Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,818	$ 2,591
Net Income (Loss)		558	114
Property, Plant and Equipment, Additions		1,053	1,062
Total Assets		42,790		$ 42,716
Investments in Equity Method Subsidiaries		86		87
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,845	1,826
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,403	1,269
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues		147	83
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,845	1,826
Net Income (Loss)		319	299
Property, Plant and Equipment, Additions		750	748
Total Assets		28,774		28,554
Investments in Equity Method Subsidiaries		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,403	1,269
Net Income (Loss)		234	(170)
Property, Plant and Equipment, Additions		299	307
Total Assets		12,263		12,418
Investments in Equity Method Subsidiaries		86		87
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	147	83
Net Income (Loss)	[1]	5	(15)
Property, Plant and Equipment, Additions	[1]	4	7
Total Assets	[1]	2,481		2,666
Investments in Equity Method Subsidiaries	[1]	0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(577)	(587)
Net Income (Loss)	[2]	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0
Total Assets	[2]	(728)		(922)
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. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 19. Related-Party Transactions.