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Asset Quality - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
SecurityLoan
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
SecurityLoan
Sep. 30, 2021
USD ($)
SecurityLoan
Sep. 30, 2020
USD ($)
SecurityLoan
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income (residential) $ 98,609     $ 98,609   $ 101,185
Loans that have received payment deferral or forbearance, CARES Act       174    
Loan modifications and forbearance, CARES Act       124    
Accrued interest $ 211     $ 211   241
Percentage of carrying amount of our commercial nonperforming loans outstanding 62.00%     62.00%    
Percentage of nonperforming loans outstanding face value 72.00%     72.00%    
Percentage of loans held for sale and other nonperforming assets 77.00%     77.00%    
Net reduction to interest income $ 6   $ 7 $ 20 $ 20  
Commitments outstanding to lend additional funds to borrowers (less than $1 million) 21     21   1
Financial receivable, modifications, subsequent default, recorded investment 2   $ 1 4 $ 4  
Commercial Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest $ 117     $ 117   140
TDRs, period for default       90 days    
Number of loans | SecurityLoan 2   0 5 0  
Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest $ 95     $ 95   $ 101
TDRs, period for default       60 days    
Number of loans | SecurityLoan 33   33 98 160  
Continuing operations | Commercial Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Decrease in ALLL $ (90)          
Decrease in ALLL (as a percent) (11.30%)          
Continuing operations | Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Decrease in ALLL $ (46)          
Decrease in ALLL (as a percent) (10.80%)          
PPP            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income (residential) $ 3,100     $ 3,100    
Nonperforming financial instruments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Nonperforming loans on nonaccrual status with no allowance $ 492     492    
Real estate — residential mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financial receivable, modifications, subsequent default, recorded investment   $ 92   $ 70