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OTHER CONTINGENCIES AND COMMITMENTS (Oakland Headquarters Lease and Sale of SFGO) (Details) ft² in Thousands, $ in Millions |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 17, 2021 USD ($) | May 21, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 23, 2020 USD ($) | Jun. 05, 2020 USD ($) ft²
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |
Rentable square feet (sqft) | ft² |  |  |  |  |  | 910
Lease, option payment letter of credit |  |  |  |  | $ 75 |
Lease, security letter of credit |  |  |  |  | $ 75 |
Term of contract |  |  |  |  |  | 34 years 11 months
Purchase options, land, value |  |  |  |  |  | $ 892
Loss Contingencies [Line Items] |  |  |  |  |  |
Operating lease right of use asset |  |  | $ 1,316 | $ 1,741 |  |
Hines Atlas US LP |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Operating lease right of use asset |  |  | 7 |  |  |
Office space |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 800 |  |  |  |
Net cash proceeds | $ 749 |  |  |  |  |
Reduction to property plant and equipment |  |  | 565 |  |  |
Reduction to accumulated depreciation |  |  | 238 |  |  |
Pre-tax gain on sale of building |  |  | $ 422 |  |  |

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