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BORROWINGS - Summary of Long-Term Borrowings (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 935 $ 270
Subordinated notes 88 87
Junior subordinated debt 66 111
Other subordinated debt 249 159
Total long-term borrowings $ 1,338 $ 627