Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,316	$ 2,016	$ 5,296	$ 4,834
Net Income		153	269	853	827
Property, Plant and Equipment, Additions		809	952	1,604	2,005
Total Assets		46,280		46,280		$ 45,326
Investments in Equity Method Subsidiaries		88		88		86
Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,382	1,386	3,414	3,231
PSEG Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,083	767	2,499	2,170
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues		87	123	228	270
Operating Segments [Member] | Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,382	1,386	3,414	3,231
Net Income		227	231	630	550
Property, Plant and Equipment, Additions		633	697	1,258	1,447
Total Assets		32,185		32,185		31,109
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | PSEG Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,083	767	2,499	2,170
Net Income		(40)	41	256	275
Property, Plant and Equipment, Additions		172	248	339	547
Total Assets		12,704		12,704		12,594
Investments in Equity Method Subsidiaries		88		88		86
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	87	123	228	270
Net Income	[1]	(34)	(3)	(33)	2
Property, Plant and Equipment, Additions	[1]	4	7	7	11
Total Assets	[1]	2,405		2,405		2,604
Investments in Equity Method Subsidiaries	[1]	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(236)	(260)	(845)	(837)
Net Income	[2]	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(1,014)		(1,014)		(981)
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 PSEG Power. For a further discussion of the intercompany transactions between PSE&G and PSEG Power, see Note 20. Related-Party Transactions.