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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Wildfire Fund) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) contribution | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) contribution | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 12, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Expected capitalization, proceeds of bond | $ 10,500 |  | $ 10,500 |  |  | $ 10,500
Expected capitalization, initial contribution | 7,500 |  | 7,500 |  |  | 7,500
Expected capitalization, annual contribution | $ 300 |  | $ 300 |  |  | $ 300
Expected wildfire fund allocation metric, percentage | 64.20% |  | 64.20% |  |  |
Expected wildfire fund allocation metric, initial contribution | $ 4,800 |  | $ 4,800 |  |  |
Expected wildfire fund allocation metric, annual contributions | 193 |  | 193 |  |  |
Initial contribution payment | 4,800 |  | 4,800 |  |  |
Annual contribution, first payment | 193 |  | 193 |  |  |
Annual contribution, second payment | $ 193 |  | $ 193 |  |  |
Number of remaining annual contributions | contribution | 8 |  | 8 |  |  |
Wildfire fund, current asset | $ 461 |  | $ 461 |  | $ 464 |
Wildfire fund, noncurrent asset | 5,428 |  | 5,428 |  | 5,816 |
Wildfire Fund expense | $ 162 | $ 120 | $ 399 | $ 293 |  |
Monte carlo simulation, historical data, period |  |  | 12 years |  |  |
Amortization period |  |  | 6 years |  |  |
Percentage assumption change | 10.00% |  | 10.00% |  |  |
Greater effectiveness, amortization period |  |  | 17 years |  |  |
Less effectiveness, amortization period |  |  | 12 years |  |  |
Litigation Settlement, Expense |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accelerated amortization |  |  | $ 42 |  |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire fund, current asset | $ 461 |  | 461 |  | 464 |
Wildfire fund, noncurrent asset | 5,428 |  | 5,428 |  | $ 5,816 |
Wildfire Fund expense | 162 | $ 120 | $ 399 | $ 293 |  |
5 year period |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Historical data period |  |  | 5 years |  |  |
Average annual statewide claims or settlements | 6,500 |  | $ 6,500 |  |  |
12 year period |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Historical data period |  |  | 12 years |  |  |
Average annual statewide claims or settlements | 2,900 |  | $ 2,900 |  |  |
Wildfire Fund asset |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 15 years |  |  |
Current liabilities - other |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation liability, current | 193 |  | $ 193 |  |  |
Noncurrent liabilities – other |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire fund, noncurrent | 1,300 |  | 1,300 |  |  |
Noncurrent assets – other |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire fund receivables | $ 150 |  | $ 150 |  |  |

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