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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) ft² in Thousands, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) ft² | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2025 USD ($) | Jul. 11, 2024 USD ($) | Jul. 11, 2023 USD ($) | Oct. 23, 2020 USD ($) ft²
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Cash payments for financing lease |  | $ 315 | $ 142 |  |  |  |  |
Financing lease, right of use asset, net |  | 807 | 787 |  |  |  |  |
Accumulated amortization |  | 282 | 108 |  |  |  |  |
Leasehold improvements |  | 136 | 218 |  |  |  |  |
Leasehold incentives |  | 51 | 134 |  |  |  |  |
Financing lease liabilities |  | 577 | 259 |  |  |  |  |
Financing lease liabilities |  | $ 4 | $ 554 |  |  |  |  |
Weighted average remaining lease term, finance lease |  | 6 months | 1 year 7 months 6 days |  |  |  |  |
Weighted average discount rate, finance lease |  | 6.20% | 6.50% |  |  |  |  |
Lease payments |  | $ 1,600 | $ 1,900 | $ 2,300 |  |  |  |
Weighted average remaining lease term. operating lease |  | 7 years 6 months | 8 years 2 months 12 days |  |  |  |  |
Weighted average discount rate, operating lease |  | 6.50% | 6.40% |  |  |  |  |
Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Financing lease liabilities |  | $ 577 | $ 259 |  |  |  |  |
Financing lease liabilities |  | $ 4 | $ 554 |  |  |  |  |
Pacific Gas & Electric Co (Utility) | Forecast |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Cash payments for financing lease | $ 591 |  |  |  |  |  |  |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Rentable square feet | ft² |  | 715 |  |  |  |  |  | 910
Lease, option payment letter of credit |  |  |  |  |  |  |  | $ 75
Lease, security letter of credit |  |  |  |  |  |  |  | $ 75
Purchase price |  |  |  |  |  |  | $ 906 |
Purchase price, deposits |  |  |  |  |  | $ 250 | $ 150 |
Oakland Headquarters Lease | Pacific Gas & Electric Co (Utility) | Forecast |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Purchase price, deposits |  |  |  |  | $ 506 |  |  |
Purchase price, deposits credit |  |  |  |  | $ 172 |  |  |
All But Vehicle Lease Agreements |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Financing lease liabilities |  | $ 575 |  |  |  |  |  |

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