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OTHER CONTINGENCIES AND COMMITMENTS (Transmission Owner Rate) (Details) - USD ($)
$ in Millions
61 Months Ended
Mar. 17, 2022
Sep. 21, 2018
Mar. 31, 2022
Transmission Owner Rate Case Revenue      
Loss Contingencies [Line Items]      
Regulatory liabilities     $ 339.0
Regulatory assets     207.0
Pacific Gas & Electric Co (Utility)      
Loss Contingencies [Line Items]      
Increase in regulatory liabilities     $ 62.5
Pacific Gas & Electric Co (Utility) | Electric      
Loss Contingencies [Line Items]      
Requested revenue rate   98.85%  
Requested return on equity rate 9.26%    
Requested return on equity rate, incentive component 0.50%    
Actual return on equity rate 9.76%