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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details)
Dec. 31, 2020
USD ($)
Feb. 29, 2016
USD ($)
legalAction
federalAction
Loss Contingencies [Line Items]    
Unaccrued amounts of reasonably possible range of losses $ 100,000,000  
Federal home loan bank stock 322,000,000  
Carrying value of collateral pledged for federal home loan bank 8,700,000,000  
Trust Notes    
Loss Contingencies [Line Items]    
Line of credit facility, maximum borrowing capacity 5,000,000,000  
Brach Family Foundation Litigation    
Loss Contingencies [Line Items]    
Liability for future policy benefits, face value of policy   $ 1,000,000
Letter of Credit    
Loss Contingencies [Line Items]    
Undrawn balance 17,000,000  
Equitable Financial    
Loss Contingencies [Line Items]    
Number of federal actions | federalAction   5
Equitable Financial | New York    
Loss Contingencies [Line Items]    
Number of actions | legalAction   3
AXA    
Loss Contingencies [Line Items]    
Commitments by the Company to provide equity financing 1,200,000,000  
Commitments under existing mortgage loan agreements 389,000,000  
Affiliated Entity | AXA    
Loss Contingencies [Line Items]    
Commitments by the Company to provide equity financing $ 253,000,000