Loans and Related Allowance for Credit Losses, Nonaccrual Loans (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonaccrual loans	$ 7,643		$ 8,201
Total Nonaccrual loans without related allowance for credit losses	2,269		2,619
Recognized interest income	$ 112	$ 141
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	$ 4,735		5,266
Total Nonaccrual loans without related allowance for credit losses	450		731
Recognized interest income	28	49
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,248		1,312
Nonaccrual loans without related allowance for credit losses	13		138
Recognized interest income	12	12
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,402		3,879
Nonaccrual loans without related allowance for credit losses	418		575
Recognized interest income	16	37
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual lease financing	85		75
Nonaccrual lease financing without related allowance for credit losses	19		18
Recognized interest income	0	0
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,908		2,935
Nonaccrual loans without related allowance for credit losses	1,819		1,888
Recognized interest income	84	92
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	2,811		2,838
Nonaccrual loans without related allowance for credit losses	1,819		1,888
Recognized interest income	77	84
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Mortgage loans in process of foreclosure, amount	435		525
Total Consumer [Member] \| Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	72		70
Nonaccrual loans without related allowance for credit losses	0		0
Recognized interest income	5	6
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	25		27
Nonaccrual loans without related allowance for credit losses	0		0
Recognized interest income	2	$ 2
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	$ 335		$ 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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