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Loans and asset quality - Credit Risk Indicators Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of exposure to investment grade securities | 96.00% |
Percentage of financial institution exposure secured | 66.00% |
Percent of financial institution exposure expiring within one year | 82.00% |
Loans | $ 75,195,000,000 | $ 71,570,000,000
Reverse repurchase agreements, allowance for credit loss | $ 0 | 0
Wealth management mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan to value ratio at origination (percent) | 61.00% |
Loans | $ 8,707,000,000 | 8,950,000,000
Wealth management mortgages | California | Geographic Concentration Risk | Revenue Benchmark |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Geographic concentrations (percent) | 20.00% |
Wealth management mortgages | New York | Geographic Concentration Risk | Revenue Benchmark |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Geographic concentrations (percent) | 14.00% |
Wealth management mortgages | Florida | Geographic Concentration Risk | Revenue Benchmark |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Geographic concentrations (percent) | 11.00% |
Wealth management mortgages | Massachusetts | Geographic Concentration Risk | Revenue Benchmark |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Geographic concentrations (percent) | 8.00% |
Wealth management mortgages | Other | Geographic Concentration Risk | Revenue Benchmark |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Geographic concentrations (percent) | 47.00% |
Total wealth management loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of past due mortgages (less than) | 1.00% |
Other residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 1,767,000,000 | 1,068,000,000
Margin loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 23,084,000,000 | 19,137,000,000
Minimum collateral margin | 1 |
Overdrafts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 2,700,000,000 |
Overdrafts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 2,652,000,000 | $ 3,519,000,000
Overdraft repayment period | 2 days | 2 days

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