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WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire, 2020 Zogg Fire and 2021 Dixie Fire) (Details) $ in Thousands, numberOfPeople in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 18, 2022 USD ($) | Jan. 05, 2022 USD ($) | Oct. 29, 2021 USD ($) a | Nov. 04, 2019 numberOfPeople | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 28, 2022 USD ($) | Apr. 21, 2022 numberOfPlaintiff complaint numberOfClaimHolder plaintiff | Apr. 11, 2022 USD ($) notice | Apr. 08, 2022 USD ($) position | Jan. 28, 2022 notice | Jan. 27, 2022 notice | Dec. 02, 2021 transmissionLine | Nov. 18, 2021 notice | Sep. 24, 2021 misdemeanor felony | Aug. 31, 2021 USD ($) | Jul. 13, 2021 a structure numberOfFatality | May 11, 2021 count | Apr. 06, 2021 felony misdemeanor | Sep. 27, 2020 a injury fatality structure | Oct. 23, 2019 a injury structure numberOfFatality
2019 Kincade fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,758
Number of fatalities (fatality) | numberOfFatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Number of injuries | injury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 374
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60
Number of people part of mandatory evacuation order | numberOfPeople |  |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies (felony) | notice |  |  |  |  |  |  |  |  |  |  | 5 | 2 |  |  |  |  |  |  |  |  |
Number of misdemeanors dropped (misdemeanor) | notice |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Number of transmission lines | transmissionLine |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |  |  |
Loss contingency liability |  |  |  |  | $ 765,000 | $ 769,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fire fighting costs recovery requested |  | $ 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential loss contingency |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  |  | 430,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Kincade fire | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stipulation costs payable |  |  |  |  |  |  |  |  |  | $ 20,250 |  |  |  |  |  |  |  |  |  |  |
Number of new positions headquartered (position) | position |  |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |
Number of complaints (complaint) | complaint |  |  |  |  |  |  |  | 103 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs represented by complaints | plaintiff |  |  |  |  |  |  |  | 2,656 |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Kincade fire | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of demurrer filed (count) | count |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 |  |  |
Number of criminal complaints (count) | count |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |
Loss contingency liability |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, costs incurred |  |  |  |  | 85,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Kincade fire | Pacific Gas & Electric Co (Utility) | Sonoma Contry District Attorney |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies (felony) | felony |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Number of misdemeanors (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |
2020 Zogg fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,338 |
Number of fatalities (fatality) | fatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Number of injuries | injury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204 |
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |
Number of demurrer filed (count) | notice |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |
Number of criminal complaints (count) | notice |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 |  |  |  |  |  |  |
Loss contingency liability |  |  |  |  | 177,000 | 211,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fire suppression and other costs | $ 34,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential loss contingency |  |  |  |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  | 611,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  |  | 338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial self-insured retention per occurrence |  |  |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees |  |  |  |  | 23,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Zogg fire | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints (complaint) | complaint |  |  |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs represented by complaints | numberOfPlaintiff |  |  |  |  |  |  |  | 449 |  |  |  |  |  |  |  |  |  |  |  |  |
Zogg Complaint, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies (felony) | felony |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Number of misdemeanors (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
2021 Dixie fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 963,309 |  |  |  |
Number of fatalities (fatality) | numberOfFatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,329 |  |  |  |
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95 |  |  |  |
Loss contingency, costs incurred |  |  | $ 630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential loss contingency |  |  |  |  |  | $ 1,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivable |  |  |  |  | 562,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of residential structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 717 |  |  |  |
Number of commercial structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143 |  |  |  |
Number of other structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 443 |  |  |  |
Probable of recovery |  |  |  |  | 1,164,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie fire | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stipulation costs payable |  |  |  |  |  |  |  |  | $ 34,750 |  |  |  |  |  |  |  |  |  |  |  |
Number of new positions headquartered (position) | notice |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints (complaint) | numberOfClaimHolder |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs represented by complaints | numberOfClaimHolder |  |  |  |  |  |  |  | 1,122 |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie fire | FERC TO rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable of recovery |  |  |  |  | 102,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie fire | WEMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable of recovery |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie fire | National Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  | 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie fire | National Forrest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  | 685,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zogg Fire, 2020 and Dixie Fire, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Coverage for Wildfire Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |
Initial self-insured retention per occurrence |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Coverage for Wildfire Events | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage |  |  |  |  |  |  | $ 340,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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