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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts and Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Public Utility, Property, Plant and Equipment [Line Items]          
Credit losses $ 141 $ 65 $ 241 $ 135  
Regulatory assets 15,853   15,853   $ 15,561
Regulatory Balancing Accounts Receivable          
Public Utility, Property, Plant and Equipment [Line Items]          
Total regulatory balancing accounts 5,657   5,657   7,227
FERC TO rates          
Public Utility, Property, Plant and Equipment [Line Items]          
Regulatory assets 90   90   85
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable          
Public Utility, Property, Plant and Equipment [Line Items]          
Total regulatory balancing accounts $ 146   146   $ 260
Decrease in regulatory balancing accounts     $ 260