Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (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	Dec. 31, 2008
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 Expenses									8,337	8,856	8,919
Operating Income (Loss)	709	556	621	856	589	971	431	946	2,742	2,937	3,116
Equity Earnings (Losses) of Subsidiaries									4	4	17
Other Income									220	221	246
Other Deductions									(85)	(63)	(161)
Other-Than-Temporary Investments									(22)	(11)	(61)
Interest Expense									475	472	521
Income Tax Benefit (Expense)									977	1,059	1,042
Income (Loss) on Discontinued Operations, net of Tax	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
Current Assets	3,911				5,051				3,911	5,051
Property, Plant and Equipment, net	17,849				16,390				17,849	16,390
Noncurrent Assets	8,061				8,468				8,061	8,468
Total Assets	29,821				29,909				29,821	29,909
Current Liabilities	2,957				3,485				2,957	3,485
Noncurrent Liabilities	9,131				8,964				9,131	8,964
Long-Term Debt	7,461				7,819				7,461	7,819
Member's Equity	10,272				9,641				10,272	9,641	8,798	7,782
Total Liabilities and Member's Equity	29,821				29,909				29,821	29,909
Net Cash Provided By (Used In) Operating Activities									3,557	2,164	1,855
Net Cash Provided By (Used In) Investing Activities									(1,269)	(1,669)	(792)
Net Cash Provided By (Used In) Financing Activities									(1,734)	(565)	(1,034)
PSEG [Member]
Income Tax Benefit (Expense)									977	1,059	1,042
Income (Loss) on Discontinued Operations, net of Tax									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 Expenses									4,372	4,595	4,691
Operating Income (Loss)	432	483	355	501	357	607	348	651	1,771	1,963	2,081
Other Income									190	170	233
Other Deductions									(79)	(53)	(135)
Other-Than-Temporary Investments									(20)	(9)	(60)
Interest Expense									175	157	161
Income Tax Benefit (Expense)									685	778	767
Income (Loss) on Discontinued Operations, net of Tax	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
Current Assets	2,687				3,444				2,687	3,444
Property, Plant and Equipment, net	6,731				6,342				6,731	6,342
Noncurrent Assets	1,669				1,666				1,669	1,666
Total Assets	11,087				11,452				11,087	11,452
Current Liabilities	902				1,651				902	1,651
Noncurrent Liabilities	2,056				1,969				2,056	1,969
Long-Term Debt	2,685				2,805				2,685	2,805
Member's Equity	5,444				5,027				5,444	5,027	4,467	4,322
Total Liabilities and Member's Equity	11,087				11,452				11,087	11,452
Net Cash Provided By (Used In) Operating Activities									1,812	1,566	1,658
Net Cash Provided By (Used In) Investing Activities									(578)	(1,205)	(652)
Net Cash Provided By (Used In) Financing Activities									(1,233)	(414)	(982)
Power Senior Notes [Member]
Operating Revenues									6,143	6,558	6,772
Operating Expenses									4,372	4,595	4,691
Operating Income (Loss)									1,771	1,963	2,081
Equity Earnings (Losses) of Subsidiaries									0	0	0
Other Income									190	170	233
Other Deductions									(79)	(53)	(135)
Other-Than-Temporary Investments									(20)	(9)	(60)
Interest Expense									(175)	(157)	(161)
Income Tax Benefit (Expense)									(685)	(778)	(767)
Income (Loss) on Discontinued Operations, net of Tax									96	7	(2)
Net Income (Loss)									1,098	1,143	1,189
Current Assets	2,687				3,444				2,687	3,444
Property, Plant and Equipment, net	6,731				6,342				6,731	6,342
Investment in Subsidiaries	0				0				0	0
Noncurrent Assets	1,669				1,666				1,669	1,666
Total Assets	11,087				11,452				11,087	11,452
Current Liabilities	902				1,651				902	1,651
Noncurrent Liabilities	2,056				1,969				2,056	1,969
Long-Term Debt	2,685				2,805				2,685	2,805
Member's Equity	5,444				5,027				5,444	5,027
Total Liabilities and Member's Equity	11,087				11,452				11,087	11,452
Net Cash Provided By (Used In) Operating Activities									1,812	1,566	1,658
Net Cash Provided By (Used In) Investing Activities									(578)	(1,205)	(652)
Net Cash Provided By (Used In) Financing Activities									(1,233)	(414)	(982)
Power Senior Notes [Member] | Power [Member]
Operating Revenues									0	0	0
Operating Expenses									5	9	4
Operating Income (Loss)									(5)	(9)	(4)
Equity Earnings (Losses) of Subsidiaries									1,175	1,182	1,208
Other Income									40	45	57
Other Deductions									(28)	(4)	(14)
Other-Than-Temporary Investments									(1)	0	0
Interest Expense									(146)	(113)	(145)
Income Tax Benefit (Expense)									63	42	87
Income (Loss) on Discontinued Operations, net of Tax									0	0	0
Net Income (Loss)									1,098	1,143	1,189
Current Assets	4,311				3,988				4,311	3,988
