Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,090	$ 2,450	$ 1,905	$ 2,616	$ 2,278	$ 2,688	$ 2,314	$ 3,135	$ 9,061	$ 10,415	$ 10,886
Depreciation and Amortization										1,476	1,214	1,227
Operating Income (Loss)		(175)	$ 577	$ 347	$ 827	532	$ 814	$ 568	$ 1,048	1,576	2,962	2,623
Income from Equity Method Investments										11	12	13
Interest Income										30	31	30
Interest Expense										(385)	(393)	(389)
Income (Loss) before Income Taxes										1,298	2,680	2,456
Income Tax Expense (Benefit)										411	1,001	938
Net Income (Loss)										887	1,679	1,518
Gross Additions to Long-Lived Assets										4,199	3,863	2,820
Total Assets		40,070				37,535				40,070	37,535	35,287
Investments in Equity Method Subsidiaries		102				119				102	119	123
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)										887	1,679	1,518
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues										4,023	4,928	5,434
Depreciation and Amortization										881	291	292
Operating Income (Loss)										13	1,430	1,209
Income from Equity Method Investments										11	14	14
Interest Income										4	2	1
Interest Expense										(84)	(121)	(122)
Income (Loss) before Income Taxes										(43)	1,367	1,251
Income Tax Expense (Benefit)										(61)	511	491
Net Income (Loss)										18	856	760
Gross Additions to Long-Lived Assets										1,343	1,117	626
Total Assets		12,193				12,250				12,193	12,250	12,037
Investments in Equity Method Subsidiaries		102				119				102	119	121
Operating Segments [Member] | PSE&G [Member]
Segment Reporting Information [Line Items]
Operating Revenues										6,221	6,636	6,766
Depreciation and Amortization										565	892	906
Operating Income (Loss)										1,614	1,462	1,393
Income from Equity Method Investments										0	0	0
Interest Income										24	25	26
Interest Expense										(289)	(280)	(277)
Income (Loss) before Income Taxes										1,404	1,257	1,174
Income Tax Expense (Benefit)										515	470	449
Net Income (Loss)										889	787	725
Gross Additions to Long-Lived Assets										2,816	2,692	2,164
Total Assets		26,288				23,677				26,288	23,677	22,186
Investments in Equity Method Subsidiaries		0				0				0	0	0
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]									370	462	455
Depreciation and Amortization	[1]									30	31	29
Operating Income (Loss)	[1]									(51)	70	21
Income from Equity Method Investments	[1]									0	(2)	(1)
Interest Income	[1]									4	33	25
Interest Expense	[1]									(14)	(21)	(12)
Income (Loss) before Income Taxes	[1]									(63)	56	31
Income Tax Expense (Benefit)	[1]									(43)	20	(2)
Net Income (Loss)	[1]									(20)	36	33
Gross Additions to Long-Lived Assets	[1]									40	54	30
Total Assets	[1]	2,373				2,810				2,373	2,810	2,799
Investments in Equity Method Subsidiaries	[1]	0				0				0	0	2
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]									(1,553)	(1,611)	(1,769)
Depreciation and Amortization	[2]									0	0	0
Operating Income (Loss)	[2]									0	0	0
Income from Equity Method Investments	[2]									0	0	0
Interest Income	[2]									(2)	(29)	(22)
Interest Expense	[2]									2	29	22
Income (Loss) before Income Taxes	[2]									0	0	0
Income Tax Expense (Benefit)	[2]									0	0	0
Net Income (Loss)	[2]									0		0
Gross Additions to Long-Lived Assets	[2]									0	0	0
Total Assets	[2]	(784)				(1,202)				(784)	(1,202)	(1,735)
Investments in Equity Method Subsidiaries	[2]	$ 0				$ 0				$ 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. 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 24. Related-Party Transactions.