Annual report pursuant to Section 13 and 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)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Consumer real estate  
Financing Receivable, Modified [Line Items]  
Total $ 671
Consumer real estate | Current  
Financing Receivable, Modified [Line Items]  
Total 392
Consumer real estate | 30–89 Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 106
Consumer real estate | 90+ Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 173
Consumer real estate | Residential mortgage  
Financing Receivable, Modified [Line Items]  
Total 583
Consumer real estate | Residential mortgage | Current  
Financing Receivable, Modified [Line Items]  
Total 334
Consumer real estate | Residential mortgage | 30–89 Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 101
Consumer real estate | Residential mortgage | 90+ Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 148
Consumer real estate | Home equity  
Financing Receivable, Modified [Line Items]  
Total 88
Consumer real estate | Home equity | Current  
Financing Receivable, Modified [Line Items]  
Total 58
Consumer real estate | Home equity | 30–89 Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 5
Consumer real estate | Home equity | 90+ Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 25
Commercial  
Financing Receivable, Modified [Line Items]  
Total 3,278
Total $ 3,278
% of Total Class of Financing Receivable 0.59%
Commercial | Term Extension  
Financing Receivable, Modified [Line Items]  
Total $ 2,808
Commercial | Forbearances  
Financing Receivable, Modified [Line Items]  
Total 446
Commercial | Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Total 24
Commercial | United States  
Financing Receivable, Modified [Line Items]  
Total 1,046
Total $ 1,046
% of Total Class of Financing Receivable 0.29%
Commercial | United States | Term Extension  
Financing Receivable, Modified [Line Items]  
Total $ 1,016
Commercial | United States | Forbearances  
Financing Receivable, Modified [Line Items]  
Total 30
Commercial | United States | Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Total 0
Commercial | Non United States  
Financing Receivable, Modified [Line Items]  
Total 160
Total $ 160
% of Total Class of Financing Receivable 0.13%
Commercial | Non United States | Term Extension  
Financing Receivable, Modified [Line Items]  
Total $ 136
Commercial | Non United States | Forbearances  
Financing Receivable, Modified [Line Items]  
Total 0
Commercial | Non United States | Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Total 24
Commercial | Current  
Financing Receivable, Modified [Line Items]  
Total 2,780
Commercial | Current | United States  
Financing Receivable, Modified [Line Items]  
Total 1,015
Commercial | Current | Non United States  
Financing Receivable, Modified [Line Items]  
Total 157
Commercial | 30–89 Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 128
Commercial | 30–89 Days Past Due | United States  
Financing Receivable, Modified [Line Items]  
Total 3
Commercial | 30–89 Days Past Due | Non United States  
Financing Receivable, Modified [Line Items]  
Total 3
Commercial | 90+ Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 370
Commercial | 90+ Days Past Due | United States  
Financing Receivable, Modified [Line Items]  
Total 28
Commercial | 90+ Days Past Due | Non United States  
Financing Receivable, Modified [Line Items]  
Total 0
Commercial | Commercial real estate  
Financing Receivable, Modified [Line Items]  
Total 2,072
Total $ 2,072
% of Total Class of Financing Receivable 2.84%
Commercial | Commercial real estate | Term Extension  
Financing Receivable, Modified [Line Items]  
Total $ 1,656
Commercial | Commercial real estate | Forbearances  
Financing Receivable, Modified [Line Items]  
Total 416
Commercial | Commercial real estate | Interest Rate Reduction  
Financing Receivable, Modified [Line Items]  
Total 0
Commercial | Commercial real estate | Current  
Financing Receivable, Modified [Line Items]  
Total 1,608
Commercial | Commercial real estate | 30–89 Days Past Due  
Financing Receivable, Modified [Line Items]  
Total 122
Commercial | Commercial real estate | 90+ Days Past Due  
Financing Receivable, Modified [Line Items]  
Total $ 342