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Loans and ACL - Summary of Loan Modifications (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.24% 0.42%  
Financing Receivable, Modified in Period, Amount $ 769 $ 1,365  
Financing Receivable, Modified, Accumulated 1,365 1,365 $ 2,200
Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 316 641  
Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 37 74  
Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 39 69  
Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 198 269  
Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 53 63  
Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 89 180  
Combination - Capitalization, Interest Rate and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 18 37  
Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 19 $ 32  
Commercial: | Commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.20% 0.34%  
Financing Receivable, Modified in Period, Amount $ 330 $ 564  
Financing Receivable, Modified, Accumulated 564 564  
Commercial: | Commercial and industrial | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 265 499  
Commercial: | Commercial and industrial | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 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 21 21  
Commercial: | Commercial and industrial | Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 44 44  
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 | Combination - Capitalization, Interest Rate 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 $ 0  
Commercial: | CRE      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.21% 0.82%  
Financing Receivable, Modified in Period, Amount $ 49 $ 187  
Financing Receivable, Modified, Accumulated 187 187  
Commercial: | CRE | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 49 139  
Commercial: | CRE | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 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 48  
Commercial: | CRE | Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | CRE | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Commercial: | CRE | Combination - Capitalization, Interest Rate 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 $ 0  
Commercial: | Commercial construction      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.03% 0.05%  
Financing Receivable, Modified in Period, Amount $ 2 $ 3  
Financing Receivable, Modified, Accumulated 3 3  
Commercial: | Commercial construction | Renewals      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 2 3  
Commercial: | Commercial construction | Term Extensions      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 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 - Interest Rate Adjustment and Term Extension      
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 | Combination - Capitalization, Interest Rate 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 0.38% 0.71%  
Financing Receivable, Modified in Period, Amount $ 213 $ 403  
Financing Receivable, Modified, Accumulated 403 403  
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 25 53  
Consumer: | Residential mortgage | Capitalizations      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 39 69  
Consumer: | Residential mortgage | Payment Delays      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 36 54  
Consumer: | Residential mortgage | Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 1 2  
Consumer: | Residential mortgage | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 89 180  
Consumer: | Residential mortgage | Combination - Capitalization, Interest Rate and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 18 37  
Consumer: | Residential mortgage | Other      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount $ 5 $ 8  
Consumer: | Home equity      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.04% 0.07%  
Financing Receivable, Modified in Period, Amount $ 4 $ 7  
Financing Receivable, Modified, Accumulated 7 7  
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 | 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 - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 3 5  
Consumer: | Home equity | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Home equity | Combination - Capitalization, Interest Rate 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 0.62% 0.69%  
Financing Receivable, Modified in Period, Amount $ 159 $ 177  
Financing Receivable, Modified, Accumulated 177 177  
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 7 12  
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 141 145  
Consumer: | Indirect auto | Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 4 9  
Consumer: | Indirect auto | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Indirect auto | Combination - Capitalization, Interest Rate 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 $ 7 $ 11  
Consumer: | Other consumer      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.02% 0.05%  
Financing Receivable, Modified in Period, Amount $ 7 $ 15  
Financing Receivable, Modified, Accumulated 15 15  
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 5 9  
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 1  
Consumer: | Other consumer | Combination - Interest Rate Adjustment and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 1 3  
Consumer: | Other consumer | Combination - Capitalization and Term Extension      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, Amount 0 0  
Consumer: | Other consumer | Combination - Capitalization, Interest Rate 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 $ 2  
Credit card      
Financing Receivable, Modifications [Line Items]      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.10% 0.19%  
Financing Receivable, Modified in Period, Amount $ 5 $ 9  
Financing Receivable, Modified, Accumulated 9 9  
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 | 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 - Interest Rate Adjustment and Term Extension      
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 | Combination - Capitalization, Interest Rate 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 $ 5 $ 9