Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Loan Modifications to Borrowers in Financial Difficulty, Narrative (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Loan Modifications to Borrowers in Financial Difficulty, Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Trial Modifications | Minimum      
Financing Receivable, Modified [Line Items]      
Term for contractual payments 3 months    
Trial Modifications | Maximum      
Financing Receivable, Modified [Line Items]      
Term for contractual payments 4 months    
Consumer real estate      
Financing Receivable, Modified [Line Items]      
Real estate acquired through foreclosure $ 90   $ 83
Loans with formal foreclosure proceeding in process 627   $ 633
Reclassified consumer real estate loans 30 $ 37  
Total 547 245  
Consumer real estate | Current      
Financing Receivable, Modified [Line Items]      
Total 355 149  
Consumer real estate | 30–89 Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 84 56  
Consumer real estate | 90+ Days Past Due      
Financing Receivable, Modified [Line Items]      
Total $ 108 $ 40  
Consumer real estate | Forbearance And Other Payment Plans      
Financing Receivable, Modified [Line Items]      
Increase of weighted-average life of impacted loans 3 months 9 months  
Consumer real estate | Residential Mortgage And Home Equity Loan | Permanent Modifications      
Financing Receivable, Modified [Line Items]      
Modified term 30 years    
Consumer real estate | Residential Mortgage      
Financing Receivable, Modified [Line Items]      
Percentage of outstanding loans 0.03% 0.09%  
Total $ 476 $ 205  
Consumer real estate | Residential Mortgage | Current      
Financing Receivable, Modified [Line Items]      
Total 304 126  
Consumer real estate | Residential Mortgage | 30–89 Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 78 49  
Consumer real estate | Residential Mortgage | 90+ Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 94 30  
Consumer real estate | Residential Mortgage | Forbearance And Other Payment Plans      
Financing Receivable, Modified [Line Items]      
Total 20 158  
Consumer real estate | Residential Mortgage | Trial Modifications      
Financing Receivable, Modified [Line Items]      
Total 53 21  
Consumer real estate | Residential Mortgage | Permanent Modifications      
Financing Receivable, Modified [Line Items]      
Total $ 58 $ 47  
Increase of weighted-average life of impacted loans 9 years 3 months 18 days 7 years 8 months 12 days  
Weighted average interest rate reduction 1.28% 1.50%  
Consumer real estate | Residential Mortgage | Permanent Modifications | Minimum      
Financing Receivable, Modified [Line Items]      
Modified term 1 year    
Consumer real estate | Residential Mortgage | Permanent Modifications | Maximum      
Financing Receivable, Modified [Line Items]      
Modified term 20 years    
Consumer real estate | Home equity      
Financing Receivable, Modified [Line Items]      
Percentage of outstanding loans 0.04% 0.15%  
Total $ 71 $ 40  
Consumer real estate | Home equity | Current      
Financing Receivable, Modified [Line Items]      
Total 51 23  
Consumer real estate | Home equity | 30–89 Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 6 7  
Consumer real estate | Home equity | 90+ Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 14 10  
Consumer real estate | Home equity | Forbearance And Other Payment Plans      
Financing Receivable, Modified [Line Items]      
Total 0 30  
Consumer real estate | Home equity | Trial Modifications      
Financing Receivable, Modified [Line Items]      
Total 9 9  
Consumer real estate | Home equity | Permanent Modifications      
Financing Receivable, Modified [Line Items]      
Total $ 9 $ 10  
Increase of weighted-average life of impacted loans 16 years 12 years 1 month 6 days  
Weighted average interest rate reduction 2.84% 2.37%  
Consumer real estate | Home equity | Permanent Modifications | Minimum      
Financing Receivable, Modified [Line Items]      
Modified term 1 year    
Consumer real estate | Home equity | Permanent Modifications | Maximum      
Financing Receivable, Modified [Line Items]      
Modified term 20 years    
Credit card and other consumer      
Financing Receivable, Modified [Line Items]      
Percentage of outstanding loans 0.11% 0.08%  
Total $ 231 $ 157  
Weighted average interest rate reduction 19.80% 18.65%  
Total $ 658 $ 157  
Credit card and other consumer | Current      
Financing Receivable, Modified [Line Items]      
Total 537 109  
Credit card and other consumer | 30–89 Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 62 24  
Credit card and other consumer | 90+ Days Past Due      
Financing Receivable, Modified [Line Items]      
Total $ 59 24  
Credit card and other consumer | Interest Rate Reduction      
Financing Receivable, Modified [Line Items]      
Term for contractual payments 60 months    
Credit card and other consumer | Interest Rate Reduction | Minimum      
Financing Receivable, Modified [Line Items]      
Term for contractual payments 6 months    
Credit card and other consumer | Interest Rate Reduction | Maximum      
Financing Receivable, Modified [Line Items]      
Term for contractual payments 72 months    
Credit card and other consumer | Principal Forgiveness      
Financing Receivable, Modified [Line Items]      
Total $ 28 11  
Commercial      
Financing Receivable, Modified [Line Items]      
Total $ 1,472 $ 796  
Weighted average interest rate reduction 0.16% 0.00%  
Total $ 3,447 $ 796  
Commercial | Current      
Financing Receivable, Modified [Line Items]      
Total 2,764 758  
Commercial | 30–89 Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 326 0  
Commercial | 90+ Days Past Due      
Financing Receivable, Modified [Line Items]      
Total 357 38  
Commercial | Interest Rate Reduction      
Financing Receivable, Modified [Line Items]      
Total 36 0  
Commercial | Payment Deferral      
Financing Receivable, Modified [Line Items]      
Total $ 485 $ 96  
Commercial | Commercial loans      
Financing Receivable, Modified [Line Items]      
Increase of weighted-average life of impacted loans 1 year 3 months 18 days 1 year 3 months 18 days  
Lending commitments $ 717 $ 534  
Commercial | Commercial loans | Payment Deferral | Minimum      
Financing Receivable, Modified [Line Items]      
Increase of weighted-average life of impacted loans 8 months    
Commercial | Commercial loans | Payment Deferral | Maximum      
Financing Receivable, Modified [Line Items]      
Increase of weighted-average life of impacted loans 24 months