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, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net Income (Loss)	$ 333		$ 211		$ 653		$ 704
Total Assets	32,059				32,059				31,725
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,190		985		2,637		2,546
Income (Loss) From Continuing Operations	204		104		341		357
Net Income (Loss)	204		104		341		357
Segment Earnings (Loss)	204		104		341		357
Gross Additions to Long-Lived Assets	79		107		222		344
Total Assets	10,570				10,570				11,032
Investments in Equity Method Subsidiaries	40				40				40
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,423		1,407		3,418		3,346
Income (Loss) From Continuing Operations	121		101		300		298
Net Income (Loss)	121		101		300		298
Segment Earnings (Loss)	121		101		300		298
Gross Additions to Long-Lived Assets	576		435		1,148		870
Total Assets	19,994				19,994				19,223
Investments in Equity Method Subsidiaries	0				0				0
Energy Holdings [Member]
Segment Reporting Information [Line Items]
Operating Revenues	18		14		34		34
Income (Loss) From Continuing Operations	4		2		4		42
Net Income (Loss)	4		2		4		42
Segment Earnings (Loss)	4		2		4		42
Gross Additions to Long-Lived Assets	21		44		27		55
Total Assets	1,431				1,431				1,454
Investments in Equity Method Subsidiaries	97				97				94
PSEG Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(321)	[1]	(308)	[1]	(993)	[1]	(953)	[1]
Income (Loss) From Continuing Operations	4	[1]	4	[1]	8	[1]	7	[1]
Net Income (Loss)	4	[1]	4	[1]	8	[1]	7	[1]
Segment Earnings (Loss)	4	[1]	4	[1]	8	[1]	7	[1]
Gross Additions to Long-Lived Assets	6	[1]	7	[1]	9	[1]	11	[1]
Total Assets	64	[1]			64	[1]			16	[1]
Investments in Equity Method Subsidiaries	0	[1]			0	[1]			0	[1]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,310		2,098		5,096		4,973
Income (Loss) From Continuing Operations	333		211		653		704
Net Income (Loss)	333		211		653		704
Segment Earnings (Loss)	333		211		653		704
Gross Additions to Long-Lived Assets	682		593		1,406		1,280
Total Assets	32,059				32,059				31,725
Investments in Equity Method Subsidiaries	$ 137				$ 137				$ 134

[1] Other activities include amounts applicable to PSEG (as parent company), Services and intercompany eliminations, primarily relating to intercompany transactions between Power and PSE&G. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are priced in accordance with applicable regulations, including affiliate pricing rules, 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 18. Related-Party Transactions.