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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) |  |  |

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