Schedule Of Consolidated Debt (Fair Value of Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	$ 7,923
Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	2,353		2,767
PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	4,804		4,277
Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	44		95
Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	7,939		8,094
Long-term Debt, Fair Value	9,324	[1]	9,283	[1]
Long-term Debt [Member] | PSEG [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	38		39
Long-term Debt, Fair Value	57	[1]	62	[1]
Long-term Debt [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	4,795	[2]	4,270	[2]
Long-term Debt, Fair Value	5,606	[1],[2]	4,905	[1],[2]
Resourse Debt [Member] | Power [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	2,340	[2]	2,751	[2]
Long-term Debt, Fair Value	2,818	[1],[2]	3,158	[1],[2]
Transition Funding [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	690	[2]	895	[2]
Long-term Debt, Fair Value	765	[1],[2]	1,016	[1],[2]
Transition Funding II [Member] | PSE&G [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	32	[2]	44	[2]
Long-term Debt, Fair Value	34	[1],[2]	47	[1],[2]
Project Level, Non-Recourse Debt [Member] | Energy Holdings [Member]
Debt Instrument [Line Items]
Long-term Debt, Carrying Amount	44	[3]	95	[3]
Long-term Debt, Fair Value	44	[1],[3]	95	[1],[3]
Dynegy Energy Holdings Inc [Member]
Debt Instrument [Line Items]
Fair value of non-recourse debt			$ 50

[1] Fair value represents net offsets to debt resulting from adjustments from interest rate swaps entered into to hedge certain debt at Power. Carrying amount represents such fair value reduced by the unamortized premium resulting from a debt exchange entered into between Power and Energy Holdings.

[2] The debt fair valuation is based on the present value of each bond’s future cash flows. The discount rates used in the present value analysis are based on an estimate of new issue bond yields across the treasury curve. When a bond has embedded options, an interest rate model is used to reflect the impact of interest rate volatility into the analysis (primarily Level 2 measurements).

[3] Fair value amounts as of December 31, 2011 include $50 million of non-recourse project debt related to Dynegy which is classified as a Level 3 measurement. As of the June 5, 2012, the effective date of the amended settlement agreement, the $50 million of Notes Payable was written off. See the Fair Value Option Section of Note 17. Fair Value Measurements for additional information. Non-recourse project debt of $44 million is valued as equivalent to the amortized cost and is classified as a Level 3 measurement.