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Allowance for Credit Losses on Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses        
Allowance for credit loss to loans held for investment ratio 1.75% 1.76%    
Excluding loans with government guarantees and warehouse loans, the allowance for credit losses 1.76% 1.77%    
Allowance for credit losses on loans and leases $ 1,168 $ 1,201 $ 1,215 $ 992
Total loan commitments        
Financing Receivable, Allowance for Credit Losses        
Allowance for credit losses on loans and leases $ 47 $ 50