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Investment Securities - Narrative (Details)
12 Months Ended
Apr. 01, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Financing Receivable, Impaired [Line Items]        
Debt securities, available-for-sale transferred to held-to-maturity $ 2,720,000,000      
Net unamortized unrealized holding (losses) gains on available for sale investment securities transferred to held to maturity $ 537,400,000 $ (537,434,000) $ 0 $ 0
Number of investment securities in a loss position for less than twelve months | security   82    
Number of investment securities in a loss position for twelve months or longer | security   211    
Allowance for credit loss   $ 0    
Collateral Pledged        
Financing Receivable, Impaired [Line Items]        
AFS pledged to secure deposits   2,830,000,000 $ 5,190,000,000  
HTM pledged to secure deposits   $ 2,450,000,000