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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts and Credit Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]      
Credit losses $ 636 $ 143 $ 154
Regulatory assets 17,189 16,443  
Regulatory Balancing Accounts Receivable      
Public Utility, Property, Plant and Equipment [Line Items]      
Total regulatory balancing accounts 5,660 3,264  
COVID-19 pandemic protection memorandum account, undercollection bad debt      
Public Utility, Property, Plant and Equipment [Line Items]      
Regulatory assets 5 4  
FERC TO rates      
Public Utility, Property, Plant and Equipment [Line Items]      
Regulatory assets 78    
Regulatory assets   8  
COVID-19 Pandemic protection memorandum account      
Public Utility, Property, Plant and Equipment [Line Items]      
Regulatory assets 17 26  
Regulatory assets   3  
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable      
Public Utility, Property, Plant and Equipment [Line Items]      
Total regulatory balancing accounts $ 507 $ 126