Income Taxes (Deferred Income Tax) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Current (net)	$ 0	$ 43
Current (net)	170	0
Net Total Noncurrent Deferred Income Taxes and ITC	5,458	5,129
PSEG [Member]
Current (net)	0	43
Unrecovered Investment Tax Credit	15	18
Accumulated Other Comprehensive Income (Loss)	39	79
Cumulative Effect of a Change in Accounting Principle	11	11
New Jersey Corporate Business Tax	0	17
OPEB	208	197
Cost of Removal	51	51
Contractual Liabilities & Environmental Costs	35	35
MTC	26	47
Related to Uncertain Tax Positions	104	73
Other	44	58
Total Noncurrent Assets	533	586
Total Assets	533	629
Current (net)	170	0
Plant-Related Items	3,894	3,169
New Jersey Corporate Business Tax	180	0
Nuclear Decommissioning	155	171
Securitization	495	686
Leasing Activities	527	839
Partnership Activity	18	18
Conservation Costs	97	62
Energy Clause Recoveries	0	76
Pension Costs	129	189
AROs	302	287
Taxes Recoverable Through Future Rate (net)	158	158
Other	0	18
Total Non-Current Liabilities	5,955	5,673
Total Liabilities	6,125	5,673
Net Current Deferred Income Tax Assets	0	43
Net Current Deferred Income Tax Liabilities	170	0
Net Noncurrent Deferred Income Tax Liabilities	5,422	5,087
Investment Tax Credit (ITC)	36	42
Net Total Noncurrent Deferred Income Taxes and ITC	5,458	5,129
Power [Member]
Accumulated Other Comprehensive Income (Loss)	39	40
Cumulative Effect of a Change in Accounting Principle	11	11
New Jersey Corporate Business Tax	0	73
Pension Costs	53	12
Cost of Removal	51	51
Contractual Liabilities & Environmental Costs	35	35
Related to Uncertain Tax Positions	4	0
Other	22	38
Total Noncurrent Assets	215	260
Total Assets	215	260
Current (net)	53	64
Plant-Related Items	1,013	927
New Jersey Corporate Business Tax	7	0
Nuclear Decommissioning	155	171
AROs	302	287
Related to Uncertain Tax Positions	0	16
Total Non-Current Liabilities	1,477	1,401
Total Liabilities	1,530	1,465
Net Current Deferred Income Tax Liabilities	53	64
Net Noncurrent Deferred Income Tax Liabilities	1,262	1,141
Investment Tax Credit (ITC)	4	5
Net Total Noncurrent Deferred Income Taxes and ITC	1,266	1,146
PSE&G [Member]
Unrecovered Investment Tax Credit	10	12
OPEB	197	189
MTC	26	47
Related to Uncertain Tax Positions	30	24
Other	13	5
Total Noncurrent Assets	276	277
Total Assets	276	277
Current (net)	32	19
Plant-Related Items	2,875	2,216
New Jersey Corporate Business Tax	146	0
Securitization	495	686
Conservation Costs	97	62
Energy Clause Recoveries	0	76
Pension Costs	151	172
Taxes Recoverable Through Future Rate (net)	158	158
Total Non-Current Liabilities	3,922	3,370
Total Liabilities	3,954	3,389
Net Current Deferred Income Tax Assets	32	19
Net Noncurrent Deferred Income Tax Liabilities	3,646	3,093
Investment Tax Credit (ITC)	29	34
Net Total Noncurrent Deferred Income Taxes and ITC	$ 3,675	$ 3,127