Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Details) (USD $) In Millions, except Share data in Thousands, 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
Continuing Operations									$ 1,407	$ 1,557	$ 1,594
Discontinued Operations	0	29	3	64	(8)	20	2	(7)	96	7	(2)
Net Income	360	294	323	526	282	567	224	491	1,503	1,564	1,592
Weighted Average Common Shares Outstanding Before Various Effects, Basic									505,949	505,985	505,986
Weighted Average Common Shares Outstanding Before Various Effects, Diluted									505,949	505,985	505,986
Incremental common shares attributable to share based payment arrangements, Basic									0	0	0
Incremental common shares attributable to share based payment arrangements, Diluted									1,033	1,060	1,078
Total Shares, Basic	506,000	506,000	506,000	506,000	506,000	506,000	506,000	506,000	505,949	505,985	505,986
Total Shares, Diluted	507,000	507,000	507,000	507,000	507,000	507,000	507,000	507,000	506,982	507,045	507,064
Income from Continuing Operations, Basic	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 0.57	$ 1.08	$ 0.44	$ 0.99	$ 2.78	$ 3.08	$ 3.15
Earnings Per Share, Discontinued Operations, Basic									$ 0.19	$ 0.01	$ 0.00
Income from Continuing Operations, Diluted	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 0.57	$ 1.08	$ 0.44	$ 0.99	$ 2.77	$ 3.07	$ 3.14
Earnings Per Share, Discontinued Operations, Diluted									$ 0.19	$ 0.01	$ 0.00
Earnings Per Share, Basic, Total	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 0.56	$ 1.12	$ 0.44	$ 0.97	$ 2.97	$ 3.09	$ 3.15
Earnings Per Share, Diluted, Total	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 0.56	$ 1.12	$ 0.44	$ 0.97	$ 2.96	$ 3.08	$ 3.14
PSEG [Member]
Continuing Operations									1,407	1,557	1,594
Discontinued Operations									96	7	(2)
Net Income									$ 1,503	$ 1,564	$ 1,592