Income Taxes (Reconciliation Of Reported Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Income	$ 360	$ 294	$ 323	$ 526	$ 282	$ 567	$ 224	$ 491	$ 1,503	$ 1,564	$ 1,592
Income (Loss) from Discontinued Operations, including Gain (Loss) on Disposal, net of tax benefit	0	29	3	64	(8)	20	2	(7)	96	7	(2)
Income from Continuing Operations									1,407	1,557	1,594
Total Income Tax									977	1,059	1,042
PSEG [Member]
Net Income									1,503	1,564	1,592
Income (Loss) from Discontinued Operations, including Gain (Loss) on Disposal, net of tax benefit									96	7	(2)
Income from Continuing Operations									1,407	1,557	1,594
Preferred Dividends									0	(1)	(4)
Income from Continuing Operations, excluding Preferred Dividends									1,407	1,558	1,598
Federal									258	(166)	560
State									32	157	257
Total Current									290	(9)	817
Federal									501	992	178
State									191	79	44
Total Deferred									692	1,071	222
Investment Tax Credit									(5)	(3)	3
Total Income Tax									977	1,059	1,042
Pre-Tax Income									2,384	2,617	2,640
Tax Computed at Statutory Rate @ 35%									834	916	924
State Income Taxes (net of federal income tax)									146	154	201
Uncertain Tax Positions									19	30	(73)
Manufacturing Deduction									(15)	(24)	(7)
Nuclear Decommissioning Trust									14	10	7
Plant-Related Items									(6)	(3)	3
Tax Credits									(5)	(2)	(3)
Other									(10)	(22)	(10)
Sub-Total									143	143	118
Total Income Tax Provision									977	1,059	1,042
Effective Income Tax Rate									41.00%	40.50%	39.50%
Power [Member]
Net Income	226	302	208	362	191	384	204	364	1,098	1,143	1,189
Income (Loss) from Discontinued Operations, including Gain (Loss) on Disposal, net of tax benefit	0	29	3	64	(8)	20	2	(7)	96	7	(2)
Income from Continuing Operations									1,002	1,136	1,191
Federal									400	12	416
State									40	127	144
Total Current									440	139	560
Federal									151	598	177
State									94	41	30
Total Deferred									245	639	207
Total Income Tax									685	778	767
Pre-Tax Income									1,687	1,914	1,958
Tax Computed at Statutory Rate @ 35%									591	670	685
State Income Taxes (net of federal income tax)									87	109	113
Uncertain Tax Positions									11	10	(26)
Manufacturing Deduction									(15)	(24)	(7)
Nuclear Decommissioning Trust									14	10	7
Other									(3)	3	(5)
Sub-Total									94	108	82
Total Income Tax Provision									685	778	767
Effective Income Tax Rate									40.60%	40.60%	39.20%
PSE&G [Member]
Net Income	99	154	105	163	83	155	3	118	521	359	325
Net Income									521	358	321
Preferred Dividends									0	(1)	(4)
Income from Continuing Operations, excluding Preferred Dividends									521	359	325
Federal									(225)	(211)	7
State									(6)	(1)	22
Total Current									(231)	(212)	29
Federal									483	384	158
State									92	63	38
Total Deferred									575	447	196
Investment Tax Credit									(4)	(3)	1
Total Income Tax									340	232	226
Pre-Tax Income									861	591	551
Tax Computed at Statutory Rate @ 35%									301	207	193
State Income Taxes (net of federal income tax)									56	40	39
Uncertain Tax Positions									(1)	(1)	(3)
Plant-Related Items									(6)	(3)	3
Tax Credits									(4)	(2)	(3)
Other									(6)	(9)	(3)
Sub-Total									39	25	33
Total Income Tax Provision									$ 340	$ 232	$ 226
Effective Income Tax Rate									39.50%	39.20%	41.00%