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Investment Securities - Investment Securities, Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
loan
Jun. 30, 2022
USD ($)
Mar. 12, 2023
USD ($)
Dec. 31, 2022
USD ($)
loan
Schedule of Investments [Line Items]          
Federal home loan bank stock | $   $ 1,136     $ 1,267
Federal reserve bank stock | $   203     176
Equity securities, FV-NI, gain (loss) | $   (1) $ (1)    
Debt securities, available-for-sale | $   $ 7,782     $ 9,060
Signature Bank | Corporate bonds          
Schedule of Investments [Line Items]          
Debt securities, available-for-sale | $       $ 20  
Collateralized Debt Obligations          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   59     23
Capital trust notes          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   6     5
Asset-backed securities          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   9     7
Corporate bonds          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   10     2
Corporate bonds | Signature Bank          
Schedule of Investments [Line Items]          
Provision for credit loss | $ $ 20        
US Government Agencies Debt Securities          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   38     33
Agency - commercial          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   249     133
Mutual funds and common stock          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   1     1
Municipal bonds          
Schedule of Investments [Line Items]          
Number of securities continuous unrealized loss position more than twelve months | loan   1     1
Federal Home Loan Bank of New York          
Schedule of Investments [Line Items]          
Federal home loan bank stock | $   $ 605     $ 762
Federal Home Loan Bank of Indianapolis          
Schedule of Investments [Line Items]          
Federal home loan bank stock | $   $ 329     $ 329