Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,616	$ 3,135
Net Income (Loss)		471	586
Property, Plant and Equipment, Additions		1,065	747
Total Assets		38,126		$ 37,535
Investments in Equity Method Subsidiaries		116		119
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,712	2,002
Net Income (Loss)		262	242
Property, Plant and Equipment, Additions		724	599
Total Assets		24,372		23,677
Investments in Equity Method Subsidiaries		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,313	1,725
Net Income (Loss)		192	335
Property, Plant and Equipment, Additions		333	139
Total Assets		12,617		12,250
Investments in Equity Method Subsidiaries		116		119
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	122	98
Net Income (Loss)	[1]	17	9
Property, Plant and Equipment, Additions	[1]	8	9
Total Assets	[1]	2,462		2,810
Investments in Equity Method Subsidiaries	[1]	0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(531)	(690)
Net Income (Loss)		0	0
Property, Plant and Equipment, Additions		0	$ 0
Total Assets	[2]	(1,325)		(1,202)
Investments in Equity Method Subsidiaries		$ 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 relate 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.