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SHORT-TERM AND LONG-TERM DEBT - Holdings Revolving Credit Facility,Bilateral Letter of Credit Facilities, AB Credit Facility Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 24, 2024
USD ($)
Dec. 15, 2023
USD ($)
Feb. 28, 2018
USD ($)
Sep. 30, 2024
uncommittedLineOfCredit
Dec. 31, 2024
USD ($)
uncommittedLineOfCredit
financialInstitution
Dec. 31, 2023
USD ($)
uncommittedLineOfCredit
Jan. 23, 2024
USD ($)
Jan. 22, 2024
USD ($)
Jun. 30, 2021
USD ($)
SCB Line of Credit                  
Debt Instrument [Line Items]                  
Number of uncommitted line of credit | uncommittedLineOfCredit         3 5      
Number of financial institutions | financialInstitution         3        
Number of matured uncommitted line of credit | uncommittedLineOfCredit       2          
Revolving Credit Facility | Holdings Revolving Credit Facility                  
Debt Instrument [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 | Credit Suisse Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity $ 1,500,000,000                
Extinguishment of debt, amount $ 75,000,000                
Revolving Credit Facility | AB Revolver Credit Facility                  
Debt Instrument [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                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity         150,000,000        
Letters of credit outstanding         $ 0 $ 0      
Number of uncommitted line of credit | uncommittedLineOfCredit         2        
Average outstanding amount         $ 1,000,000 $ 1,000,000      
Interest rate         8.50% 7.80%      
Letter of Credit                  
Debt Instrument [Line Items]                  
Remaining capacity         $ 17,000,000        
Letter of Credit | Holdings Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 1,500,000,000   1,500,000,000 $ 1,500,000,000      
Remaining capacity         0 95,000,000      
Letter of Credit | Bilateral Letter Of Credit Facilities                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity     $ 1,900,000,000            
Debt instrument, face amount             $ 200,000,000 $ 150,000,000  
Line of Credit | AB Uncommitted Line of Credit                  
Debt Instrument [Line Items]                  
Letters of credit outstanding         $ 0 $ 0