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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts and Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Public Utility, Property, Plant and Equipment [Line Items]      
Credit losses $ 100 $ 70  
Regulatory assets 15,551   $ 15,561
Regulatory Balancing Accounts Receivable      
Public Utility, Property, Plant and Equipment [Line Items]      
Total regulatory balancing accounts 5,852   7,227
FERC TO rates      
Public Utility, Property, Plant and Equipment [Line Items]      
Regulatory assets 91   85
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable      
Public Utility, Property, Plant and Equipment [Line Items]      
Total regulatory balancing accounts 72   $ 260
Decrease in regulatory balancing accounts $ 260