Income Taxes (Deferred Income Tax) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Deferred Tax Liabilities, Regulatory Assets and Liabilities	$ 602	$ 0
OPEB	217	283
Related to Uncertain Tax Positions	142	155
Total Noncurrent Assets	961	438
Plant-Related Items	4,257	6,593
New Jersey Corporate Business Tax	674	674
Leasing Activities	384	565
Pension Costs	123	197
AROs and NDT Fund	233	398
Taxes Recoverable Through Future Rate (net)	80	208
Deferred Tax Liabilities, Other	171	212
Total Non-Current Liabilities	5,922	8,847
Accumulated Deferred Investment Tax Credit	279	249
Net Total Noncurrent Deferred Income Taxes and ITC	5,240	8,658
Deferred Tax Liabilities, Net, Noncurrent	4,961	8,409
PSE&G [Member]
Income Taxes [Line Items]
Deferred Tax Liabilities, Regulatory Assets and Liabilities	602	0
OPEB	116	189
Total Noncurrent Assets	718	189
Plant-Related Items	3,311	4,983
New Jersey Corporate Business Tax	378	385
Conservation Costs	24	33
Pension Costs	152	252
Taxes Recoverable Through Future Rate (net)	80	208
Deferred Tax Liabilities, Other	86	118
Total Non-Current Liabilities	4,031	5,979
Accumulated Deferred Investment Tax Credit	78	83
Net Total Noncurrent Deferred Income Taxes and ITC	3,391	5,873
Deferred Tax Liabilities, Net, Noncurrent	3,313	5,790
Power [Member]
Income Taxes [Line Items]
Contractual Liabilities & Environmental Costs	12	18
Related to Uncertain Tax Positions	45	53
Other	93	76
Total Noncurrent Assets	190	215
Plant-Related Items	935	1,605
New Jersey Corporate Business Tax	225	214
AROs and NDT Fund	235	400
Total Non-Current Liabilities	1,395	2,219
Accumulated Deferred Investment Tax Credit	201	166
Net Total Noncurrent Deferred Income Taxes and ITC	1,406	2,170
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions	40	68
Deferred Tax Liabilities, Net, Noncurrent	$ 1,205	$ 2,004