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Deposits - Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Deposits [Abstract]    
Savings and demand deposits $ 288,453 $ 288,252
Time deposits 64,041 63,552
Total 352,494 351,804
Deposits subject to FDIC insurance 276,557 276,598
Deposits not subject to FDIC insurance $ 75,937 $ 75,206