Income Taxes (Deferred Income Tax) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
OPEB	$ 283	$ 256
Related to Uncertain Tax Positions	155	160
Deferred Tax Assets - Securitization Overcollection	0	27
Total Noncurrent Assets	438	443
Plant-Related Items	6,593	6,174
New Jersey Corporate Business Tax	674	615
Leasing Activities	565	612
Pension Costs	197	218
AROs and NDT Fund	398	393
Taxes Recoverable Through Future Rate (net)	208	191
Deferred Tax Liabilities, Other	212	244
Total Non-Current Liabilities	8,847	8,447
Accumulated Deferred Investment Tax Credit	249	162
Net Total Noncurrent Deferred Income Taxes and ITC	8,658	8,166
Deferred Tax Liabilities, Net, Noncurrent	8,409	8,004
PSE&G [Member]
Income Taxes [Line Items]
OPEB	189	164
Deferred Tax Assets - Securitization Overcollection	0	27
Total Noncurrent Assets	189	191
Plant-Related Items	4,983	4,435
New Jersey Corporate Business Tax	385	312
Conservation Costs	33	40
Pension Costs	252	262
Taxes Recoverable Through Future Rate (net)	208	191
Deferred Tax Liabilities, Other	118	54
Total Non-Current Liabilities	5,979	5,294
Accumulated Deferred Investment Tax Credit	83	78
Net Total Noncurrent Deferred Income Taxes and ITC	5,873	5,181
Deferred Tax Liabilities, Net, Noncurrent	5,790	5,103
Power [Member]
Income Taxes [Line Items]
Contractual Liabilities & Environmental Costs	18	18
Related to Uncertain Tax Positions	53	47
Other	76	0
Total Noncurrent Assets	215	121
Plant-Related Items	1,605	1,736
New Jersey Corporate Business Tax	214	243
AROs and NDT Fund	400	395
Deferred Tax Liabilities, Other	0	10
Total Non-Current Liabilities	2,219	2,384
Accumulated Deferred Investment Tax Credit	166	84
Net Total Noncurrent Deferred Income Taxes and ITC	2,170	2,347
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	68	56
Deferred Tax Liabilities, Net, Noncurrent	$ 2,004	$ 2,263