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OTHER CONTINGENCIES AND COMMITMENTS (Order Instituting Investigation Narrative) (Details) $ in Millions | Sep. 30, 2021 USD ($) | Jan. 04, 2021 party | Jun. 08, 2020 party | Apr. 20, 2020 USD ($) | Dec. 17, 2019 USD ($)
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Loss Contingencies [Line Items] |  |  |  |  |
Expenses and capital expenditures, disallowed costs | $ 1,625 |  |  |  |
Expenses and capital expenditures, disallowed capital, approved |  |  |  | $ 198 |
Shareholder-funded system enhancement initiatives, approved |  |  |  | 64 |
Fine payable to general fund, suspended |  |  |  | $ 200 |
Number of parties filed separate applications for rehearing (party) | party |  |  | 2 |  |
Number of parties filed petition for review of decision (party) | party |  | 1 |  |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expenses and capital expenditures | $ 1,625 |  |  |  |
Pacific Gas & Electric Co (Utility) | Pending Litigation | Unfavorable Regulatory Action |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Expenses and capital expenditures |  |  |  |  | $ 1,625
Shareholder-funded system enhancement initiatives, amount |  |  |  |  | $ 50

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