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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, before allowance for credit loss, of net investment in sales-type and direct financing leases.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Loans and Related Allowance for Credit Losses, Loans Outstanding (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,016,787	$ 913,842	$ 986,167
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Deferred income as a percentage of total loans outstanding	1.00%		1.00%
Financing receivable, practical expedient, accrued interest exclusion [true false]	true		true
Financing receivable, accounting policy election, accrued interest writeoff method [Fixed List]	Reversing interest income		Reversing interest income
Net investment in lease, accounting policy election, accrued interest writeoff method [Fixed List]	Reversing interest income		Reversing interest income
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 629,640		$ 599,895
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	10	19
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	481,915		452,068
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	132,213		132,284
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,512		15,543
Total Commercial [Member] \| Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	87,952		86,647
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	82,677		80,475
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,792		5,674
Total Commercial [Member] \| Non-U.S. [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	483		498
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	387,147		386,272
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	96	$ 102
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	240,839		242,190
Total Consumer [Member] \| Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,277		59,540
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	53,794		50,487
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	35,237		34,055
Total Consumer [Member] \| Other consumer [Member] \| Securities based lending loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 28,500		$ 26,200