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Deposits - Summary (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Savings and demand deposits $ 332,747 $ 279,221
Time deposits 14,827 31,561
Total 347,574 310,782
Deposits subject to FDIC insurance 230,894 234,211
Deposits not subject to FDIC insurance 116,680 76,571
Time deposits that equal or exceed the FDIC insurance limit $ 0 $ 16