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SHORT-TERM AND LONG-TERM DEBT - Credit Facility Narrative (Details)
 1 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Dec. 31, 2022
USD ($)
financialInstitution
uncommittedLineOfCredit
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 17,000,000    
Holdings Revolving Credit Facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 2,500,000,000     $ 1,500,000,000
Debt instrument, term 5 years      
Holdings Revolving Credit Facility | Letter of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 1,500,000,000 1,500,000,000    
Remaining capacity   225,000,000    
Bilateral Letter Of Credit Facilities | Letter of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 1,900,000,000      
AB Committed Unsecured Senior Revolving Credit Facility | 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    
AB Uncommitted Line of Credit | Line of Credit        
Line of Credit Facility [Line Items]        
Letters of credit outstanding   $ 0 $ 0  
SCB Line of Credit        
Line of Credit Facility [Line Items]        
Number of uncommitted line of credit | uncommittedLineOfCredit   5    
Number of financial institutions | financialInstitution   5    
SCB Line of Credit | Revolving Credit Facility        
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 $ 47,000  
Interest rate   3.70% 0.90%