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OTHER CONTINGENCIES AND COMMITMENTS (Transmission Owner Rate) (Details) $ in Millions | Jul. 22, 2021 petition | Sep. 21, 2018 | Sep. 30, 2021 USD ($) | Jun. 21, 2021 petition | Apr. 15, 2021 party | May 21, 2020
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Transmission Owner Rate Case Revenue |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Approved depreciation rate |  |  |  |  |  | 2.94%
Requested depreciation rate |  |  |  |  |  | 3.25%
Labor rates, allocation percentage |  |  |  |  |  | 6.15%
Direct assignment, percentage |  |  |  |  |  | 8.84%
Number of petitions for review to be consolidated (petition) | petition | 2 |  |  | 2 |  |
Petition review, pending substantive order duration | 75 days |  |  |  |  |
Regulatory liabilities |  |  | $ 308 |  |  |
Regulatory assets |  |  | $ 180 |  |  |
Pacific Gas & Electric Co (Utility) | Transmission Owner Rate Case Revenue |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of parties granted for rehearing related to Tax Act | party |  |  |  |  | 2 |
Pacific Gas & Electric Co (Utility) | Electric |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Requested revenue rate |  | 98.85% |  |  |  |

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