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OTHER CONTINGENCIES AND COMMITMENTS (Oakland Headquarters Lease) (Details) ft² in Thousands, $ in Millions | Jun. 30, 2025 USD ($) | Jul. 11, 2024 USD ($) | Jul. 11, 2023 USD ($) | Jun. 30, 2023 USD ($) ft² | Dec. 31, 2022 USD ($) | Oct. 23, 2020 USD ($) ft²
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Operating Leased Assets [Line Items] |  |  |  |  |  |
Term of contract |  |  |  |  |  | 34 years 11 months
Operating lease right of use asset |  |  |  | $ 1,418 | $ 1,311 |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease right of use asset |  |  |  | $ 1,418 | $ 1,311 |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Rentable square feet | ft² |  |  |  | 659 |  | 910
Lease, option payment letter of credit |  |  |  |  |  | $ 75
Lease, security letter of credit |  |  |  |  |  | $ 75
Operating lease right of use asset |  |  |  | $ 735 |  |
Leasehold improvements |  |  |  | 262 |  |
Leasehold incentives |  |  |  | 178 |  |
Operating lease, right-of-use liability |  |  |  | $ 913 |  |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) | Forecast |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Purchase price, deposits | $ 506 | $ 250 |  |  |  |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) | Subsequent Event |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Purchase price |  |  | $ 906 |  |  |
Purchase price, deposits |  |  | $ 150 |  |  |

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