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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	6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,031,115	$ 924,418	$ 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	$ 636,299		$ 599,895
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	22	32
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	487,630		452,068
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	132,986		132,284
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,683		15,543
Total Commercial [Member] \| Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	86,883		86,647
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	81,438		80,475
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,975		5,674
Total Commercial [Member] \| Non-U.S. [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	470		498
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	394,816		386,272
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	188	$ 197
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	240,774		242,190
Total Consumer [Member] \| Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	58,394		59,540
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	56,924		50,487
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,724		34,055
Total Consumer [Member] \| Other consumer [Member] \| Securities based lending loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 32,200		$ 26,200