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Loans - Summary of Subsequently Delinquent Loans With Payment Modifications (Details) - 90+ Days - Commercial loans
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default $ 166
Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 0
Principal Forgiveness  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 0
Term Extension / Significant Payment Deferral  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 166
Combination  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 0
Real estate, including construction  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 166
Real estate, including construction | Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 0
Real estate, including construction | Principal Forgiveness  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 0
Real estate, including construction | Term Extension / Significant Payment Deferral  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default 166
Real estate, including construction | Combination  
Financing Receivable, Modified [Line Items]  
Loans modified, subsequently default $ 0