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Loans and asset quality - Loan Modifications (Details) $ in Millions	3 Months Ended
	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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Financing Receivable, Number Of Contracts Modified

+ References

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- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

+ References

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-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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