Loans and Related Allowance for Credit Losses, Nonaccrual Loans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 8,201	$ 7,730
Total Nonaccrual loans without related allowance for credit losses	2,619	1,947
Recognized interest income	$ 263	249
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	$ 5,266	4,618
Total Nonaccrual loans without related allowance for credit losses	731	60
Recognized interest income	78	54
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,312	763
Nonaccrual loans without related allowance for credit losses	138	2
Recognized interest income	19	29
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,879	3,771
Nonaccrual loans without related allowance for credit losses	575	41
Recognized interest income	59	25
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual lease financing	75	84
Nonaccrual lease financing without related allowance for credit losses	18	17
Recognized interest income	0	0
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,935	3,112
Nonaccrual loans without related allowance for credit losses	1,888	1,887
Recognized interest income	185	195
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,838	2,991
Nonaccrual loans without related allowance for credit losses	1,888	1,887
Recognized interest income	170	177
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Mortgage loans in process of foreclosure, amount	525	705
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	70	89
Nonaccrual loans without related allowance for credit losses	0	0
Recognized interest income	11	14
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	27	32
Nonaccrual loans without related allowance for credit losses	0	0
Recognized interest income	4	4
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	$ 383	$ 540

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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