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WILDFIRE-RELATED CONTINGENCIES (2019 Kincade Fire, 2020 Zogg Fire and 2021 Dixie Fire) (Details) numberOfPeople in Millions, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Oct. 22, 2021 USD ($) a | Oct. 18, 2021 USD ($) | Nov. 04, 2019 numberOfPeople | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 29, 2021 USD ($) complaint civil_case numberOfPlaintiff | Oct. 27, 2021 numberOfClaimHolder plaintiff complaint | Sep. 24, 2021 felony death misdemeanor | Jul. 25, 2021 a | Jul. 18, 2021 a fuse structure fatality | May 11, 2021 count | Apr. 06, 2021 felony misdemeanor firefighter_structure minor | Sep. 27, 2020 a structure fatality injury | Oct. 23, 2019 a structure numberOfFatality injury customer
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance settlements receivable | $ |  |  |  | $ 1,314.0 |  |  | $ 1,314.0 | $ 674.0 |  |  |  |  |  |  |  |  |
Number of felonies counts of involuntary manslaughter (felony) | felony |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Probable of recovery | $ |  |  |  |  |  |  | 1,156.0 |  |  |  |  |  |  |  |  |  |
FERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable of recovery | $ |  |  |  |  |  |  | 98.0 |  |  |  |  |  |  |  |  |  |
WEMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable of recovery | $ |  |  |  |  |  |  | 339.0 |  |  |  |  |  |  |  |  |  |
Noncurrent assets – other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wildfire fund receivables | $ |  |  |  | 150.0 |  |  | 150.0 |  |  |  |  |  |  |  |  |  |
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) | injury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 374
Number of residences destroyed (residence) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 174
Number of commercial structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11
Number of other buildings destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60
Number of residential structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35
Number of commercial structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Number of other structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24
Number of people part of mandatory evacuation order (people) | numberOfPeople |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers without power (customer) | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,837
Potential loss contingency | $ |  |  |  |  |  | $ 800.0 | 800.0 | 625.0 |  |  |  |  |  |  |  |  |
Potential loss contingency, additional | $ |  |  |  |  |  | 175.0 |  |  |  |  |  |  |  |  |  |  |
Insurance settlements receivable | $ |  |  |  | 414.0 |  |  | 414.0 | 430.0 |  |  |  |  |  |  |  |  |
2019 Kincade Fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaint (complaint) | complaint |  |  |  |  |  |  |  |  |  | 64 |  |  |  |  |  |  |
Number of plaintiffs represented by complaints (plaintiff) | plaintiff |  |  |  |  |  |  |  |  |  | 1,377 |  |  |  |  |  |  |
Fire fighting costs recovery requested | $ |  | $ 90.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement, proposed payment to California General Fund | $ |  |  |  |  |  |  |  |  | $ 40.0 |  |  |  |  |  |  |  |
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 |  |  |
2019 Kincade Fire | Sonoma Contry District Attorney | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies (felony) | felony |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
Number of misdemeanors (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of firefighters and/or burned inhabited and other structures (firefighter/structure) | firefighter_structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Number of felonies counts of emission of air contaminants (felony) | felony |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of minors (minor) | minor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of misdemeanors related to carelessly or negligently throwing or placing substances that may cause a fire (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of misdemeanors related to negligently causing a fire (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of misdemeanors related to violation by a public utility (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of misdemeanors related to recklessly or negligently emitting air contaminants (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |
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) | injury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204 |
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Potential loss contingency | $ |  |  |  |  | $ 375.0 |  | 375.0 | 275.0 |  |  |  |  |  |  |  |  |
Potential loss contingency, additional | $ |  |  |  |  | $ 75.0 | $ 25.0 |  |  |  |  |  |  |  |  |  |  |
Insurance settlements receivable | $ |  |  |  | 331.0 |  |  | 331.0 | 219.0 |  |  |  |  |  |  |  |  |
Number of single family homes destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63 |
Number of count related to unlawfully causing a fire (count) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire by device (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to failure to comply with regulations (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Liability insurance coverage | $ |  |  |  | 611.0 |  |  | 611.0 |  |  |  |  |  |  |  |  |  |
Initial self-insured retention per occurrence | $ |  |  |  | 60.0 |  |  | 60.0 |  |  |  |  |  |  |  |  |  |
Legal fees | $ |  |  |  |  |  |  | 16.0 |  |  |  |  |  |  |  |  |  |
2020 Zogg Fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaint (complaint) | complaint |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |
Number of plaintiffs represented by complaints (plaintiff) | numberOfPlaintiff |  |  |  |  |  |  |  |  | 315 |  |  |  |  |  |  |  |
Number of civil cases (civil case) | civil_case |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
2020 Zogg Fire | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage | $ |  |  |  |  |  |  |  | 867.5 |  |  |  |  |  |  |  |  |
Zogg Complaint, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fatalities (fatality) | death |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Number of felonies (felony) | felony |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Number of misdemeanors (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of misdemeanors related to recklessly or negligently emitting air contaminants (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Number of felonies counts of recklessly causing a fire to property of another (felony) | felony |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to failure to maintain firebreak (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to failure to maintain firebreak (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of count related to unlawfully causing a fire (count) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire by device (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of misdemeanors related to failure to comply with regulations (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of misdemeanors related to recklessly emitting air contamination that results in an unreasonable risk of great bodily injury (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Daniel Fire, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Ponder Fire, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of count related to unlawfully causing a fire (count) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to negligently causing a fire by device (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of misdemeanors related to failure to comply with regulations (misdemeanor) | misdemeanor |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Woody Fire, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of felonies counts of recklessly causing a fire (felony) | felony |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
2021 Dixie Fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  |  |  |  |  |  |  |  |  |  |  | 963,309 |  |  |  |
Number of fatalities (fatality) | fatality |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  | 1,329 |  |  |  |
Number of structures damaged (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  | 95 |  |  |  |
Potential loss contingency | $ |  |  |  | 1,150.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance settlements receivable | $ |  |  |  | 569.0 |  |  | 569.0 | $ 0.0 |  |  |  |  |  |  |  |  |
Number of residential structures destroyed (structure) | structure |  |  |  |  |  |  |  |  |  |  |  |  | 717 |  |  |  |
Number of fuses opened (fuse) | fuse |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of fuses (fuse) | fuse |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Insurance receivable | $ |  |  |  | 569.0 |  |  | 569.0 |  |  |  |  |  |  |  |  |  |
2021 Dixie Fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaint (complaint) | numberOfClaimHolder |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |
Number of plaintiffs represented by complaints (plaintiff) | numberOfClaimHolder |  |  |  |  |  |  |  |  |  | 676 |  |  |  |  |  |  |
Costs incurred | $ | $ 630.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie Fire | Subsequent event | National Park |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a | 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dixie Fire | Subsequent event | National Forrest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a | 685,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Fly Fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acres burned (acre) | a |  |  |  |  |  |  |  |  |  |  |  | 4,300 |  |  |  |  |
Percentage of fire contained |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Zogg Fire, 2020 and Dixie Fire, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability insurance coverage | $ |  |  |  | $ 900.0 |  |  | $ 900.0 |  |  |  |  |  |  |  |  |  |

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