Regulatory Assets And Liabilities (Schedule Of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		$ 351	$ 389
Regulatory Assets, Noncurrent		3,677	3,399
Regulatory Liability, Current		234	311
Regulatory Liabilities, Noncurrent		3,002	3,221
Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		351	389
Regulatory Assets, Noncurrent		3,677	3,399
Total Regulatory Assets		4,028	3,788
Regulatory Liability, Current		234	311
Regulatory Liabilities, Noncurrent		3,002	3,221
Total Regulatory Liabilities		3,236	3,532
Flowback of tax benefits		58	15
Tax Adjustment Credit [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current		12	4
Excess Deferred Income Taxes [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current		193	299
Regulatory Liabilities, Noncurrent		2,955	3,170
Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current		15	0
Gas Margin Adjustment Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current		5	8
Electric and Gas Cost Of Removal [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent		47	51
Other [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current		9	0
Tax Adjustment Credit [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Total Regulatory Assets				$ 581
Total Regulatory Liabilities		537	575	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, Current		10	34
Regulatory Assets, Noncurrent		118	95
Pension and Other Postretirement Benefit Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		1,284	1,090
Deferred Income Taxes [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		966	896
Manufactured Gas Plant (MGP) Remediation Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		357	321
Base Rate Case [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		56	56
Regulatory Assets, Noncurrent		159	214
Remediation Adjustment Charge (Other SBC) [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		158	175
Conditional Asset Retirement Obligation [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		172	166
Electric and Gas Cost Of Removal [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		216	223
Unamortized Loss On Reacquired Debt And Debt Expense [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		42	49
Other [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		55	32
Regulatory Assets, Noncurrent		178	139
Underrecovered Electric Costs Basic Generation Service [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		57	115
Societal Benefits Charges Sbc [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current		30	9
Overrecovered Gas and Electric Costs - BGSS and BGS [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent		27	31
Distribution related [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded				705
Distribution 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				1,100
Distribution related [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded		$ 1,600	$ 1,800
Transmission related over one year [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded				150
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				$ 977
Subsequent Event [Member] | Tax Adjustment Credits Electric Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ (15)
Subsequent Event [Member] | Tax Adjustment Credits Gas Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ (10)