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SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - Federal agencies and U.S. government sponsored entities - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Less than 12 Months $ 1,991 $ 5,135
12 Months or Longer 0 3,748
Total 1,991 8,883
Gross Unrealized Losses    
Less than 12 Months (19) (24)
12 Months or Longer 0 (52)
Total $ (19) $ (76)