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WILDFIRE-RELATED CONTINGENCIES (Potential Losses in Connection with the 2018 Camp Fire and 2017 Northern California Wildfires) (Details) insurance_claim in Thousands, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 08, 2019 USD ($) | Sep. 06, 2018 USD ($) insurance_claim | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($)
November 2018 Fires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total insurance claims received by insurers | $ 12,000 |  |  |  |  |
2018 Camp fire |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total insurance claims received by insurers | 8,600 |  |  |  |  |
Loss in period |  |  | $ 1,900 | $ 12,400 | $ 10,500 |
2017 Northern California wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total insurance claims received by insurers |  | $ 12,280 |  |  |  |
Insurance claims received by insurers (insurance claim) | insurance_claim |  | 55 |  |  |  |
Statewide insurance claims related to wildfire |  | $ 10,000 |  |  |  |
2018 Camp Fire and 2017 Northern California Wildfires |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total insurance claims received by insurers | $ 18,600 |  |  |  |  |
Estimate of possible losses |  |  | $ 30,000 | $ 30,000 |  |
Pacific Gas & Electric Co | San Bruno Natural Gas Explosion |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss in period |  |  |  |  |  | $ 1,600
Loss contingency liability |  |  |  |  |  | $ 558

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