Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,688	$ 2,641	$ 8,137	$ 8,113
Net Income (Loss)		439	444	1,370	1,042
Property, Plant and Equipment, Additions		1,039	693	2,782	1,922
Total Assets		36,424		36,424		$ 35,333
Investments in Equity Method Subsidiaries		117		117		123
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,766	1,655	5,234	5,235
Net Income (Loss)		222	200	631	565
Property, Plant and Equipment, Additions		716	497	1,946	1,493
Total Assets		22,909		22,909		22,223
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,096	1,138	3,846	3,824
Net Income (Loss)		206	222	707	440
Property, Plant and Equipment, Additions		310	188	797	414
Total Assets		12,314		12,314		12,046
Investments in Equity Method Subsidiaries		116		116		121
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	120	123	326	359
Net Income (Loss)	[1]	11	22	32	37
Property, Plant and Equipment, Additions	[1]	13	8	39	15
Total Assets	[1]	2,775		2,775		2,799
Investments in Equity Method Subsidiaries	[1]	1		1		2
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(294)	(275)	(1,269)	(1,305)
Net Income (Loss)	[2]	0	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(1,574)		(1,574)		(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.