Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,592	$ 2,616
Net Income (Loss)		114	471
Property, Plant and Equipment, Additions		1,062	1,065
Total Assets		39,664		$ 40,070
Investments in Equity Method Subsidiaries		103		102
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,812	1,712
Net Income (Loss)		299	262
Property, Plant and Equipment, Additions		748	724
Total Assets		26,487		26,288
Investments in Equity Method Subsidiaries		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,284	1,313
Net Income (Loss)		(170)	192
Property, Plant and Equipment, Additions		307	333
Total Assets		11,729		12,193
Investments in Equity Method Subsidiaries		103		102
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	83	122
Net Income (Loss)	[1]	(15)	17
Property, Plant and Equipment, Additions	[1]	7	8
Total Assets	[1]	2,249		2,373
Investments in Equity Method Subsidiaries	[1]	0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(587)	(531)
Net Income (Loss)	[2]	0
Property, Plant and Equipment, Additions	[2]	0	$ 0
Total Assets	[2]	(801)		(784)
Investments in Equity Method Subsidiaries	[2]	$ 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.