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WILDFIRE-RELATED CONTINGENCIES (2018 Camp Fire and 2017 Northern California Wildfires Accounting Charge) (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 23, 2019 USD ($) | Jun. 30, 2019 USD ($) wildfire | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) wildfire | Dec. 31, 2018 USD ($)
2018 Camp fire |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued losses |  | $ 1,900 |  |  | $ 12,400 | $ 10,500
2017 Northern California wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of fires with probable losses (wildfire) | wildfire |  | 21 |  |  | 21 |
Loss from claims related to wildfire |  | $ 2,000 | $ 1,000 | $ 2,500 | $ 5,500 | $ 3,500
2017 Northern California Wildfires, other than Tubbs and 37 Fires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of fires with probable losses (wildfire) | wildfire |  | 19 |  |  | 19 |
Number of fires with probable losses, as previously determined (wildfire) | wildfire |  | 17 |  |  | 17 |
2017 Northern California Wildfires, Youngs and Pressley Fires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of fires with probable losses (wildfire) | wildfire |  | 2 |  |  | 2 |
2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss from claims related to wildfire |  |  |  |  | $ 17,900 |
2018 Camp Fire and 2017 Northern California Wildfires, Clean-up and Fire Suppression Costs |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss from claims related to wildfire |  |  |  |  | 900 |
Subrogated Insurance Claimholders | 2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss from claims related to wildfire |  |  |  |  | 8,500 |
Individual Claimholders | 2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss from claims related to wildfire |  |  |  |  | 7,500 |
Supporting Public Entities | 2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss from claims related to wildfire |  |  |  |  | $ 1,000 |
Subsequent Event | Subrogated Insurance Claimholders | 2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Insurance claims (in excess of) | $ 20,000 |  |  |  |  |
Plan of reorganization, settlement value of insurance claims | $ 15,800 |  |  |  |  |

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