Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,318		$ 2,554	$ 2,310	$ 2,786	$ 2,406		$ 2,402	$ 2,098	$ 2,875	$ 9,968		$ 9,781		$ 11,079
Depreciation and Amortization											1,178		1,054		976
Operating Income (Loss)	365		712	612	610	468		594	433	783	2,299		2,278		2,742
Income from Equity Method Investments											11		12		4
Interest Expense											(402)		(423)		(475)
Income Tax Expense (Benefit)											812		736		977
Income (Loss) on Discontinued Operations, net of tax											0		0		96
Net Income (Loss)											1,243		1,275		1,503
Total Assets	32,522					31,725					32,522		31,725
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues											5,063		4,873		6,150
Depreciation and Amortization											273		242		228
Operating Income (Loss)											1,070		1,123		1,773
Income from Equity Method Investments											16		15		14
Interest Income											1		3		4
Interest Expense											(116)		(132)		(175)
Income (Loss) before Income Taxes											1,063		1,099		1,703
Income Tax Expense (Benefit)											419		433		690
Income (Loss) From Continuing Operations											644		666		1,013
Income (Loss) on Discontinued Operations, net of tax															96
Net Income (Loss)											644		666		1,109
Gross Additions to Long-Lived Assets											609		770		757
Total Assets	12,002					11,323					12,002		11,323
Investments in Equity Method Subsidiaries	123					125					123		125
PSE&G [Member]
Segment Reporting Information [Line Items]
Operating Revenues											6,655		6,626		7,326
Depreciation and Amortization											872		778		719
Operating Income (Loss)											1,235		1,083		1,151
Income from Equity Method Investments											0		0		0
Interest Income											25		20		12
Interest Expense											(293)		(295)		(310)
Income (Loss) before Income Taxes											993		835		861
Income Tax Expense (Benefit)											381		307		340
Income (Loss) From Continuing Operations											612		528		521
Income (Loss) on Discontinued Operations, net of tax															0
Net Income (Loss)											612		528		521
Gross Additions to Long-Lived Assets											2,175		1,770		1,302
Total Assets	19,720					19,223					19,720		19,223
Investments in Equity Method Subsidiaries	0					0					0		0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues											52		103		(149)
Depreciation and Amortization											33		34		29
Operating Income (Loss)											(6)		72		(182)
Income from Equity Method Investments											(5)		(3)		(10)
Interest Income											25		25		20
Interest Expense											(15)		(17)		(7)
Income (Loss) before Income Taxes											(1)		77		(180)
Income Tax Expense (Benefit)											12		(4)		(53)
Income (Loss) From Continuing Operations											(13)		81		(127)
Income (Loss) on Discontinued Operations, net of tax															0
Net Income (Loss)											(13)		81		(127)
Gross Additions to Long-Lived Assets											27		34		24
Total Assets	4,025					4,161					4,025		4,161
Investments in Equity Method Subsidiaries	3					9					3		9
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues											(1,802)	[1]	(1,821)	[1]	(2,248)	[1]
Depreciation and Amortization											0	[1]	0	[1]	0	[1]
Operating Income (Loss)											0	[1]	0	[1]	0	[1]
Income from Equity Method Investments											0	[1]	0	[1]	0	[1]
Interest Income											(22)	[1]	(21)	[1]	(17)	[1]
Interest Expense											22	[1]	21	[1]	17	[1]
Income (Loss) before Income Taxes											0	[1]	0	[1]	0	[1]
Income Tax Expense (Benefit)											0	[1]	0	[1]	0	[1]
Income (Loss) From Continuing Operations											0	[1]	0	[1]	0	[1]
Income (Loss) on Discontinued Operations, net of tax															0
Net Income (Loss)											0	[1]	0	[1]	0	[1]
Gross Additions to Long-Lived Assets											0	[1]	0	[1]	0	[1]
Total Assets	(3,225)	[1]				(2,982)	[1]				(3,225)	[1]	(2,982)	[1]
Investments in Equity Method Subsidiaries	0	[1]				0	[1]				0	[1]	0	[1]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues											9,968		9,781		11,079
Depreciation and Amortization											1,178		1,054		976
Operating Income (Loss)											2,299		2,278		2,742
Income from Equity Method Investments											11		12		4
Interest Income											29		27		19
Interest Expense											(402)		(423)		(475)
Income (Loss) before Income Taxes											2,055		2,011		2,384
Income Tax Expense (Benefit)											812		736		977
Income (Loss) From Continuing Operations											1,243		1,275		1,407
Income (Loss) on Discontinued Operations, net of tax															96
Net Income (Loss)											1,243		1,275		1,503
Gross Additions to Long-Lived Assets											2,811		2,574		2,083
Total Assets	32,522					31,725					32,522		31,725
Investments in Equity Method Subsidiaries	126					134					126		134
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)											$ 1,243		$ 1,275		$ 1,503

[1] Intercompany eliminations, primarily relate to intercompany transactions between Power and PSE&G. 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 Power and PSE&G, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between Power and PSE&G, see Note 24. Related-Party Transactions.