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SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) - Federal agencies and U.S. government sponsored entities - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Less than 12 Months $ 682 $ 1,991
12 Months or Longer 11,969 0
Total 12,651 1,991
Gross Unrealized Losses    
Less than 12 Months (21) (19)
12 Months or Longer (284) 0
Total $ (305) $ (19)