Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenues	$ 3,135		$ 3,223
Net Income (Loss)	586		386
Total Assets	35,827				35,333
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,725		1,700
Net Income (Loss)	335		164
Property, Plant and Equipment, Additions	139		126
Total Assets	12,220				12,046
Investments in Equity Method Subsidiaries	119				121
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,002		2,145
Net Income (Loss)	242		214
Property, Plant and Equipment, Additions	599		481
Total Assets	22,345				22,223
Investments in Equity Method Subsidiaries	0				0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	98	[1]	105	[1]
Net Income (Loss)	9	[1]	8	[1]
Property, Plant and Equipment, Additions	9	[1]	2	[1]
Total Assets	3,168	[1]			2,799	[1]
Investments in Equity Method Subsidiaries	2	[1]			2	[1]
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(690)	[2]	(727)	[2]
Net Income (Loss)	0	[2]
Property, Plant and Equipment, Additions	0	[2]	0	[2]
Total Assets	(1,906)	[2]			(1,735)	[2]
Investments in Equity Method Subsidiaries	0	[2]			0	[2]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	3,135		3,223
Net Income (Loss)	586		386
Property, Plant and Equipment, Additions	747		609
Total Assets	35,827				35,333
Investments in Equity Method Subsidiaries	$ 121				$ 123

[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.