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WILDFIRE-RELATED CONTINGENCIES (Insurance) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 29, 2021 | Jun. 30, 2021 | Sep. 30, 2021 | Aug. 31, 2020
Loss Contingencies [Line Items] |  |  |  |
Prepaid Insurance |  |  | $ 537 |
Insurance premium costs, recovery, coverage amount |  |  | 1,400 |
Insurance Coverage for Wildfire Events |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Initial self-insured retention per occurrence |  |  | 60 |
Insurance Coverage for Wildfire Events | April 13, 2021 to April 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability insurance coverage | $ 268 |  |  |
Reinsurance | 32 |  |  |
Costs for insurance coverage | $ 220 |  |  |
Insurance Coverage for Wildfire Events | July 1, 2020 to July 1, 2021 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance |  |  |  | $ 11
Insurance Coverage for Wildfire Events | August 1, 2020 to August 1, 2021 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability insurance coverage |  |  |  | $ 600
Insurance Coverage for Wildfire Events | August 1, 2021 to August 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Costs for insurance coverage |  |  | $ 516 |
Insurance Coverage for Wildfire Events | June 1, 2021 to April 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Costs for insurance coverage |  | $ 89 |  |
Insurance Coverage For Non-Wildfire Events |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Initial self-insured retention per occurrence |  | 10 |  |
Insurance Coverage For Non-Wildfire Events | April 13, 2021 to April 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability insurance coverage |  | 50 |  |
Insurance Coverage For Non-Wildfire Events | August 1, 2020 to August 1, 2021 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability insurance coverage |  | 140 |  |
Insurance Coverage For Non-Wildfire Events | June 1, 2021 to April 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability insurance coverage |  | 535 |  |
Insurance Coverage For Non-Wildfire Events | Extension to April 1, 2022 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Costs for insurance coverage |  | $ 30 |  |

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