Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,314	$ 2,249	$ 5,449	$ 5,472
Net Income (Loss)		345	212	931	598
Property, Plant and Equipment, Additions		996	620	1,743	1,229
Total Assets		36,212		36,212		$ 35,333
Investments in Equity Method Subsidiaries		118		118		123
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,466	1,435	3,468	3,580
Net Income (Loss)		167	151	409	365
Property, Plant and Equipment, Additions		631	515	1,230	996
Total Assets		22,721		22,721		22,223
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,025	986	2,750	2,686
Net Income (Loss)		166	54	501	218
Property, Plant and Equipment, Additions		348	100	487	226
Total Assets		12,166		12,166		12,046
Investments in Equity Method Subsidiaries		116		116		121
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	108	131	206	236
Net Income (Loss)	[1]	12	7	21	15
Property, Plant and Equipment, Additions	[1]	17	5	26	7
Total Assets	[1]	3,017		3,017		2,799
Investments in Equity Method Subsidiaries	[1]	2		2		2
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(285)	(303)	(975)	(1,030)
Net Income (Loss)	[2]	0	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(1,692)		(1,692)		(1,735)
Investments in Equity Method Subsidiaries	[2]	$ 0		$ 0		$ 0

[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 PSE&G and Power. 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 PSE&G and Power, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 17. Related-Party Transactions.