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BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 405 $ 278
Federal Home Loan Bank advances 1,380 2,255
Federal funds purchased 0 575
Subordinated notes 114 108
Total short-term borrowings $ 1,899 $ 3,216