Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,980	$ 2,818
Net Income		700	558
Property, Plant and Equipment, Additions		795	1,053
Total Assets		45,756		$ 45,326
Investments in Equity Method Subsidiaries		86		86
PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		2,032	1,845
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,416	1,403
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues		141	147
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		2,032	1,845
Net Income		403	319
Property, Plant and Equipment, Additions		625	750
Total Assets		31,500		31,109
Investments in Equity Method Subsidiaries		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,416	1,403
Net Income		296	234
Property, Plant and Equipment, Additions		167	299
Total Assets		12,671		12,594
Investments in Equity Method Subsidiaries		86		86
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	141	147
Net Income	[1]	1	5
Property, Plant and Equipment, Additions	[1]	3	4
Total Assets	[1]	2,333		2,604
Investments in Equity Method Subsidiaries	[1]	0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(609)	(577)
Net Income	[2]	0
Property, Plant and Equipment, Additions	[2]	0	$ 0
Total Assets	[2]	(748)		(981)
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 20. Related-Party Transactions.