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Loans and asset quality - Loan Distribution and Industry Concentrations (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 75,195 | $ 71,570
Unearned income on lease financings | 94 | 230
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,333 | 1,420
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 6,767 | 6,782
Financial institutions |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 13,038 | 13,167
Lease financings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 93 | 603
Wealth management loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 9,180 | 8,698
Wealth management mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 8,707 | 8,950
Other residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,767 | 1,068
Capital call financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 4,990 | 5,163
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 3,584 | 3,063
Overdrafts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 2,652 | 3,519
Margin loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 23,084 | $ 19,137

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