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, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 5,485 $ 3,808
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 $ 2,773 $ 1,054
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 $ 2,712 2,754
Threshold period past due for nonperforming status of financing receivables 90 days  
Consumer Portfolio Segment | Residential mortgage    
Financing Receivable, Past Due [Line Items]    
Nonperforming loans and leases $ 2,114 2,167
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 $ 8,700 $ 9,500