged from 40% to 50% as of December 31, 2011.

[2] Energy Holdings has 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.