Income Taxes (Reconciliation Of Reported Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income	$ 224	$ 347	$ 211	$ 493	$ 360	$ 294	$ 323	$ 526	$ 1,275	$ 1,503	$ 1,564
Income (Loss) on Discontinued Operations, net of tax	0	0	0	0	0	29	3	64	0	96	7
INCOME FROM CONTINUING OPERATIONS									1,275	1,407	1,557
Total Income Tax									736	977	1,059
PSEG [Member]
INCOME FROM CONTINUING OPERATIONS									1,275	1,407	1,557
Preferred Dividends									0	0	(1)
Income from Continuing Operations, excluding Preferred Dividends									1,275	1,407	1,558
Federal									(204)	258	(166)
State									(2)	32	157
Total Current									(206)	290	(9)
Federal									758	501	992
State									125	191	79
Total Deferred									883	692	1,071
Investment tax credit									59	(5)	(3)
Total Income Tax									736	977	1,059
Pre-Tax Income									2,011	2,384	2,617
Tax Computed at Statutory Rate @ 35%									704	834	916
State Income Taxes (net of federal income tax)									115	146	154
Uncertain Tax Positions									4	19	30
Manufacturing Deduction									0	(15)	(24)
Nuclear Decommissioning Trust									10	14	10
Plant-Related Items									(5)	(6)	(3)
Tax Credits									(10)	(5)	(2)
Audit Settlement									(71)	0	0
Other									(11)	(10)	(22)
Sub-Total									32	143	143
Total Income Tax Provision									736	977	1,059
Effective income tax rate									36.60%	41.00%	40.50%
Power [Member]
Net Income	109	181	104	253	226	302	208	362	647	1,098	1,143
Income (Loss) on Discontinued Operations, net of tax	0	0	0	0	0	29	3	64	0	96	7
INCOME FROM CONTINUING OPERATIONS									647	1,002	1,136
Federal									83	400	12
State									53	40	127
Total Current									136	440	139
Federal									262	151	598
State									35	94	41
Total Deferred									297	245	639
Total Income Tax									433	685	778
Pre-Tax Income									1,080	1,687	1,914
Tax Computed at Statutory Rate @ 35%									378	591	670
State Income Taxes (net of federal income tax)									55	87	109
Uncertain Tax Positions									(6)	11	10
Manufacturing Deduction									0	(15)	(24)
Nuclear Decommissioning Trust									10	14	10
Audit Settlement									(1)	0	0
Other									(3)	(3)	3
Sub-Total									55	94	108
Total Income Tax Provision									433	685	778
Effective income tax rate									40.10%	40.60%	40.60%
PSE&G [Member]
Net Income									528	521	358
Net Income	75	155	101	197	99	154	105	163	528	521	359
Preferred Dividends									0	0	(1)
Income from Continuing Operations, excluding Preferred Dividends									528	521	359
Federal									(217)	(225)	(211)
State									9	(6)	(1)
Total Current									(208)	(231)	(212)
Federal									409	483	384
State									83	92	63
Total Deferred									492	575	447
Investment tax credit									23	(4)	(3)
Total Income Tax									307	340	232
Pre-Tax Income									835	861	591
Tax Computed at Statutory Rate @ 35%									292	301	207
State Income Taxes (net of federal income tax)									52	56	40
Uncertain Tax Positions									7	(1)	(1)
Plant-Related Items									(4)	(6)	(3)
Tax Credits									(3)	(4)	(2)
Audit Settlement									(31)	0	0
Other									(6)	(6)	(9)
Sub-Total									15	39	25
Total Income Tax Provision									$ 307	$ 340	$ 232
Effective income tax rate									36.80%	39.50%	39.20%