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Regulatory Assets And Liabilities (Significant Orders and Pending Filings) (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Oct. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Aug. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum U.S. Corporate Income Tax Rate |  |  |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current BGSS rate per therm |  |  |  |  |  | 0.35 |  |  |  |  |  |  |  |
Proposed BGSS rate per therm |  |  | 0.32 |  |  | 0.34 |  |  |  |  |  | 0.32 |  |
Self-implementing rate reduction |  |  | $ 0.02 |  |  |  |  |  |  |  |  |  |  |
ZEC Charge per kwh |  |  |  |  |  |  |  |  |  |  |  | $ 0.004 |  |
Zero Emission Certificate purchases |  |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |
Zero Emission Certificate overcollections |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |
Distribution Base rates [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | $ (13,000,000) |  |  |
Public Utilities, Approved Rate Base |  |  |  |  |  |  |  |  |  |  | $ 9,500,000,000 |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  |  |  |  |  |  |  | 54.00% |  |  |
Revenue Subject to Refund [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | $ (28,000,000) |  |  |
Transmission Formula Rate [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  | $ 332,000,000 |  |  | $ 52,000,000 |  |  |  |  |  |
Gas Distribution [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ (43,000,000) |
Gas System Modernization Program [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |
Electric Distribution [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ (71,000,000) |
Weather Normalization Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | $ 14,000,000 |  |  |  |
Electric Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |  |
Gas Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |
Remediation Adjustment Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  | $ 73,000,000 |  |  |  |  |  |  |
BGSS [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | (34,000,000) |  |  |  |  |  |  |  |
Gas System Modernization Program II [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |
Energy Efficiency Green Program Administrative Costs [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-implementing bill credit | $ 0.075 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Societal Benefits Charge Electric Distribution [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ (27,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Societal Benefits Charge Gas Distribution [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | (7,000,000) |  |  |  |  |  |  |  |  |  |  |  |
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 |  | (15,000,000) |  |  |  |  |  |  |  |  |  |  |  |
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 |  | (10,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Electric Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | 52,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Gas Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Remediation Adjustment Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 53,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Energy Efficiency Green Program Recovery [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 111,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Energy Efficiency Green Program Administrative Costs [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 to 2019 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ (8,000,000) |  |  |  |  |  |  |  |
2017 to 2018 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | (9,000,000) |  |  |  |
2016 to 2017 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |
Base Revenues [Member] | Distribution Base rates [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | 212,000,000 |  |  |
Return of Tax Benefits [Member] | Distribution Base rates [Member] | Public Service Electric and Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | $ (225,000,000) |  |  |

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