Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,394	$ 2,254	$ 7,228	$ 6,987
Net Income (Loss)		412	395	1,239	618
Property, Plant and Equipment, Additions		1,023	1,065	3,028	3,046
Total Assets		45,073		45,073		$ 42,716
Investments in Equity Method Subsidiaries		88		88		87
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,595	1,530	4,826	4,749
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		868	846	3,038	3,033
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues		151	135	421	334
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,595	1,530	4,826	4,749
Net Income (Loss)		278	246	828	753
Property, Plant and Equipment, Additions		766	729	2,213	2,118
Total Assets		30,694		30,694		28,554
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		868	846	3,038	3,033
Net Income (Loss)		125	136	400	(131)
Property, Plant and Equipment, Additions		253	327	800	903
Total Assets		12,681		12,681		12,418
Investments in Equity Method Subsidiaries		88		88		87
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	151	135	421	334
Net Income (Loss)	[1]	9	13	11	(4)
Property, Plant and Equipment, Additions	[1]	4	9	15	25
Total Assets	[1]	2,249		2,249		2,666
Investments in Equity Method Subsidiaries	[1]	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(220)	(257)	(1,057)	(1,129)
Net Income (Loss)	[2]	0	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(551)		(551)		(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.