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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

X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147481598/310-20-45-1

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