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SHORT-TERM AND LONG-TERM DEBT - Credit Facility Narrative (Details)
 1 Months Ended 12 Months Ended
Dec. 15, 2023
USD ($)
Feb. 28, 2018
USD ($)
Dec. 31, 2023
USD ($)
uncommittedLineOfCredit
financialInstitution
Dec. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
SCB Line of Credit          
Line of Credit Facility [Line Items]          
Number of uncommitted line of credit | uncommittedLineOfCredit     5    
Number of financial institutions | financialInstitution     5    
Revolving Credit Facility | Holdings Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity $ 1,600,000,000 $ 2,500,000,000     $ 1,500,000,000
Debt instrument, term   5 years      
Increase to line of credit facility $ 75,000,000        
Revolving Credit Facility | AB Committed Unsecured Senior Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity     $ 800,000,000    
Incremental borrowing base     200,000,000    
Revolving Credit Facility | SCB Line of Credit          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity     315,000,000    
Letters of credit outstanding     $ 0 $ 0  
Number of uncommitted line of credit | uncommittedLineOfCredit     4    
Average outstanding amount     $ 1,000,000 $ 1,000,000  
Interest rate     7.80% 3.70%  
Letter of Credit          
Line of Credit Facility [Line Items]          
Remaining capacity     $ 17,000,000    
Letter of Credit | Holdings Revolving Credit Facility          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 1,500,000,000 1,500,000,000    
Remaining capacity     95,000,000    
Letter of Credit | Bilateral Letter Of Credit Facilities          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 1,900,000,000      
Line of Credit | AB Uncommitted Line of Credit          
Line of Credit Facility [Line Items]          
Letters of credit outstanding     $ 0 $ 0