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SECURITIES - Schedule of Securities Pledged (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Pledged against repurchase agreements, Amortized Cost $ 224 $ 265
Pledged against FHLB borrowed funds, Amortized Cost 394 638
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law, Amortized Cost 3,818 3,670
Pledged against repurchase agreements, Fair Value 231 266
Pledged against FHLB borrowed funds, Fair Value 423 662
Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law, Fair Value $ 3,937 $ 3,672