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DEPOSITS - Major Components of Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deposits, by Type [Abstract]    
Demand $ 29,233 $ 29,458
Checking with interest 24,840 23,067
Regular savings 13,779 12,007
Money market accounts 38,725 35,701
Term deposits 18,736 19,342
Total deposits $ 125,313 $ 119,575