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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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Amount of decrease from sale of net investment in sales-type and direct financing leases.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans, as a percentage of total loans and leases receivable, net.

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Loans and Related Allowance for Credit Losses, Loans Outstanding (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2026	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing		$ 15,543	$ 16,413
Total loans		$ 986,167	$ 912,745
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
Railroad transportation equipment [Member] \| Subsequent Event [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Net investment in lease, sale	$ 1,000
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 599,895	$ 534,159
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff		47	41
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		452,068	381,241
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		132,284	136,505
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing		15,543	16,413
Total Commercial [Member] \| Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		86,647	67,759
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		80,475	62,038
Total Commercial [Member] \| Non-U.S. [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		5,674	5,123
Total Commercial [Member] \| Non-U.S. [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing		498	598
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		386,272	378,586
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff		376	401
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		242,190	250,269
Total Consumer [Member] \| Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		59,540	56,542
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		50,487	42,367
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		34,055	29,408
Total Consumer [Member] \| Other consumer [Member] \| Securities based lending loans [Member] \| Wealth Management [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 26,200	$ 21,400