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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses      
Cash and cash equivalents $ 11,475,000,000 $ 2,032,000,000  
Interest-bearing deposits 10,700,000,000 837,000,000  
Securities reverse repurchase 0 793,000,000  
Federal funds sold 0 0  
Restricted cash $ 134,000,000 $ 50,000,000  
Percent of loans held for investment 100.00% 100.00%  
Goodwill impairment $ 2,426,000,000 $ 0 $ 0
Depreciation 39,000,000 18,000,000 21,000,000
Investment in BOLI 1,580,000,000 1,561,000,000  
Bank-owned life insurance 43,000,000 32,000,000 $ 29,000,000
LGG loans, repossessed assets 14,000,000    
Guarantees, fair value 12,000,000 10,000,000  
Accumulated depreciation (526,000,000) (434,000,000)  
Taxi medallions 4,000,000 4,000,000  
Other repossessed assets 5,000,000    
OREO $ 5,000,000 $ 8,000,000  
Options available for future grants (in shares) 16,143,893    
Premises      
Financing Receivable, Allowance for Credit Losses      
Estimated useful lives 20 years    
Furniture, fixtures and equipment, and building improvements      
Financing Receivable, Allowance for Credit Losses      
Estimated useful lives 13 years 6 months    
Furniture, fixtures and equipment, and building improvements | Minimum      
Financing Receivable, Allowance for Credit Losses      
Estimated useful lives 3 years    
Furniture, fixtures and equipment, and building improvements | Maximum      
Financing Receivable, Allowance for Credit Losses      
Estimated useful lives 10 years    
Total loan commitments      
Financing Receivable, Allowance for Credit Losses      
Percent of loans held for investment 60.00%