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Investment Securities - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
security
Schedule of Investments [Line Items]          
Federal home loan bank stock | $ $ 1,364,000,000   $ 1,364,000,000   $ 1,392,000,000
Federal reserve bank stock | $ 219,000,000   219,000,000   $ 203,000,000
Gross realized gains | $ 0   1,000,000    
Gross realized losses | $ $ 0   $ 1,000,000    
Available-for-sale securities sold | $   $ 0   $ 0  
Collateralized Debt Obligations          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 222   222   84
Capital trust notes          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 5   5   6
Asset-backed securities          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 5   5   8
Corporate bonds          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 12   12   12
US Government Agencies Debt Securities          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 33   33   37
Mortgage-Related Debt Securities:          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 328   328   302
Mutual funds and common stock          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 1   1   1
Municipal bonds          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 1   1   1
Foreign notes          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 1   1   1
Private Collateralized Mortgage Obligations          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months 2   2    
Federal Home Loan Bank of New York          
Schedule of Investments [Line Items]          
Federal home loan bank stock | $ $ 816,000,000   $ 816,000,000   $ 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   $ 329,000,000