Fair Value Measurements (Fair Value Of Debt) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Carrying Amount	$ 8,250		$ 8,940
Long-term Debt, Fair Value	9,079	[1]	9,836	[1]
Power - Recourse Debt [Member]
Carrying Amount	2,851		3,455
Long-term Debt, Fair Value	3,189	[1]	3,831	[1]
PSE&G [Member]
Carrying Amount	4,284		4,283
Long-term Debt, Fair Value	4,617	[1]	4,615	[1]
Transition Funding (PSE&G) [Member]
Carrying Amount	999		1,090
Long-term Debt, Fair Value	1,127	[1]	1,245	[1]
Transition Funding II [Member]
Carrying Amount	50		55
Long-term Debt, Fair Value	53	[1]	59	[1]
Energy Holdings Project Level, Non-Recourse Debt [Member]
Carrying Amount	46		47
Long-term Debt, Fair Value	46	[1]	47	[1]
PSEG (Parent) [Member]
Carrying Amount	20		10
Long-term Debt, Fair Value	$ 47	[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.