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, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,773		$ 2,641	$ 2,249	$ 3,223	$ 2,318		$ 2,554	$ 2,310	$ 2,786	$ 10,886		$ 9,968		$ 9,781
Depreciation and Amortization											1,227		1,178		1,054
Operating Income (Loss)	807		746	365	705	365		712	612	610	2,623		2,299		2,278
Income from Equity Method Investments											13		11		12
Interest Expense											(389)		(402)		(423)
Income Tax Expense (Benefit)											938		812		736
Net Income (Loss)											1,518		1,243		1,275
Total Assets	35,333					32,522					35,333		32,522
Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues											5,434		5,063		4,873
Depreciation and Amortization											292		273		242
Operating Income (Loss)											1,209		1,070		1,123
Income from Equity Method Investments											14		16		15
Interest Income											1		1		3
Interest Expense											(122)		(116)		(132)
Income (Loss) before Income Taxes											1,251		1,063		1,099
Income Tax Expense (Benefit)											491		419		433
Net Income (Loss)											760		644		666
Gross Additions to Long-Lived Assets											626		609		770
Total Assets	12,046					12,002					12,046		12,002		11,323
Investments in Equity Method Subsidiaries	121					123					121		123		125
PSE&G [Member]
Segment Reporting Information [Line Items]
Operating Revenues											6,766		6,655		6,626
Depreciation and Amortization											906		872		778
Operating Income (Loss)											1,393		1,235		1,083
Income from Equity Method Investments											0		0		0
Interest Income											26		25		20
Interest Expense											(277)		(293)		(295)
Income (Loss) before Income Taxes											1,174		993		835
Income Tax Expense (Benefit)											449		381		307
Net Income (Loss)											725		612		528
Gross Additions to Long-Lived Assets											2,164		2,175		1,770
Total Assets	22,223					19,720					22,223		19,720		19,223
Investments in Equity Method Subsidiaries	0					0					0		0		0
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues											455		52		103
Depreciation and Amortization											29		33		34
Operating Income (Loss)											21		(6)		72
Income from Equity Method Investments											(1)		(5)		(3)
Interest Income											25		25		25
Interest Expense											(12)		(15)		(17)
Income (Loss) before Income Taxes											31		(1)		77
Income Tax Expense (Benefit)											(2)		12		(4)
Net Income (Loss)											33		(13)		81
Gross Additions to Long-Lived Assets											30		27		34
Total Assets	2,799					4,025					2,799		4,025		4,161
Investments in Equity Method Subsidiaries	2					3					2		3		9
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues											(1,769)	[1]	(1,802)	[1]	(1,821)	[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]	(22)	[1]	(21)	[1]
Interest Expense											22	[1]	22	[1]	21	[1]
Income (Loss) before Income Taxes											0	[1]	0	[1]	0	[1]
Income Tax Expense (Benefit)											0	[1]	0	[1]	0	[1]
Net Income (Loss)											0	[1]	0	[1]	0	[1]
Gross Additions to Long-Lived Assets											0	[1]	0	[1]	0	[1]
Total Assets	(1,735)	[1]				(3,225)	[1]				(1,735)	[1]	(3,225)	[1]	(2,982)	[1]
Investments in Equity Method Subsidiaries	0	[1]				0	[1]				0	[1]	0	[1]	0	[1]
Consolidated [Member]
Segment Reporting Information [Line Items]
Operating Revenues											10,886		9,968		9,781
Depreciation and Amortization											1,227		1,178		1,054
Operating Income (Loss)											2,623		2,299		2,278
Income from Equity Method Investments											13		11		12
Interest Income											30		29		27
Interest Expense											(389)		(402)		(423)
Income (Loss) before Income Taxes											2,456		2,055		2,011
Income Tax Expense (Benefit)											938		812		736
Net Income (Loss)											1,518		1,243		1,275
Gross Additions to Long-Lived Assets											2,820		2,811		2,574
Total Assets	35,333					32,522					35,333		32,522		31,725
Investments in Equity Method Subsidiaries	123					126					123		126		134
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)											$ 1,518		$ 1,243		$ 1,275

[1] 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 23. Related-Party Transactions.