Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) (USD $) In Millions, except Share data in Thousands, 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
Continuing Operations									$ 1,275	$ 1,407	$ 1,557
Income (Loss) on Discontinued Operations, net of tax	0	0	0	0	0	29	3	64	0	96	7
Net Income	224	347	211	493	360	294	323	526	1,275	1,503	1,564
Weighted Average Common Shares Outstanding, Basic									505,933	505,949	505,985
Effect of Stock Based Compensation Awards, Basic									0	0	0
Total Shares, Basic	506,000	506,000	506,000	506,000	506,000	506,000	506,000	506,000	505,933	505,949	505,985
Continuing Operations, Basic	$ 0.44	$ 0.69	$ 0.42	$ 0.97	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 2.52	$ 2.78	$ 3.08
Discontinued Operations, Basic									$ 0.00	$ 0.19	$ 0.01
Net Income, Basic	$ 0.44	$ 0.69	$ 0.42	$ 0.97	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 2.52	$ 2.97	$ 3.09
Weighted Average Common Shares Outstanding, Diluted									505,933	505,949	505,985
Effect of Stock Based Compensation Awards, Diluted									1,153	1,033	1,060
Total Shares, Diluted	507,000	507,000	507,000	507,000	507,000	507,000	507,000	507,000	507,086	506,982	507,045
Continuing Operations, Diluted	$ 0.44	$ 0.68	$ 0.42	$ 0.97	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 2.51	$ 2.77	$ 3.07
Discontinued Operations, Diluted									$ 0.00	$ 0.19	$ 0.01
Net Income, Diluted	$ 0.44	$ 0.68	$ 0.42	$ 0.97	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 2.51	$ 2.96	$ 3.08
PSEG [Member]
Continuing Operations									$ 1,275	$ 1,407	$ 1,557