Fair Value Measurements (Fair Value Of Debt) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	$ 8,969		$ 8,940
Long-term Debt, Fair Value	10,055	[1]	9,836	[1]
Power - Recourse Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	3,350		3,455
Long-term Debt, Fair Value	3,710	[1]	3,831	[1]
PSE&G [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	4,535		4,283
Long-term Debt, Fair Value	5,099	[1]	4,615	[1]
Transition Funding (PSE&G) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	948		1,090
Long-term Debt, Fair Value	1,080	[1]	1,245	[1]
Transition Funding II [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	50		55
Long-term Debt, Fair Value	54	[1]	59	[1]
Energy Holdings Project Level, Non-Recourse Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	46		47
Long-term Debt, Fair Value	46	[1]	47	[1]
PSEG (Parent) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount	40		10
Long-term Debt, Fair Value	$ 66	[1]	$ 39	[1]

[1] Fair value excludes unamortized discounts, including amounts related to the Debt Exchange between Power and Energy Holdings that is deferred at the PSEG parent level since the exchange was between subsidiaries of the same parent company.