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	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modified [Line Items]
FDMs	$ 49	$ 923	$ 196	$ 977
Weighted-average term loan extensions	20 years	15 years	19 years	16 years
Weighted average contractual interest rate before modification	7.33%	7.17%	7.36%	7.25%
Weighted average contractual interest rate after modification	6.74%	5.65%	6.70%	5.82%
Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
FDMs	$ 23	$ 887	$ 152	$ 902

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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