v3.25.1
Loans and ACL - Summary of Loan Modifications (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.47% 0.35%  
Financing Receivable, Modified in Period, Amount $ 1,439 $ 1,090  
Financing Receivable, Modified, Accumulated 3,521   $ 3,257
Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 544 354  
Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 33 34  
Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 8    
Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 34 13  
Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 706 576  
Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 83 55  
Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 31 $ 58  
Commercial: | Commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.21% 0.10%  
Financing Receivable, Modified in Period, Amount $ 329 $ 158  
Financing Receivable, Modified, Accumulated 1,018   1,036
Commercial: | Commercial and industrial | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 283 142  
Commercial: | Commercial and industrial | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial and industrial | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Commercial: | Commercial and industrial | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial and industrial | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 46 1  
Commercial: | Commercial and industrial | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial and industrial | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 0 $ 15  
Commercial: | CRE      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 1.14% 0.86%  
Financing Receivable, Modified in Period, Amount $ 223 $ 190  
Financing Receivable, Modified, Accumulated 447   323
Commercial: | CRE | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 223 167  
Commercial: | CRE | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | CRE | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Commercial: | CRE | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | CRE | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 10  
Commercial: | CRE | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | CRE | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 0 $ 13  
Commercial: | Commercial construction      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.43% 0.60%  
Financing Receivable, Modified in Period, Amount $ 38 $ 45  
Financing Receivable, Modified, Accumulated 108   79
Commercial: | Commercial construction | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 38 45  
Commercial: | Commercial construction | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial construction | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Commercial: | Commercial construction | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial construction | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial construction | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | Commercial construction | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 0 $ 0  
Consumer: | Residential mortgage      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.34% 0.21%  
Financing Receivable, Modified in Period, Amount $ 193 $ 113  
Financing Receivable, Modified, Accumulated 571   476
Consumer: | Residential mortgage | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Residential mortgage | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 19 19  
Consumer: | Residential mortgage | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Consumer: | Residential mortgage | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 34 13  
Consumer: | Residential mortgage | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 36 16  
Consumer: | Residential mortgage | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 83 55  
Consumer: | Residential mortgage | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 21 $ 10  
Consumer: | Home equity      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.02%  
Financing Receivable, Modified in Period, Amount $ 1 $ 2  
Financing Receivable, Modified, Accumulated 5   9
Consumer: | Home equity | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Consumer: | Home equity | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 1 $ 2  
Consumer: | Indirect auto      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 2.70% 2.54%  
Financing Receivable, Modified in Period, Amount $ 637 $ 562  
Financing Receivable, Modified, Accumulated 1,313   1,273
Consumer: | Indirect auto | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Indirect auto | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 5 6  
Consumer: | Indirect auto | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Consumer: | Indirect auto | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Indirect auto | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 624 549  
Consumer: | Indirect auto | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Indirect auto | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 8 $ 7  
Consumer: | Other consumer      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.03% 0.04%  
Financing Receivable, Modified in Period, Amount $ 10 $ 10  
Financing Receivable, Modified, Accumulated 34   36
Consumer: | Other consumer | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Other consumer | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 9 9  
Consumer: | Other consumer | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0    
Consumer: | Other consumer | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Other consumer | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Other consumer | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Other consumer | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 1 $ 1  
Credit card      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.17% 0.20%  
Financing Receivable, Modified in Period, Amount $ 8 $ 10  
Financing Receivable, Modified, Accumulated 25   $ 25
Credit card | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Credit card | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Credit card | Contractual Interest Rate Adjustments      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 8    
Credit card | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Credit card | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Credit card | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Credit card | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 0 $ 10