Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues		$ 1,905		$ 2,314		$ 4,521	$ 5,449
Net Income (Loss)		187		345		658	931
Property, Plant and Equipment, Additions		906		996		1,971	1,743
Total Assets		39,045				39,045		$ 37,535
Investments in Equity Method Subsidiaries		112				112		119
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,350		1,466		3,062	3,468
Net Income (Loss)		179		167		441	409
Property, Plant and Equipment, Additions		631		631		1,355	1,230
Total Assets		24,737				24,737		23,677
Investments in Equity Method Subsidiaries		0				0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		714		1,025		2,027	2,750
Net Income (Loss)		(11)		166		181	501
Property, Plant and Equipment, Additions		265		348		598	487
Total Assets		13,278				13,278		12,250
Investments in Equity Method Subsidiaries		112				112		119
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	127		108		249	206
Net Income (Loss)	[1]	19		12		36	21
Property, Plant and Equipment, Additions	[1]	10		17		18	26
Total Assets	[1]	2,873				2,873		2,810
Investments in Equity Method Subsidiaries	[1]	0				0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(286)		(285)		(817)	(975)
Net Income (Loss)		0	[2]	0	[2]	0	0
Property, Plant and Equipment, Additions		0	[2]	$ 0	[2]	0	$ 0
Total Assets	[2]	(1,843)				(1,843)		(1,202)
Investments in Equity Method Subsidiaries		$ 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 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.