Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,016	$ 2,142	$ 4,834	$ 4,733
Net Income (Loss)		269	109	827	223
Property, Plant and Equipment, Additions		952	919	2,005	1,981
Total Assets		43,707		43,707		$ 42,716
Investments in Equity Method Subsidiaries		87		87		87
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,386	1,393	3,231	3,219
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		767	918	2,170	2,187
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues		123	116	270	199
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,386	1,393	3,231	3,219
Net Income (Loss)		231	208	550	507
Property, Plant and Equipment, Additions		697	641	1,447	1,389
Total Assets		29,603		29,603		28,554
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		767	918	2,170	2,187
Net Income (Loss)		41	(97)	275	(267)
Property, Plant and Equipment, Additions		248	269	547	576
Total Assets		12,772		12,772		12,418
Investments in Equity Method Subsidiaries		87		87		87
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	123	116	270	199
Net Income (Loss)	[1]	(3)	(2)	2	(17)
Property, Plant and Equipment, Additions	[1]	7	9	11	16
Total Assets	[1]	2,407		2,407		2,666
Investments in Equity Method Subsidiaries	[1]	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(260)	(285)	(837)	(872)
Net Income (Loss)	[2]	0	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(1,075)		(1,075)		(922)
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 relate to intercompany transactions between PSE&G and Power. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 19. Related-Party Transactions.