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Loans and asset quality - Loan Modifications (Details) $ in Millions | 3 Months Ended
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Sep. 30, 2025 USD ($) loan | Sep. 30, 2024 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loans modified after 12 months | $ 1 |
Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loans modified | loan | 1 | 1
Outstanding recorded investment Post- modification | $ 123 | $ 42
Other residential mortgages |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of loans modified | loan | 1 | 1
Outstanding recorded investment Post- modification | $ 1 | $ 1

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