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WILDFIRE-RELATED CONTINGENCIES (Insurance) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Apr. 29, 2021
Jun. 30, 2021
Sep. 30, 2021
Aug. 31, 2020
Loss Contingencies [Line Items]        
Prepaid Insurance     $ 537  
Insurance premium costs, recovery, coverage amount     1,400  
Insurance Coverage for Wildfire Events        
Loss Contingencies [Line Items]        
Initial self-insured retention per occurrence     60  
Insurance Coverage for Wildfire Events | April 13, 2021 to April 1, 2022        
Loss Contingencies [Line Items]        
Liability insurance coverage $ 268      
Reinsurance 32      
Costs for insurance coverage $ 220      
Insurance Coverage for Wildfire Events | July 1, 2020 to July 1, 2021        
Loss Contingencies [Line Items]        
Reinsurance       $ 11
Insurance Coverage for Wildfire Events | August 1, 2020 to August 1, 2021        
Loss Contingencies [Line Items]        
Liability insurance coverage       $ 600
Insurance Coverage for Wildfire Events | August 1, 2021 to August 1, 2022        
Loss Contingencies [Line Items]        
Costs for insurance coverage     $ 516  
Insurance Coverage for Wildfire Events | June 1, 2021 to April 1, 2022        
Loss Contingencies [Line Items]        
Costs for insurance coverage   $ 89    
Insurance Coverage For Non-Wildfire Events        
Loss Contingencies [Line Items]        
Initial self-insured retention per occurrence   10    
Insurance Coverage For Non-Wildfire Events | April 13, 2021 to April 1, 2022        
Loss Contingencies [Line Items]        
Liability insurance coverage   50    
Insurance Coverage For Non-Wildfire Events | August 1, 2020 to August 1, 2021        
Loss Contingencies [Line Items]        
Liability insurance coverage   140    
Insurance Coverage For Non-Wildfire Events | June 1, 2021 to April 1, 2022        
Loss Contingencies [Line Items]        
Liability insurance coverage   535    
Insurance Coverage For Non-Wildfire Events | Extension to April 1, 2022        
Loss Contingencies [Line Items]        
Costs for insurance coverage   $ 30