Property, Plant and Equipment, net	66				55				66	55
Investment in Subsidiaries	4,185				4,794				4,185	4,794
Noncurrent Assets	179				170				179	170
Total Assets	8,741				9,007				8,741	9,007
Current Liabilities	172				751				172	751
Noncurrent Liabilities	440				423				440	423
Long-Term Debt	2,685				2,805				2,685	2,805
Member's Equity	5,444				5,028				5,444	5,028
Total Liabilities and Member's Equity	8,741				9,007				8,741	9,007
Net Cash Provided By (Used In) Operating Activities									609	467	383
Net Cash Provided By (Used In) Investing Activities									596	(252)	490
Net Cash Provided By (Used In) Financing Activities									(1,205)	(216)	(873)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member]
Operating Revenues									7,452	7,746	7,932
Operating Expenses									5,673	5,760	5,846
Operating Income (Loss)									1,779	1,986	2,086
Equity Earnings (Losses) of Subsidiaries									92	(15)	(20)
Other Income									195	170	256
Other Deductions									(51)	(49)	(120)
Other-Than-Temporary Investments									(19)	(9)	(60)
Interest Expense									(56)	(67)	(73)
Income Tax Benefit (Expense)									(762)	(834)	(861)
Income (Loss) on Discontinued Operations, net of Tax									0	0	0
Net Income (Loss)									1,178	1,182	1,208
Current Assets	7,248				6,807				7,248	6,807
Property, Plant and Equipment, net	5,715				5,385				5,715	5,385
Investment in Subsidiaries	804				1,079				804	1,079
Noncurrent Assets	1,557				1,549				1,557	1,549
Total Assets	15,324				14,820				15,324	14,820
Current Liabilities	9,549				8,519				9,549	8,519
Noncurrent Liabilities	1,589				1,510				1,589	1,510
Long-Term Debt	0				0				0	0
Member's Equity	4,186				4,791				4,186	4,791
Total Liabilities and Member's Equity	15,324				14,820				15,324	14,820
Net Cash Provided By (Used In) Operating Activities									2,427	2,249	2,520
Net Cash Provided By (Used In) Investing Activities									(1,171)	(1,567)	(1,320)
Net Cash Provided By (Used In) Financing Activities									(1,256)	(687)	(1,202)
Power Senior Notes [Member] | Other Subsidiaries [Member]
Operating Revenues									146	125	122
Operating Expenses									150	139	125
Operating Income (Loss)									(4)	(14)	(3)
Equity Earnings (Losses) of Subsidiaries									0	0	0
Other Income									0	0	1
Other Deductions									0	0	0
Other-Than-Temporary Investments									0	0	0
Interest Expense									(18)	(22)	(23)
Income Tax Benefit (Expense)									14	14	7
Income (Loss) on Discontinued Operations, net of Tax									97	7	(2)
Net Income (Loss)									89	(15)	(20)
Current Assets	951				1,117				951	1,117
Property, Plant and Equipment, net	950				902				950	902
Investment in Subsidiaries	0				0				0	0
Noncurrent Assets	51				41				51	41
Total Assets	1,952				2,060				1,952	2,060
Current Liabilities	1,003				849				1,003	849
Noncurrent Liabilities	145				129				145	129
Long-Term Debt	0				0				0	0
Member's Equity	804				1,082				804	1,082
Total Liabilities and Member's Equity	1,952				2,060				1,952	2,060
Net Cash Provided By (Used In) Operating Activities									(284)	28	10
Net Cash Provided By (Used In) Investing Activities									594	(34)	(50)
Net Cash Provided By (Used In) Financing Activities									(309)	(40)	66
Power Senior Notes [Member] | Consolidating Adjustments [Member]
Operating Revenues									(1,455)	(1,313)	(1,282)
Operating Expenses									(1,456)	(1,313)	(1,284)
Operating Income (Loss)									1	0	2
Equity Earnings (Losses) of Subsidiaries									(1,267)	(1,167)	(1,188)
Other Income									(45)	(45)	(81)
Other Deductions									0	0	(1)
Other-Than-Temporary Investments									0	0	0
Interest Expense									45	45	80
Income Tax Benefit (Expense)									0	0	0
Income (Loss) on Discontinued Operations, net of Tax									(1)	0	0
Net Income (Loss)									(1,267)	(1,167)	(1,188)
Current Assets	(9,823)				(8,468)				(9,823)	(8,468)
Property, Plant and Equipment, net	0				0				0	0
Investment in Subsidiaries	(4,989)				(5,873)				(4,989)	(5,873)
Noncurrent Assets	(118)				(94)				(118)	(94)
Total Assets	(14,930)				(14,435)				(14,930)	(14,435)
Current Liabilities	(9,822)				(8,468)				(9,822)	(8,468)
Noncurrent Liabilities	(118)				(93)				(118)	(93)
Long-Term Debt	0				0				0	0
Member's Equity	(4,990)				(5,874)				(4,990)	(5,874)
Total Liabilities and Member's Equity	(14,930)				(14,435)				(14,930)	(14,435)
Net Cash Provided By (Used In) Operating Activities									(940)	(1,178)	(1,255)
Net Cash Provided By (Used In) Investing Activities									(597)	648	228
Net Cash Provided By (Used In) Financing Activities									$ 1,537	$ 529	$ 1,027