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BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 239 $ 251
Federal Home Loan Bank advances 1,805 2,230
Federal funds purchased 1,957 1,535
Subordinated notes 110 113
Total short-term borrowings $ 4,111 $ 4,129