v3.25.2
Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Financial assets      
HTM $ 1,540.0 $ 1,526.0  
AFS 16,898.0 13,468.0  
Investment securities - Trading, at fair value 53.0 0.0  
Investment securities - equity 122.0 117.0  
Derivative asset 389.0 253.0 $ 244.0
Loans HFS 3,022.0 2,286.0  
Net loans HFI 55,544.0 53,302.0  
Mortgage servicing rights 1,044.0 1,127.0  
Accrued interest receivable 5.0 5.0  
Financial liabilities      
Total deposits 71,107.0 66,341.0  
Other borrowings 6,052.0 5,573.0  
Junior subordinated debt 69.0 65.0  
Derivative liabilities 28.0 27.0 $ 28.0
Fair Value, Nonrecurring | Carrying Amount      
Financial assets      
HTM 1,540.0 1,526.0  
Net loans HFI 55,544.0 53,302.0  
Accrued interest receivable 426.0 362.0  
Financial liabilities      
Total deposits 71,107.0 66,341.0  
Other borrowings 6,052.0 5,573.0  
Junior subordinated debt 678.0 899.0  
Accrued interest payable 132.0 138.0  
Fair Value, Nonrecurring | Estimate of Fair Value Measurement      
Financial assets      
HTM 1,368.0 1,309.0  
Net loans HFI 55,443.0 53,070.0  
Accrued interest receivable 426.0 362.0  
Financial liabilities      
Total deposits 71,143.0 66,393.0  
Other borrowings 6,032.0 5,545.0  
Junior subordinated debt 641.0 867.0  
Accrued interest payable 132.0 138.0  
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
HTM 0.0 0.0  
Net loans HFI 0.0 0.0  
Accrued interest receivable 0.0 0.0  
Financial liabilities      
Total deposits 0.0 0.0  
Other borrowings 0.0 0.0  
Junior subordinated debt 0.0 0.0  
Accrued interest payable 0.0 0.0  
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)      
Financial assets      
HTM 1,368.0 1,309.0  
Net loans HFI 0.0 0.0  
Accrued interest receivable 426.0 362.0  
Financial liabilities      
Total deposits 71,143.0 66,393.0  
Other borrowings 6,032.0 5,545.0  
Junior subordinated debt 556.0 789.0  
Accrued interest payable 132.0 138.0  
Fair Value, Nonrecurring | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)      
Financial assets      
HTM 0.0 0.0  
Net loans HFI 55,443.0 53,070.0  
Accrued interest receivable 0.0 0.0  
Financial liabilities      
Total deposits 0.0 0.0  
Other borrowings 0.0 0.0  
Junior subordinated debt 85.0 78.0  
Accrued interest payable 0.0 0.0  
Fair Value, Recurring      
Financial assets      
AFS 16,898.0 13,468.0  
Investment securities - Trading, at fair value 53.0    
Investment securities - equity 122.0 117.0  
Derivative asset 176.0 233.0  
Financial liabilities      
Derivative liabilities 203.0 76.0  
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
AFS 5,532.0 4,385.0  
Investment securities - Trading, at fair value 0.0    
Investment securities - equity 122.0 117.0  
Derivative asset 0.0 0.0  
Financial liabilities      
Junior subordinated debt 0.0 0.0  
Derivative liabilities 0.0 0.0  
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)      
Financial assets      
AFS 11,366.0 9,083.0  
Investment securities - Trading, at fair value 53.0    
Investment securities - equity 0.0 0.0  
Derivative asset 119.0 198.0  
Financial liabilities      
Junior subordinated debt 0.0 0.0  
Derivative liabilities 203.0 69.0  
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)      
Financial assets      
AFS 0.0 0.0  
Investment securities - Trading, at fair value 0.0    
Investment securities - equity 0.0 0.0  
Derivative asset 57.0 35.0  
Financial liabilities      
Junior subordinated debt 69.0 65.0  
Derivative liabilities 0.0 7.0  
Fair Value, Recurring | Carrying Amount      
Financial assets      
AFS 16,898.0 13,468.0  
Investment securities - Trading, at fair value 53.0    
Investment securities - equity 122.0 117.0  
Derivative asset 176.0 233.0  
Loans HFS 3,022.0 2,286.0  
Mortgage servicing rights 1,044.0 1,127.0  
Financial liabilities      
Derivative liabilities 203.0 76.0  
Fair Value, Recurring | Estimate of Fair Value Measurement      
Financial assets      
AFS 16,898.0 13,468.0  
Investment securities - Trading, at fair value 53.0    
Investment securities - equity 122.0 117.0  
Derivative asset 176.0 233.0  
Loans HFS 3,022.0 2,286.0  
Mortgage servicing rights 1,044.0 1,127.0  
Financial liabilities      
Derivative liabilities 203.0 76.0  
Fair Value, Recurring | Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial assets      
AFS 5,532.0 4,385.0  
Investment securities - Trading, at fair value 0.0    
Investment securities - equity 122.0 117.0  
Derivative asset 0.0 0.0  
Loans HFS 0.0 0.0  
Mortgage servicing rights 0.0 0.0  
Financial liabilities      
Derivative liabilities 0.0 0.0  
Fair Value, Recurring | Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)      
Financial assets      
AFS 11,366.0 9,083.0  
Investment securities - Trading, at fair value 53.0    
Investment securities - equity 0.0 0.0  
Derivative asset 119.0 198.0  
Loans HFS 2,913.0 2,259.0  
Mortgage servicing rights 0.0 0.0  
Financial liabilities      
Derivative liabilities 203.0 69.0  
Fair Value, Recurring | Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)      
Financial assets      
AFS 0.0 0.0  
Investment securities - Trading, at fair value 0.0    
Investment securities - equity 0.0 0.0  
Derivative asset 57.0 35.0  
Loans HFS 109.0 27.0  
Mortgage servicing rights 1,044.0 1,127.0  
Financial liabilities      
Derivative liabilities $ 0.0 $ 7.0