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OTHER CONTINGENCIES AND COMMITMENTS (Transmission Owner Rate) (Details)
$ in Millions
Jul. 22, 2021
petition
Sep. 21, 2018
Sep. 30, 2021
USD ($)
Jun. 21, 2021
petition
Apr. 15, 2021
party
May 21, 2020
Transmission Owner Rate Case Revenue            
Loss Contingencies [Line Items]            
Approved depreciation rate           2.94%
Requested depreciation rate           3.25%
Labor rates, allocation percentage           6.15%
Direct assignment, percentage           8.84%
Number of petitions for review to be consolidated (petition) | petition 2     2    
Petition review, pending substantive order duration 75 days          
Regulatory liabilities     $ 308      
Regulatory assets     $ 180      
Pacific Gas & Electric Co (Utility) | Transmission Owner Rate Case Revenue            
Loss Contingencies [Line Items]            
Number of parties granted for rehearing related to Tax Act | party         2  
Pacific Gas & Electric Co (Utility) | Electric            
Loss Contingencies [Line Items]            
Requested revenue rate   98.85%