Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,450		$ 2,688		$ 6,971	$ 8,137
Net Income (Loss)		327		439		985	1,370
Property, Plant and Equipment, Additions		1,014		1,039		2,985	2,782
Total Assets		39,488				39,488		$ 37,535
Investments in Equity Method Subsidiaries		106				106		119
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,684		1,766		4,746	5,234
Net Income (Loss)		255		222		696	631
Property, Plant and Equipment, Additions		680		716		2,035	1,946
Total Assets		25,486				25,486		23,677
Investments in Equity Method Subsidiaries		0				0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,075		1,096		3,102	3,846
Net Income (Loss)		139		206		320	707
Property, Plant and Equipment, Additions		325		310		923	797
Total Assets		12,810				12,810		12,250
Investments in Equity Method Subsidiaries		106				106		119
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	7		120		256	326
Net Income (Loss)	[1]	(67)		11		(31)	32
Property, Plant and Equipment, Additions	[1]	9		13		27	39
Total Assets	[1]	2,385				2,385		2,810
Investments in Equity Method Subsidiaries	[1]	0				0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(316)		(294)		(1,133)	(1,269)
Net Income (Loss)		0	[2]	0	[2]	0	0
Property, Plant and Equipment, Additions		0	[2]	$ 0	[2]	0	$ 0
Total Assets	[2]	(1,193)				(1,193)		(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 18. Related-Party Transactions.