Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Modifications to Borrowers in Financial Difficulty and Financial Effect of Modified Loans (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Modifications to Borrowers in Financial Difficulty and Financial Effect of Modified Loans (Details) - Consumer real estate - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Modified [Line Items]        
Total $ 105 $ 370 $ 182 $ 507
Forbearance and Other Payment Plans        
Financing Receivable, Modified [Line Items]        
Total 22 317 38 401
Permanent Modification        
Financing Receivable, Modified [Line Items]        
Total 83 53 144 106
Residential Mortgage        
Financing Receivable, Modified [Line Items]        
Total 95 320 164 436
Residential Mortgage | Forbearance and Other Payment Plans        
Financing Receivable, Modified [Line Items]        
Total $ 22 $ 276 $ 38 $ 348
Weighted-average duration 5 months 6 months 7 months 8 months
Residential Mortgage | Permanent Modification        
Financing Receivable, Modified [Line Items]        
Total $ 73 $ 44 $ 126 $ 88
Weighted-average duration 9 years 2 months 12 days 10 years 2 months 12 days 9 years 1 month 6 days 8 years 7 months 6 days
Weighted-average Interest Rate Reduction 1.34% 1.62% 1.32% 1.57%
Home equity        
Financing Receivable, Modified [Line Items]        
Total $ 10 $ 50 $ 18 $ 71
Home equity | Forbearance and Other Payment Plans        
Financing Receivable, Modified [Line Items]        
Total 0 $ 41 0 $ 53
Weighted-average duration   6 months   9 months
Home equity | Permanent Modification        
Financing Receivable, Modified [Line Items]        
Total $ 10 $ 9 $ 18 $ 18
Weighted-average duration 18 years 4 months 24 days 16 years 10 months 24 days 17 years 4 months 24 days 15 years 2 months 12 days
Weighted-average Interest Rate Reduction 2.42% 2.96% 2.60% 2.69%