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Deposits - Summary (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Deposits [Abstract]    
Savings and demand deposits $ 277,398 $ 288,252
Time deposits 71,492 63,552
Total 348,890 351,804
Deposits subject to FDIC insurance 278,178 276,598
Deposits not subject to FDIC insurance $ 70,712 $ 75,206