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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS - Parenthetical (Details) - Debt securities available-for-sale - USD ($)
$ in Billions
Sep. 30, 2024
Dec. 31, 2023
Asset pledged as collateral    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities $ 12.9 $ 12.0
Debt securities served as collateral for public funds 12.1 11.1
Asset Not Pledged as Collateral    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities $ 4.2 $ 4.6