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SECURITIES - Schedule of Securities Pledged (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law $ 4,547 $ 3,818
Pledged against FHLB borrowed funds 227 394
Pledged against repurchase agreements 1 224
Fair Value    
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law 4,556 3,937
Pledged against FHLB borrowed funds 239 423
Pledged against repurchase agreements $ 1 $ 231