Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,641		$ 2,554		$ 8,113		$ 7,650
Net Income (Loss)	444		390		1,042		1,043
Total Assets	34,147				34,147				32,522
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,138		1,174		3,824		3,818
Net Income (Loss)	222		226		440		577
Property, Plant and Equipment, Additions	188		210		414		458
Total Assets	11,750				11,750				12,002
Investments in Equity Method Subsidiaries	122				122				123
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,655		1,666		5,235		5,084
Net Income (Loss)	200		168		565		468
Property, Plant and Equipment, Additions	497		480		1,493		1,628
Total Assets	20,917				20,917				19,720
Investments in Equity Method Subsidiaries	0				0				0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	123	[1]	3	[1]	359	[1]	29	[1]
Net Income (Loss)	22	[1]	(4)	[1]	37	[1]	(2)	[1]
Property, Plant and Equipment, Additions	8	[1]	6	[1]	15	[1]	16	[1]
Total Assets	1,907	[1]			1,907	[1]			4,025	[1]
Investments in Equity Method Subsidiaries	3	[1]			3	[1]			3	[1]
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(275)	[2]	(289)	[2]	(1,305)	[2]	(1,281)	[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	(427)	[2]			(427)	[2]			(3,225)	[2]
Investments in Equity Method Subsidiaries	0	[2]			0	[2]			0	[2]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,641		2,554		8,113		7,650
Net Income (Loss)	444		390		1,042		1,043
Property, Plant and Equipment, Additions	693		696		1,922		2,102
Total Assets	34,147				34,147				32,522
Investments in Equity Method Subsidiaries	$ 125				$ 125				$ 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.