Selected Quarterly Data (Schedule Of Selected Quarterly Data) (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
Operating Revenues	$ 2,636	$ 2,620	$ 2,469	$ 3,354	$ 2,745	$ 3,114	$ 2,361	$ 3,573	$ 11,079	$ 11,793	$ 12,035
Operating Income (Loss)	709	556	621	856	589	971	431	946	2,742	2,937	3,116
Income (Loss) from Continuing Operations	360	265	320	462	290	547	222	498	2,384	2,616	2,636
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)
Net Income (Loss)	360	294	323	526	282	567	224	491	1,503	1,564	1,592
Income (Loss) from Continuing Operations	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 0.57	$ 1.08	$ 0.44	$ 0.99	$ 2.78	$ 3.08	$ 3.15
Net Income (Loss)	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 0.56	$ 1.12	$ 0.44	$ 0.97	$ 2.97	$ 3.09	$ 3.15
Income from Continuing Operations	$ 0.71	$ 0.52	$ 0.63	$ 0.91	$ 0.57	$ 1.08	$ 0.44	$ 0.99	$ 2.77	$ 3.07	$ 3.14
Net Income (Loss)	$ 0.71	$ 0.58	$ 0.63	$ 1.04	$ 0.56	$ 1.12	$ 0.44	$ 0.97	$ 2.96	$ 3.08	$ 3.14
Basic	506,000	506,000	506,000	506,000	506,000	506,000	506,000	506,000	505,949	505,985	505,986
Diluted	507,000	507,000	507,000	507,000	507,000	507,000	507,000	507,000	506,982	507,045	507,064
PSEG [Member]
Income (Loss) from Discontinued Operations, including Gain (Loss) on Disposal, net of tax benefit									96	7	(2)
Net Income (Loss)									1,503	1,564	1,592
Power [Member]
Operating Revenues	1,493	1,398	1,285	1,967	1,575	1,523	1,264	2,196	6,143	6,558	6,772
Operating Income (Loss)	432	483	355	501	357	607	348	651	1,771	1,963	2,081
Income (Loss) from Continuing Operations	226	273	205	298	199	364	202	371	1,687	1,914	1,958
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)
Net Income (Loss)	226	302	208	362	191	384	204	364	1,098	1,143	1,189
PSE&G [Member]
Operating Revenues	1,608	1,841	1,571	2,306	1,882	2,007	1,536	2,444	7,326	7,869	8,243
Operating Income (Loss)	221	328	252	350	219	325	71	271	1,151	886	858
Income (Loss) from Continuing Operations	99	154	105	163	83	155	3	118	861	591	551
Net Income (Loss)	99	154	105	163	83	155	3	118	521	359	325
Earnings Available to PSEG	$ 99	$ 154	$ 105	$ 163	$ 83	$ 155	$ 3	$ 117