Income Taxes (Deferred Income Tax) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Regulatory Liability Excess Deferred Tax	$ 485	$ 539
OPEB	135	151
Related to Uncertain Tax Positions	29	97
Deferred Tax Asset, Interest Carryforward	39	76
Deferred Tax Asset, Operating Leases	60	64
Other	170	128
Total Noncurrent Assets	918	1,055
Plant-Related Items	5,163	5,051
New Jersey Corporate Business Tax	1,016	876
Leasing Activities	133	284
Pension Costs	97	98
Deferred Tax Liabilities, Operating Leases	55	59
AROs and NDT Fund	324	277
Taxes Recoverable Through Future Rate (net)	114	108
Deferred Tax Liabilities, Other	247	273
Total Noncurrent Liabilities	7,149	7,026
Accumulated Deferred Investment Tax Credit	271	285
Net Total Noncurrent Deferred Income Taxes and ITC	6,502	6,256
Deferred Tax Liabilities, Net, Noncurrent	6,231	5,971
Public Service Electric and Gas Company
Income Taxes [Line Items]
Regulatory Liability Excess Deferred Tax	485	539
OPEB	82	97
Related to Uncertain Tax Positions	0	42
Deferred Tax Asset, Operating Leases	21	21
Other	92	55
Total Noncurrent Assets	680	754
Plant-Related Items	3,874	3,754
New Jersey Corporate Business Tax	721	588
Conservation Costs	61	44
Pension Costs	166	160
Deferred Tax Liabilities, Operating Leases	21	21
Deferred Tax Liabilities, Uncertain Tax Positions	5	0
Taxes Recoverable Through Future Rate (net)	114	108
Deferred Tax Liabilities, Other	161	183
Total Noncurrent Liabilities	5,123	4,858
Accumulated Deferred Investment Tax Credit	81	85
Net Total Noncurrent Deferred Income Taxes and ITC	4,524	4,189
Deferred Tax Liabilities, Net, Noncurrent	4,443	4,104
PSEG Power LLC
Income Taxes [Line Items]
OPEB	41	40
Contractual Liabilities & Environmental Costs	6	7
Related to Uncertain Tax Positions	38	72
Deferred Tax Asset, Interest Carryforward	6	12
Deferred Tax Asset, Operating Leases	13	15
Pension Costs	68	61
Other	36	30
Total Noncurrent Assets	208	237
Plant-Related Items	1,286	1,292
New Jersey Corporate Business Tax	308	282
Deferred Tax Liabilities, Operating Leases	13	15
AROs and NDT Fund	325	278
Deferred Tax Liabilities, Other	21	45
Total Noncurrent Liabilities	1,953	1,912
Accumulated Deferred Investment Tax Credit	191	201
Net Total Noncurrent Deferred Income Taxes and ITC	1,936	1,876
Deferred Tax Liabilities, Net, Noncurrent	$ 1,745	$ 1,675