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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

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