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OTHER CONTINGENCIES AND COMMITMENTS (Oakland Headquarters Lease) (Details) ft² in Thousands, $ in Millions | Jun. 30, 2025 USD ($) | Jul. 11, 2024 USD ($) | Mar. 31, 2024 USD ($) ft² | Dec. 31, 2023 USD ($) | Jul. 11, 2023 USD ($) | Oct. 23, 2020 ft²
--- | --- | --- | --- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |  |  |  |
Financing lease, right of use asset, net |  |  | $ 781 |  |  |
Accumulated amortization |  |  | 85 |  |  |
Leasehold improvements |  |  | 207 |  |  |
Leasehold incentives |  |  | 126 |  |  |
Current financing lease liabilities |  |  | 271 | $ 259 |  |
Noncurrent financing lease liabilities |  |  | 553 | 554 |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Current financing lease liabilities |  |  | 271 | 259 |  |
Noncurrent financing lease liabilities |  |  | $ 553 | $ 554 |  |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Rentable square feet | ft² |  |  | 715 |  |  | 910
Purchase price |  |  |  |  | $ 906 |
Purchase price, deposits |  |  |  |  | $ 150 |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) | Forecast |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Purchase price, deposits | $ 506 | $ 250 |  |  |  |
Purchase price, deposits credit | $ 172 |  |  |  |  |
All But Vehicle Lease Agreements |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Noncurrent financing lease liabilities |  |  | $ 552 |  |  |

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