Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Revenues	$ 3,223		$ 2,786
Net Income (Loss)	386		320
Total Assets	33,326				32,522
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,700		1,451
Net Income (Loss)	164		141
Property, Plant and Equipment, Additions	126		151
Total Assets	11,788				12,002
Investments in Equity Method Subsidiaries	123				123
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,145		1,995
Net Income (Loss)	214		179
Property, Plant and Equipment, Additions	481		572
Total Assets	20,175				19,720
Investments in Equity Method Subsidiaries	0				0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	105	[1]	12	[1]
Net Income (Loss)	8	[1]	0	[1]
Property, Plant and Equipment, Additions	2	[1]	1	[1]
Total Assets	4,511	[1]			4,025	[1]
Investments in Equity Method Subsidiaries	3	[1]			3	[1]
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(727)	[2]	(672)	[2]
Net Income (Loss)	0	[2]	0	[2]
Property, Plant and Equipment, Additions	0	[2]	0	[2]
Total Assets	(3,148)	[2]			(3,225)	[2]
Investments in Equity Method Subsidiaries	0	[2]			0	[2]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	3,223		2,786
Net Income (Loss)	386		320
Property, Plant and Equipment, Additions	609		724
Total Assets	33,326				32,522
Investments in Equity Method Subsidiaries	$ 126				$ 126

[1] Includes amounts applicable to Energy Holdings and PSEG LI, which are below the quantitative threshold for separate disclosure as reportable segments. Other also includes amounts applicable to PSEG (parent corporation) and Services.

[2] Intercompany eliminations, primarily related to intercompany transactions between Power and PSE&G. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are at cost or, in the case of the BGS and BGSS contracts between Power and PSE&G, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between Power and PSE&G, see Note 17. Related-Party Transactions.