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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