Consolidated Statements Of Operations (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Revenues	$ 9,781	$ 11,079	$ 11,793
Operating Expenses [Abstract]
Energy Costs	3,719	4,747	5,261
Operation and Maintenance	2,632	2,481	2,504
Depreciation and Amortization	1,054	976	955
Taxes Other Than Income Taxes	98	133	136
Total Operating Expenses	7,503	8,337	8,856
OPERATING INCOME	2,278	2,742	2,937
Income from Equity Method Investments	12	4	4
Other Income	260	220	221
Other Deductions	(98)	(85)	(63)
Other-Than-Temporary Impairments	(18)	(22)	(11)
Interest Expense	(423)	(475)	(472)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	2,011	2,384	2,616
Income Tax (Expense) Benefit	(736)	(977)	(1,059)
INCOME FROM CONTINUING OPERATIONS	1,275	1,407	1,557
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax (expense) benefit for the years ended 2012, 2011 and 2010, respectively	0	96	7
Net Income	1,275	1,503	1,564
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (THOUSANDS):
BASIC	505,933	505,949	505,985
DILUTED	507,086	506,982	507,045
EARNINGS PER SHARE:
INCOME FROM CONTINUING OPERATIONS, BASIC	$ 2.52	$ 2.78	$ 3.08
NET INCOME	$ 2.52	$ 2.97	$ 3.09
INCOME FROM CONTINUING OPERATIONS, DILUTED	$ 2.51	$ 2.77	$ 3.07
NET INCOME	$ 2.51	$ 2.96	$ 3.08
DIVIDENDS PAID PER SHARE OF COMMON STOCK	$ 1.42	$ 1.37	$ 1.37
Power [Member]
Operating Revenues	4,865	6,143	6,558
Operating Expenses [Abstract]
Energy Costs	2,383	3,046	3,374
Operation and Maintenance	1,122	1,102	1,046
Depreciation and Amortization	237	224	175
Total Operating Expenses	3,742	4,372	4,595
OPERATING INCOME	1,123	1,771	1,963
Other Income	199	190	170
Other Deductions	(90)	(79)	(53)
Other-Than-Temporary Impairments	(18)	(20)	(9)
Interest Expense	(134)	(175)	(157)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,080	1,687	1,914
Income Tax (Expense) Benefit	(433)	(685)	(778)
INCOME FROM CONTINUING OPERATIONS	647	1,002	1,136
Income (Loss) from Discontinued Operations, including Gain on Disposal, net of tax (expense) benefit for the years ended 2012, 2011 and 2010, respectively	0	96	7
Net Income	647	1,098	1,143
PSE&G [Member]
Operating Revenues	6,626	7,326	7,869
Operating Expenses [Abstract]
Energy Costs	3,159	3,951	4,655
Operation and Maintenance	1,508	1,372	1,442
Depreciation and Amortization	778	719	750
Taxes Other Than Income Taxes	98	133	136
Total Operating Expenses	5,543	6,175	6,983
OPERATING INCOME	1,083	1,151	886
Other Income	52	25	26
Other Deductions	(5)	(4)	(3)
Other-Than-Temporary Impairments	0	(1)	0
Interest Expense	(295)	(310)	(318)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	835	861	591
Income Tax (Expense) Benefit	(307)	(340)	(232)
Preferred Stock Dividends	0	0	(1)
Net Income	528	521	359
EARNINGS AVAILABLE TO PUBLIC SERVICE ENTERPRICE GROUP INCORPORATED	$ 528	$ 521	$ 358