Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Nonperforming, Narrative (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Nonperforming, Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 4,952 $ 3,552
Purchased credit-impaired loans $ 144  
Threshold period past due for nonperforming status of financing receivables 90 days 90 days
Commercial    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 2,227 $ 1,499
Threshold period past due for nonperforming status of financing receivables 90 days  
Consumer Portfolio Segment    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 2,725 2,053
Consumer Portfolio Segment | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 2,005 1,470
Consumer Portfolio Segment | Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 127  
Consumer Portfolio Segment | Home equity lines of credit    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 649 536
Consumer Portfolio Segment | Home equity lines of credit | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 17  
Federal National Mortgage Association Certificates and Obligations (FNMA) and Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Long-term credit protection agreements, amount covered $ 9,000 $ 7,500