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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Current Regulatory Balancing Accounts, Net) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts $ 2,575 $ 3,169
Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 5,852 7,227
Electric distribution | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 1,823 1,591
Electric transmission | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 692 883
Electric transmission | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 131 117
Gas distribution and transmission | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 273 72
Gas distribution and transmission | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 149 387
Energy procurement | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 358 329
Energy procurement | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 961 1,066
Public purpose programs | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 547 882
Public purpose programs | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 275 162
SFGO sale | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 21 93
Wildfire-related accounts | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 225 337
Wildfire-related accounts | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 879 979
Insurance premium costs | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 0 38
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 72 260
Catastrophic event memorandum account | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 401 500
General rate case memorandum accounts | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 835 1,113
Nuclear decommissioning adjustment mechanism | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 21 23
Other | Regulatory Balancing Accounts Payable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts 438 550
Other | Regulatory Balancing Accounts Receivable    
Regulatory Assets [Line Items]    
Total regulatory balancing accounts $ 326 $ 1,014