Loans and Related Allowance for Credit Losses, Nonaccrual Loans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 8,469		$ 8,201
Total Nonaccrual loans without related allowance for credit losses	2,241		2,619
Recognized interest income	$ 51	$ 76
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, residential mortgage, delinquency before foreclosure commencement, period	120 days
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 5,513		5,266
Total Nonaccrual loans without related allowance for credit losses	391		731
Recognized interest income	9	32
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,646		1,312
Nonaccrual loans without related allowance for credit losses	65		138
Recognized interest income	3	5
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,779		3,879
Nonaccrual loans without related allowance for credit losses	305		575
Recognized interest income	6	27
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual lease financing	88		75
Nonaccrual lease financing without related allowance for credit losses	21		18
Recognized interest income	0	0
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,956		2,935
Nonaccrual loans without related allowance for credit losses	1,850		1,888
Recognized interest income	42	44
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,860		2,838
Nonaccrual loans without related allowance for credit losses	1,850		1,888
Recognized interest income	38	40
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Mortgage loans in process of foreclosure, amount	462		525
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	70		70
Nonaccrual loans without related allowance for credit losses	0		0
Recognized interest income	3	3
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	26		27
Nonaccrual loans without related allowance for credit losses	0		0
Recognized interest income	1	$ 1
Total Consumer [Member] \| Government guaranteed mortgage loans upon foreclosure receivable [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Mortgage loans in process of foreclosure, amount	$ 355		$ 383

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-Topic 310
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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