v3.26.1
Loans and Allowance for Loan Losses - Schedule of Amortized Cost of FDM Loans by Loan Portfolio Class (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 45 $ 5
Percentage of Total by Financing Class 0.10% 0.00%
Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0 $ 0
Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 9 5
Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 36 0
Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0 0
Total commercial and industrial    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 33 $ 5
Percentage of Total by Financing Class 0.10% 0.00%
Total commercial and industrial | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0 $ 0
Total commercial and industrial | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 8 5
Total commercial and industrial | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 25 0
Total commercial and industrial | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0 0
Total commercial and industrial | Commercial, financial and agricultural    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 33 $ 5
Percentage of Total by Financing Class 0.10% 0.00%
Total commercial and industrial | Commercial, financial and agricultural | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0 $ 0
Total commercial and industrial | Commercial, financial and agricultural | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 8 5
Total commercial and industrial | Commercial, financial and agricultural | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 25 0
Total commercial and industrial | Commercial, financial and agricultural | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0
Total commercial and industrial | Owner-occupied    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Percentage of Total by Financing Class 0.00%  
Total commercial and industrial | Owner-occupied | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total commercial and industrial | Owner-occupied | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified  
Total commercial and industrial | Owner-occupied | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total commercial and industrial | Owner-occupied | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total commercial real estate    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 9  
Percentage of Total by Financing Class 0.00%  
Total commercial real estate | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total commercial real estate | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total commercial real estate | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 9  
Total commercial real estate | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total commercial real estate | Investment properties    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 9  
Percentage of Total by Financing Class 0.00%  
Total commercial real estate | Investment properties | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total commercial real estate | Investment properties | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified  
Total commercial real estate | Investment properties | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 9  
Total commercial real estate | Investment properties | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total consumer    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 3  
Percentage of Total by Financing Class 0.00%  
Total consumer | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total consumer | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 1  
Total consumer | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 2  
Total consumer | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total consumer | Consumer mortgages    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 2  
Percentage of Total by Financing Class 0.00%  
Total consumer | Consumer mortgages | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total consumer | Consumer mortgages | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total consumer | Consumer mortgages | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 2  
Total consumer | Consumer mortgages | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total consumer | Other consumer loans    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 1  
Percentage of Total by Financing Class 0.10%  
Total consumer | Other consumer loans | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0  
Total consumer | Other consumer loans | Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 1  
Total consumer | Other consumer loans | Payment Delay    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified 0  
Total consumer | Other consumer loans | Interest Rate Reduction and Term Extension    
Financing Receivable, Modified [Line Items]    
Amortized cost of loans, modified $ 0