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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)
Mar. 31, 2024
USD ($)
legalAction
May 31, 2023
USD ($)
Feb. 29, 2016
USD ($)
federal_action
Loss Contingencies [Line Items]      
Unaccrued amounts of reasonably possible range of losses $ 100,000,000    
Number of federal actions | federal_action     3
Federal home loan bank stock 336,000,000    
Carrying value of collateral pledged for federal home loan bank 9,500,000,000    
Commitments by the company to provide equity financing 1,100,000,000    
Commitments under existing mortgage loan agreements 627,000,000    
Letter of Credit      
Loss Contingencies [Line Items]      
Undrawn balance 17,000,000    
Trust Notes      
Loss Contingencies [Line Items]      
Line of credit facility, maximum borrowing capacity 10,000,000,000    
Funding Agreement-Backed Commercial Paper Program      
Loss Contingencies [Line Items]      
Long-term line of credit outstanding $ 675,000,000    
Funding Agreement-Backed Commercial Paper Program | Commercial Paper      
Loss Contingencies [Line Items]      
Long-term line of credit outstanding   $ 3,000,000,000  
New York      
Loss Contingencies [Line Items]      
Number of actions | legalAction 1    
Brach Family Foundation Litigation      
Loss Contingencies [Line Items]      
Liability for future policy benefits, face value of policy     $ 1,000,000