Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Financial Effect of FDMs (Details) - Consumer, excluding credit card - Residential real estate - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Financing Receivable, Modified [Line Items]
FDMs	$ 140	$ 135	$ 278	$ 1,000
Weighted-average term loan extensions	24 years	17 years	21 years	17 years
Weighted average contractual interest rate before modification	6.99%	7.16%	7.22%	7.09%
Weighted average contractual interest rate after modification	5.35%	6.53%	6.17%	6.15%
Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs	$ 116	$ 77	$ 213	$ 894

Financing Receivable, Modified, Weighted-Average Interest Rate After Modification, During Period

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- Definition

Financing Receivable, Modified, Weighted-Average Interest Rate Before Modification, During Period

+ References

No definition available.

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- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Period of increase in weighted-average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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