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Deposits and Borrowings - Deposits and Short-term Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Deposits:      
Non-interest-bearing deposits $ 34,003 $ 31,142  
Interest-bearing deposits 276,325 274,300  
Total deposits 310,328 305,442 $ 269,689
Short-term borrowings      
Short-term borrowings 842 668  
Time deposits, at or above FDIC insurance limit 3,000 4,200  
Federal funds purchased and securities loaned or sold under agreements to repurchase      
Short-term borrowings      
Short-term borrowings $ 842 $ 668