Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,263	$ 2,450	$ 6,988	$ 6,971
Net Income (Loss)		395	327	618	985
Property, Plant and Equipment, Additions		1,065	1,014	3,046	2,985
Total Assets		41,157		41,157		$ 40,070
Investments in Equity Method Subsidiaries		90		90		102
Operating Segments [Member] | PSE And G [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,509	1,684	4,689	4,746
Net Income (Loss)		246	255	753	696
Property, Plant and Equipment, Additions		729	680	2,118	2,035
Total Assets		27,802		27,802		26,288
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		873	1,075	3,086	3,102
Net Income (Loss)		136	139	(131)	320
Property, Plant and Equipment, Additions		327	325	903	923
Total Assets		11,631		11,631		12,193
Investments in Equity Method Subsidiaries		90		90		102
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	135	7	334	256
Net Income (Loss)	[1]	13	(67)	(4)	(31)
Property, Plant and Equipment, Additions	[1]	9	9	25	27
Total Assets	[1]	2,288		2,288		2,373
Investments in Equity Method Subsidiaries	[1]	0		0		0
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(254)	(316)	(1,121)	(1,133)
Net Income (Loss)	[2]	0	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0	0	$ 0
Total Assets	[2]	(564)		(564)		(784)
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 relate primarily to intercompany transactions between PSE&G and Power. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are at cost or, in the case of the BGS and BGSS contracts between PSE&G and Power, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 18. Related-Party Transactions.