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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 |  |  |  |  |  |  |

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