Regulatory Assets And Liabilities (Schedule Of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2018
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	$ 369	$ 351
Regulatory Assets, Noncurrent	3,872	3,677
Regulatory Liability, Current	294	234
Regulatory Liabilities, Noncurrent	2,707	3,002
Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	369	351
Regulatory Assets, Noncurrent	3,872	3,677
Total Regulatory Assets	4,241	4,028
Regulatory Liability, Current	294	234
Regulatory Liabilities, Noncurrent	2,707	3,002
Total Regulatory Liabilities	3,001	3,236
Flowback of tax benefits	31	58
Tax Adjustment Credit [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	5	12
Excess Deferred Income Taxes [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	223	193
Regulatory Liabilities, Noncurrent	2,670	2,955
Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	2	15
Electric and Gas Cost Of Removal [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent	37	47
Other [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	27	4
ZEC Liability | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current	17	10
Tax Adjustment Credit [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Total Regulatory Assets			$ 581
Total Regulatory Liabilities			$ 581
New Jersey Clean Energy Program [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	143	143
Green Program Recovery Charge [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	139	118
Pension and Other Postretirement Benefit Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	1,489	1,284
Deferred Income Taxes [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	1,014	966
Manufactured Gas Plant (MGP) Remediation Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	320	357
Base Rate Case [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	56	56
Regulatory Assets, Noncurrent	103	159
Remediation Adjustment Charge (Other SBC) [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	134	158
Conditional Asset Retirement Obligation [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	184	172
Electric and Gas Cost Of Removal [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	189	216
Unamortized Loss On Reacquired Debt And Debt Expense [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	36	42
Other [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	5	13
Regulatory Assets, Noncurrent	88	166
Underrecovered Electric Costs Basic Generation Service [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	60	57
Societal Benefits Charges Sbc [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	82	30
Formula Rate True up | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current	23	52
Deferred Storm Costs | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	99	12
COVID-19 Deferral | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	51	0
Gas Costs - BGSS | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent	26	27
Regulatory Liability, Current	$ 20	0
Transmission related over remaining useful life [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded		$ 940