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Loans and asset quality - Information about Past Due Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Loans $ 75,195 $ 71,570
Total past due    
Financing Receivable, Past Due [Line Items]    
Loans 109 106
Total past due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Loans 53 15
Total past due | Wealth management loans    
Financing Receivable, Past Due [Line Items]    
Loans 37 47
Total past due | Other residential mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 17 8
Total past due | Wealth management mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 2 36
30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 61 103
30 to 59 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Loans 11 15
30 to 59 Days Past Due | Wealth management loans    
Financing Receivable, Past Due [Line Items]    
Loans 37 47
30 to 59 Days Past Due | Other residential mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 13 7
30 to 59 Days Past Due | Wealth management mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 0 34
60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 48 3
60 to 89 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Loans 42 0
60 to 89 Days Past Due | Wealth management loans    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
60 to 89 Days Past Due | Other residential mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 4 1
60 to 89 Days Past Due | Wealth management mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 2 2
Equal to Greater than 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Equal to Greater than 90 Days Past Due | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Equal to Greater than 90 Days Past Due | Wealth management loans    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Equal to Greater than 90 Days Past Due | Other residential mortgages    
Financing Receivable, Past Due [Line Items]    
Loans 0 0
Equal to Greater than 90 Days Past Due | Wealth management mortgages    
Financing Receivable, Past Due [Line Items]    
Loans $ 0 $ 0