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Rate Filings (Details) - Public Service Electric and Gas Company [Member] $ in Millions | 1 Months Ended
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Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($)
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Proposed BGSS rate per therm |  | 0.32 |  |  |  |
Transmission Formula Rate [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ (38) |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  | $ 24 |
Transition Renewable Incentive Certificates [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ 23 |  |  |
Electric Green Program Recovery [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  | 67 |
Gas Green Program Recovery [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  | $ 20 |
Gas System Modernization Program II [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | 18 |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 20 |  |  |  |
Tax Adjustment Credits Electric Distribution [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | (25) |  |
Flowback of unprotected tax benefits total |  |  |  |  |  | $ 50
Flowback of unprotected tax benefits current year |  |  |  |  |  | 10
Tax Adjustment Credits Gas Distribution [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ (29) |  |
Flowback of unprotected tax benefits total |  |  |  |  |  | 46
Flowback of unprotected tax benefits current year |  |  |  |  |  | $ 19
COVID-19 deferrals [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Regulatory Assets |  | 35 |  |  |  |
Remediation Adjustment Charge [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | 53 |  |  |  |
Subsequent Event [Member] | Transmission Formula Rate [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 119 |  |  |  |  |
Subsequent Event [Member] | Tax Adjustment Credits Electric Distribution [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | (23) |  |  |  |  |
Subsequent Event [Member] | Tax Adjustment Credits Gas Distribution [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 49 |  |  |  |  |
2019 to 2020 [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ 10 |  |  |  |

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