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DERIVATIVES - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Loss on derivatives arising during period $ 18  
Loss released 17  
Deferred loss 2  
Cash and securities collateral for derivative contract 5,900 $ 3,800
Cash and securities collateral 100 212
S&P 500, Russell 1000, NASDAQ 100 and Emerging Market Indices    
Derivative [Line Items]    
Initial margin requirements 138 135
Us Treasury Notes Ultra Long Bonds And Euro Dollar    
Derivative [Line Items]    
Initial margin requirements 53 263
Euro Stoxx, FTSE100, Topix, ASX200 and EAFE Indices    
Derivative [Line Items]    
Initial margin requirements $ 16 $ 35