Income Taxes (Deferred Income Tax) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Current (net)	$ 49	$ 0
Current (net)	72	170
Net Total Noncurrent Deferred Income Taxes and ITC	6,542	5,458
PSE&G [Member]
Current (net)	49	0
Unrecovered Investment Tax Credit	18	10
OPEB	189	197
MTC	18	26
Related to Uncertain Tax Positions	15	30
Other	42	13
Total Noncurrent Assets	282	276
Total Assets	331	276
Current (net)	60	32
Plant-Related Items	3,374	2,875
New Jersey Corporate Business Tax	253	146
Securitization	371	495
Conservation Costs	101	97
Pension Costs	189	151
Taxes Recoverable Through Future Rate (net)	165	158
Total Non-Current Liabilities	4,453	3,922
Total Liabilities	4,513	3,954
Net Current Deferred Tax Assets	49	0
Net Current Deferred Income Tax Liabilities	60	32
Net Noncurrent Deferred Income Tax Liabilities	4,171	3,646
Investment Tax Credit (ITC)	52	29
Net Total Noncurrent Deferred Income Taxes and ITC	4,223	3,675
PSEG [Member]
Current (net)	49	0
Unrecovered Investment Tax Credit	30	15
Accumulated Other Comprehensive Income (Loss)	40	39
Cumulative Effect of a Change in Accounting Principle	11	11
OPEB	200	208
Cost of Removal	51	51
Contractual Liabilities & Environmental Costs	35	35
MTC	18	26
Related to Uncertain Tax Positions	75	104
Capital Loss	35	0
Other	82	44
Total Noncurrent Assets	577	533
Total Assets	626	533
Current (net)	72	170
Plant-Related Items	4,685	3,894
New Jersey Corporate Business Tax	343	180
Nuclear Decommissioning	209	155
Securitization	371	495
Leasing Activities	656	527
Partnership Activity	17	18
Conservation Costs	101	97
Pension Costs	180	129
AROs	297	302
Taxes Recoverable Through Future Rate (net)	165	158
Total Non-Current Liabilities	7,024	5,955
Total Liabilities	7,096	6,125
Net Current Deferred Tax Assets	49	0
Net Current Deferred Income Tax Liabilities	72	170
Net Noncurrent Deferred Income Tax Liabilities	6,447	5,422
Investment Tax Credit (ITC)	95	36
Net Total Noncurrent Deferred Income Taxes and ITC	6,542	5,458
Power [Member]
Accumulated Other Comprehensive Income (Loss)	40	39
Cumulative Effect of a Change in Accounting Principle	11	11
Pension Costs	38	53
Cost of Removal	51	51
Contractual Liabilities & Environmental Costs	35	35
Related to Uncertain Tax Positions	27	4
Capital Loss	12	0
Other	2	22
Total Noncurrent Assets	216	215
Total Assets	216	215
Current (net)	16	53
Plant-Related Items	1,253	1,013
New Jersey Corporate Business Tax	28	7
Nuclear Decommissioning	209	155
AROs	297	302
Total Non-Current Liabilities	1,787	1,477
Total Liabilities	1,803	1,530
Net Current Deferred Income Tax Liabilities	16	53
Net Noncurrent Deferred Income Tax Liabilities	1,571	1,262
Investment Tax Credit (ITC)	4	4
Net Total Noncurrent Deferred Income Taxes and ITC	$ 1,575	$ 1,266