Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,249		$ 2,310		$ 5,472		$ 5,096
Net Income (Loss)	212		333		598		653
Total Assets	33,700				33,700				32,522
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues	986		1,193		2,686		2,644
Net Income (Loss)	54		210		218		351
Property, Plant and Equipment, Additions	100		97		226		248
Total Assets	11,731				11,731				12,002
Investments in Equity Method Subsidiaries	121				121				123
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,435		1,423		3,580		3,418
Net Income (Loss)	151		121		365		300
Property, Plant and Equipment, Additions	515		576		996		1,148
Total Assets	20,613				20,613				19,720
Investments in Equity Method Subsidiaries	0				0				0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	131	[1]	14	[1]	236	[1]	26	[1]
Net Income (Loss)	7	[1]	2	[1]	15	[1]	2	[1]
Property, Plant and Equipment, Additions	5	[1]	9	[1]	7	[1]	10	[1]
Total Assets	1,890	[1]			1,890	[1]			4,025	[1]
Investments in Equity Method Subsidiaries	3	[1]			3	[1]			3	[1]
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(303)	[2]	(320)	[2]	(1,030)	[2]	(992)	[2]
Net Income (Loss)	0	[2]	0	[2]	0	[2]	0	[2]
Property, Plant and Equipment, Additions	0	[2]	0	[2]	0	[2]	0	[2]
Total Assets	(534)	[2]			(534)	[2]			(3,225)	[2]
Investments in Equity Method Subsidiaries	0	[2]			0	[2]			0	[2]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,249		2,310		5,472		5,096
Net Income (Loss)	212		333		598		653
Property, Plant and Equipment, Additions	620		682		1,229		1,406
Total Assets	33,700				33,700				32,522
Investments in Equity Method Subsidiaries	$ 124				$ 124				$ 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.