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Rate Filings (Details) - PSE And G [Member] $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 | Dec. 31, 2017
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 35.00%
Proposed BGSS rate per therm |  |  | 0.15 |  |
BGSS Revenue Reduction |  |  | $ 104 |  |
Transmission Formula Rate [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 148 |  |  |
Electric Distribution [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | 71 |  |
Gas Distribution [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | 43 |  |
Subsequent Event [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% |
BGSS Revenue Reduction | $ 15 |  |  |  |
Subsequent Event [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 55 |  |  |  |
2016 to 2017 [Member] | Subsequent Event [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | 31 |  |  |  |
2015 to 2016 [Member] | Subsequent Event [Member] | Gas Weather Normalization Deferral [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 24 |  |  |  |
Energy Strong program [Member] | Electric Distribution [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | 8 |  |
Solar or EE Recovery Charge (RRC) [Member] | Electric Distribution [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | 20 |  |
Solar or EE Recovery Charge (RRC) [Member] | Gas Distribution [Member] |  |  |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ (1) |  |

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