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SECURITIES - Schedule of Securities Pledged (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Amortized Cost    
Pledged against repurchase agreements $ 53 $ 224
Pledged against FHLB borrowed funds 322 394
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law 3,677 3,818
Fair Value    
Pledged against repurchase agreements 55 231
Pledged against FHLB borrowed funds 340 423
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law $ 3,725 $ 3,937