Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,133	$ 1,905	$ 4,725	$ 4,521
Net Income (Loss)		109	187	223	658
Property, Plant and Equipment, Additions		919	906	1,981	1,971
Total Assets		40,524		40,524		$ 40,070
Investments in Equity Method Subsidiaries		91		91		102
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,368	1,350	3,180	3,062
Net Income (Loss)		208	179	507	441
Property, Plant and Equipment, Additions		641	631	1,389	1,355
Total Assets		27,273		27,273		26,288
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		929	714	2,213	2,027
Net Income (Loss)		(97)	(11)	(267)	181
Property, Plant and Equipment, Additions		269	265	576	598
Total Assets		11,619		11,619		12,193
Investments in Equity Method Subsidiaries		91		91		102
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	116	127	199	249
Net Income (Loss)	[1]	(2)	19	(17)	36
Property, Plant and Equipment, Additions	[1]	9	10	16	18
Total Assets	[1]	2,425		2,425		2,373
Investments in Equity Method Subsidiaries	[1]	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(280)	(286)	(867)	(817)
Net Income (Loss)	[2]	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(793)		(793)		(784)
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 relate primarily 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.