Quarterly report pursuant to Section 13 or 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
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 5,162 $ 4,952
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 $ 2,071 $ 2,227
Consumer Portfolio Segment    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 3,091 2,725
Consumer Portfolio Segment | Residential Mortgage    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases 2,366 2,005
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 $ 9,400 $ 9,000