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Asset Quality - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 101,854 $ 101,185  
Portfolio loans that have received payment, CARES Act 75    
Loan modifications and forbearance, CARES Act $ 65    
Percentage of carrying amount of our commercial nonperforming loans outstanding 62.00%    
Percentage of nonperforming loans outstanding face value 73.00%    
Percentage of loans held for sale and other nonperforming assets 80.00%    
Net reduction to interest income $ 17 27 $ 31
Commitments outstanding to lend additional funds to borrowers 15 1  
Financial receivable, modifications, subsequent default, recorded investment 5 10  
Commercial Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 70,836 71,980  
Accrued interest 113    
Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 31,018 29,205  
Accrued interest 85    
Continuing Operations | Commercial Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase (decrease) in ALLL $ (411)    
Increase (decrease) in ALLL (as a percent) (37.40%)    
Continuing Operations | Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase (decrease) in ALLL $ (154)    
Increase (decrease) in ALLL (as a percent) (29.20%)    
PPP      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 1,500    
Real estate — residential mortgage | Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 15,756 $ 9,298  
Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | loan 131 212  
Commercial Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | loan 7 7  
Nonperforming      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 454 $ 785  
Nonperforming loans on nonaccrual status with no allowance 404    
Nonperforming | Commercial Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 239 497  
Nonperforming | Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 215 288  
Nonperforming | Real estate — residential mortgage | Consumer Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 72 110  
Real estate — residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financial receivable, modifications, subsequent default, recorded investment $ 104 $ 92