Income Taxes (Deferred Income Tax) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Regulatory Liability Excess Deferred Tax	$ 539	$ 606
OPEB	151	163
Related to Uncertain Tax Positions	97	71
Deferred Tax Asset, Interest Carryforward	76	0
Deferred Tax Asset, Operating Leases	64	0
Other	128	0
Total Noncurrent Assets	1,055	840
Plant-Related Items	5,051	4,817
New Jersey Corporate Business Tax	876	756
Leasing Activities	284	307
Pension Costs	98	111
Deferred Tax Liabilities, Operating Leases	59	0
AROs and NDT Fund	277	196
Taxes Recoverable Through Future Rate (net)	108	89
Deferred Tax Liabilities, Other	273	12
Total Non-Current Liabilities	7,026	6,288
Accumulated Deferred Investment Tax Credit	285	265
Net Total Noncurrent Deferred Income Taxes and ITC	6,256	5,713
Deferred Tax Liabilities, Net, Noncurrent	5,971	5,448
Public Service Electric and Gas Company
Income Taxes [Line Items]
Regulatory Liability Excess Deferred Tax	539	606
OPEB	97	114
Related to Uncertain Tax Positions	42	0
Deferred Tax Asset, Operating Leases	21	0
Other	55	0
Total Noncurrent Assets	754	720
Plant-Related Items	3,754	3,622
New Jersey Corporate Business Tax	588	486
Conservation Costs	44	36
Pension Costs	160	159
Deferred Tax Liabilities, Operating Leases	21	0
Taxes Recoverable Through Future Rate (net)	108	89
Deferred Tax Liabilities, Other	183	84
Total Non-Current Liabilities	4,858	4,476
Accumulated Deferred Investment Tax Credit	85	74
Net Total Noncurrent Deferred Income Taxes and ITC	4,189	3,830
Deferred Tax Liabilities, Net, Noncurrent	4,104	3,756
PSEG Power LLC
Income Taxes [Line Items]
OPEB	40	37
Contractual Liabilities & Environmental Costs	7	9
Related to Uncertain Tax Positions	72	60
Deferred Tax Asset, Interest Carryforward	12
Deferred Tax Asset, Operating Leases	15	0
Pension Costs	61	52
Other	30	61
Total Noncurrent Assets	237	219
Plant-Related Items	1,292	1,189
New Jersey Corporate Business Tax	282	260
Deferred Tax Liabilities, Operating Leases	15
AROs and NDT Fund	278	197
Deferred Tax Liabilities, Other	45	0
Total Non-Current Liabilities	1,912	1,646
Accumulated Deferred Investment Tax Credit	201	192
Net Total Noncurrent Deferred Income Taxes and ITC	1,876	1,619
Deferred Tax Liabilities, Net, Noncurrent	$ 1,675	$ 1,427