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Investment Securities - Investment Securities, Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 12, 2023
USD ($)
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
security
loan
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]        
Federal home loan bank stock | $   $ 1,392,000,000 $ 1,267,000,000  
Federal reserve bank stock | $   203,000,000 176,000,000  
Gross unrealized loss | $   0 2,000,000 $ 0
Fair Value | $   9,145,000,000 9,060,000,000  
Corporate bonds        
Schedule of Investments [Line Items]        
Fair Value | $   $ 343,000,000 $ 885,000,000  
Signature Bank | Corporate bonds        
Schedule of Investments [Line Items]        
Fair Value | $ $ 20,000,000      
Collateralized Debt Obligations        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | loan   84 23  
Capital trust notes        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | security     5  
Number of securities continuous unrealized loss position more than twelve months | loan   6    
Asset-backed securities        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | security     7  
Number of securities continuous unrealized loss position more than twelve months | loan   8    
Corporate bonds        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | security     2  
Number of securities continuous unrealized loss position more than twelve months | loan   12    
Corporate bonds | Signature Bank        
Schedule of Investments [Line Items]        
Provision for credit loss | $ $ 20,000,000      
US Government Agencies Debt Securities        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | loan   37 33  
Mortgage- Related Securities        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | loan   302 133  
Mutual funds        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | security     1  
Number of securities continuous unrealized loss position more than twelve months | loan   1    
Municipal bonds        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | security     1  
Number of securities continuous unrealized loss position more than twelve months | loan   1    
Foreign notes        
Schedule of Investments [Line Items]        
Number of securities continuous unrealized loss position more than twelve months | loan   1    
Federal Home Loan Bank of New York        
Schedule of Investments [Line Items]        
Federal home loan bank stock | $   $ 861,000,000 $ 762,000,000  
Federal Home Loan Bank of Indianapolis        
Schedule of Investments [Line Items]        
Federal home loan bank stock | $   $ 329,000,000 $ 329,000,000