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DEPOSITS - Maturities of Term Deposits Greater than $100,000 (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Contractual Maturities, Time Deposits, $100,000 or More [Abstract]  
Three months or less $ 3,420
After three months through six months 956
After six months through twelve months 986
After twelve months 436
Total term deposits $ 5,798