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Other Material Contingencies - Manhattan Explosion and Fire (Details) $ in Millions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 12, 2014 building people | Feb. 28, 2017 USD ($) | Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) lawsuit | Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Accrued regulatory liability |  |  |  | $ 4,569 | $ 4,827
Settlement of Gas Proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued regulatory liability |  |  |  | $ 22 | $ 10
Manhattan Explosion and Fire |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of buildings destroyed by fire | building | 2 |  |  |  |
Number of people died in explosion and fire incident | people | 8 |  |  |  |
Number of people injured in explosion and fire incident (more than) | people | 50 |  |  |  |
Amount of costs that will not recover from customers |  | $ 126 |  |  |
Number of pending lawsuits | lawsuit |  |  |  | 80 |
Manhattan Explosion and Fire | Subsequent Event |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  |  | $ 40 |  |
Insurance receivable |  |  | $ 40 |  |
Manhattan Explosion and Fire | Settlement of Gas Proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued regulatory liability |  | $ 27 |  |  |

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