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Investment Securities - Investment Securities, Narrative (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
security
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
Schedule of Investments [Line Items]      
Federal home loan bank stock | $ $ 1,550,000,000   $ 1,392,000,000
Federal reserve bank stock | $ 203,000,000   203,000,000
Equity securities, gross unrealized loss | $ 0 $ 0  
Corporate bonds      
Schedule of Investments [Line Items]      
Fair Value | $ $ 340,000,000   $ 343,000,000
Collateralized Debt Obligations      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 180   84
Capital trust notes      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 6   6
Asset-backed securities      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 7   8
Corporate bonds      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 12   12
Provision for credit loss | $ $ 1,000,000    
US Government Agencies Debt Securities      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 39   37
Mortgage-Related Debt Securities:      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 326   302
Mutual funds and common stock      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months     1
Municipal bonds      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 1   1
Foreign notes      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 1   1
Private Collateralized Mortgage Obligations      
Schedule of Investments [Line Items]      
Number of securities continuous unrealized loss position more than twelve months 1    
Federal Home Loan Bank of New York      
Schedule of Investments [Line Items]      
Federal home loan bank stock | $ $ 1,000,000,000   $ 861,000,000
Federal Home Loan Bank of Indianapolis      
Schedule of Investments [Line Items]      
Federal home loan bank stock | $ $ 329,000,000   $ 329,000,000