Quarterly report pursuant to Section 13 or 15(d)

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

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Outstanding Loans and Leases and Allowance for Credit Losses - Modifications to Borrowers in Financial Difficulty (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Consumer real estate    
Financing Receivable, Modified [Line Items]    
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 | Residential mortgage    
Financing Receivable, Modified [Line Items]    
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 | Home equity    
Financing Receivable, Modified [Line Items]    
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
Commercial    
Financing Receivable, Modified [Line Items]    
Total 3,447 796
Total $ 1,472 $ 796
% of Total Class of Financing Receivable 0.62% 0.14%
Commercial | Term Extension    
Financing Receivable, Modified [Line Items]    
Total $ 951 $ 700
Commercial | Forbearances    
Financing Receivable, Modified [Line Items]    
Total 485 96
Commercial | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Total 36 0
Commercial | United States    
Financing Receivable, Modified [Line Items]    
Total 1,104 393
Total $ 376 $ 393
% of Total Class of Financing Receivable 0.30% 0.11%
Commercial | United States | Term Extension    
Financing Receivable, Modified [Line Items]    
Total $ 370 $ 297
Commercial | United States | Forbearances    
Financing Receivable, Modified [Line Items]    
Total 6 96
Commercial | United States | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Total 0 0
Commercial | Non United States    
Financing Receivable, Modified [Line Items]    
Total 152 104
Total $ 0 $ 104
% of Total Class of Financing Receivable 0.12% 0.08%
Commercial | Non United States | Term Extension    
Financing Receivable, Modified [Line Items]    
Total $ 0 $ 104
Commercial | Non United States | Forbearances    
Financing Receivable, Modified [Line Items]    
Total 0 0
Commercial | Non United States | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Total 0 0
Commercial | Current    
Financing Receivable, Modified [Line Items]    
Total 2,764 758
Commercial | Current | United States    
Financing Receivable, Modified [Line Items]    
Total 1,046 355
Commercial | Current | Non United States    
Financing Receivable, Modified [Line Items]    
Total 149 104
Commercial | 30–89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Total 326 0
Commercial | 30–89 Days Past Due | United States    
Financing Receivable, Modified [Line Items]    
Total 34 0
Commercial | 30–89 Days Past Due | Non United States    
Financing Receivable, Modified [Line Items]    
Total 0 0
Commercial | 90+ Days Past Due    
Financing Receivable, Modified [Line Items]    
Total 357 38
Commercial | 90+ Days Past Due | United States    
Financing Receivable, Modified [Line Items]    
Total 24 38
Commercial | 90+ Days Past Due | Non United States    
Financing Receivable, Modified [Line Items]    
Total 3 0
Commercial | Commercial real estate    
Financing Receivable, Modified [Line Items]    
Total 2,191 299
Total $ 1,096 $ 299
% of Total Class of Financing Receivable 3.06% 0.41%
Commercial | Commercial real estate | Term Extension    
Financing Receivable, Modified [Line Items]    
Total $ 581 $ 299
Commercial | Commercial real estate | Forbearances    
Financing Receivable, Modified [Line Items]    
Total 479 0
Commercial | Commercial real estate | Interest Rate Reduction    
Financing Receivable, Modified [Line Items]    
Total 36 0
Commercial | Commercial real estate | Current    
Financing Receivable, Modified [Line Items]    
Total 1,569 299
Commercial | Commercial real estate | 30–89 Days Past Due    
Financing Receivable, Modified [Line Items]    
Total 292 0
Commercial | Commercial real estate | 90+ Days Past Due    
Financing Receivable, Modified [Line Items]    
Total $ 330 $ 0