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GENERAL INFORMATION AND OTHER FINANCIAL DATA - WILDFIRE FUND AND CONTINUATION ACCOUNT (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2026
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Loss Contingencies [Line Items]            
Wildfire fund continuation account, additional liquidity           $ 18,000
Subsequent Event            
Loss Contingencies [Line Items]            
IOU expected aggregate reimbursements, 2019 and 2021 wildfires $ 1,380          
IOU expected aggregate reimbursements, LA wildfires $ 859          
San Diego Gas and Electric Company            
Loss Contingencies [Line Items]            
Wildfire fund asset   $ 239   $ 239    
Accelerated amortization of wildfire fund asset   $ 5 $ 2 $ 10 $ 2