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Rate Filings (Details) - Public Service Electric and Gas Company [Member] | 1 Months Ended | 6 Months Ended
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Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($)
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
True-up adjustment for Transmission Formula Rate Revenues | $ 52,000,000 |  |  |  | $ 52,000,000
ZEC Charge per kwh |  |  |  |  | $ 0.004
Current BGSS rate per therm | 0.35 |  |  |  | 0.35
Proposed BGSS rate per therm | 0.34 |  |  |  | 0.34
Electric Green Program Recovery [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 52,000,000 |  |  |  |
Gas Green Program Recovery [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | 11,000,000 |  |  |  |
Gas System Modernization Program II [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | 20,000,000 |  |  |  |
Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ (14,000,000) |
Gas System Modernization Program [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 11,000,000 |  |
BGSS [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ (13,000,000) |  |  |
2016 to 2017 [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | (23,000,000) |
2017 to 2018 [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ 9,000,000 |
2018 to 2019 [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 8,000,000 |  |  |  |

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