Regulatory Assets And Liabilities (Schedule Of Regulatory Assets and Liabilities) (Details) $ in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) $ / DTH	Dec. 31, 2017 USD ($)	Oct. 01, 2017	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					$ 211			$ 199
Regulatory Assets, Noncurrent					3,222			3,319
Regulatory Liability, Current					47			88
Regulatory Liabilities, Noncurrent					$ 2,948			118
PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Current BGSS rate per therm					0.34
Proposed BGSS rate per therm						0.37
True-up adjustment for Transmission Formula Rate Revenues					$ (16)		$ (12)
Deferred Storm and Property Reserve Deficiency, Noncurrent					220
Regulatory Assets, Current					211			199
Regulatory Assets, Noncurrent					3,222			3,319
Total Regulatory Assets					3,433			3,518
Regulatory Liability, Current					47			88
Regulatory Liabilities, Noncurrent					2,948			118
Total Regulatory Liabilities					2,995			206
Excess Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent					2,868			0
Reduction in Deferred Tax Liabilities					2,100
Solar and EE Recovery Charge formerly RRC and currently Green Program Recovery Charges (GPRC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current					3			28
Gas Margin Adjustment Clause [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current					12			11
FERC Formula Rate True-Up [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current					0			34
Overrecovered Gas and Electric Costs - BGSS and BGS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current					30			6
Electric and Gas Cost Of Removal [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent					80			94
Other [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liability, Current					2			9
Regulatory Liabilities, Noncurrent					0			4
New Jersey Clean Energy Program [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					128			142
Weather Normalization Clause [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					40			49
Solar and EE Recovery Charge formerly RRC and currently Green Program Recovery Charges (GPRC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					98			91
Public Utilities, Approved Additional Capital Expenditures			$ 69
Public Utilities, Approved Additional Costs			$ 16
Stranded Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					(5)
Pension and Other Postretirement Benefit Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					1,488			1,403
Deferred Income Taxes [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					282			507
Manufactured Gas Plant (MGP) Remediation Costs [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					358			403
Storm Damage Deferral [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					241			239
Remediation Adjustment Charge (Other SBC) [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					172			180
Conditional Asset Retirement Obligation [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					162			157
Electric and Gas Cost Of Removal [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					199			189
Unamortized Loss On Reacquired Debt And Debt Expense [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					55			61
Mark-To-Market Contracts [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Liabilities, Noncurrent					0			20
Other [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					8			6
Regulatory Assets, Noncurrent					121			89
Underrecovered Electric Costs Basic Generation Service [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					23			2
FERC Formula Rate True-Up [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Current					12			0
Regulatory Assets, Noncurrent					16			0
Overrecovered Gas and Electric Costs - BGSS and BGS [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets, Noncurrent					$ 30			$ 0
Transmission Formula Rate [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 212
Subsequent Event [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
BGSS Revenue Reduction				$ 100
Self Implementing Bill Credit per therm | $ / DTH				0.15
Subsequent Event [Member] | Transmission Formula Rate [Member] | PSE&G [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 148