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DERIVATIVES - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Cash and securities collateral for derivative contract $ 5,000 $ 3,000
Cash and securities collateral 14 72
S&P 500, Russell 1000, NASDAQ 100 and Emerging Market Indices    
Derivative [Line Items]    
Initial margin requirements 205 58
Us Treasury Notes Ultra Long Bonds And Euro Dollar    
Derivative [Line Items]    
Initial margin requirements 314 165
Euro Stoxx, FTSE100, Topix, ASX200 and EAFE Indices    
Derivative [Line Items]    
Initial margin requirements $ 40 $ 60